Compare two common types of antacids. A CVS Health brand antacid liquid contains 200 mg of Al(OH)3 and 200 mg of Mg(OH)2 per dose. In comparison, Rolaids Extra Strength contains 270 mg of CaCO3 and 55 mg of Mg(OH)2 per dose. The active antacid components are OH− and CO2−3. Which antacid do you believe is more effective at neutralizing stomach acid per dose? Why?

The measurement of 0.03412 kg has 5 significant figures. Significant figures are used to provide an indication of the precision of a measurement and should be used when performing calculations.

Measurements are the numerical values used to quantify the size, amount, or extent of something. Measurements are used to describe physical attributes and characteristics, such as length, width, weight, height, area, volume, speed, temperature, pressure, force, energy, power, and time. Measurements are also used to determine the amount of a certain material that is needed for a given purpose, such as a recipe. Measurements are essential for scientific investigation, engineering, and other activities that require precision and accuracy.

The measurement of 0.03412 kg has 5 significant figures. Significant figures are the meaningful digits of a number that are important in providing information about the measurement. In this measurement, the 4 digits after the decimal point (3412) provide the precision of the measurement, and therefore are significant figures. The leading zero does not provide any additional precision and is not a significant figure. Therefore, the measurement of 0.03412 kg has 5 significant figures.

Significant figures are used to provide an indication of the precision of a measurement. For example, a measurement of 0.03412 kg has a precision of 0.00001 kg, which is greater than a measurement of 0.3412 kg, which has a precision of 0.0001 kg. The more significant figures a measurement has, the more precise it is.

Significant figures are also important in calculations. To ensure accuracy, all calculations should be done using the same number of significant figures as the measurements being used. For example, if two measurements, 0.03412 kg and 0.02384 kg, are used in a calculation, the result should be reported to 5 significant figures.

In conclusion, the measurement of 0.03412 kg has 5 significant figures. Significant figures are used to provide an indication of the precision of a measurement and should be used when performing calculations.

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The measurement of 0.03412 kg has 5 significant figures. Significant figures are used to provide an indication of the precision of a measurement and should be used when performing calculations.

Measurements are the numerical values used to quantify the size, amount, or extent of something. Measurements are used to describe physical attributes and characteristics, such as length, width, weight, height, area, volume, speed, temperature, pressure, force, energy, power, and time. Measurements are also used to determine the amount of a certain material that is needed for a given purpose, such as a recipe. Measurements are essential for scientific investigation, engineering, and other activities that require precision and accuracy.

The measurement of 0.03412 kg has 5 significant figures. Significant figures are the meaningful digits of a number that are important in providing information about the measurement. In this measurement, the 4 digits after the decimal point (3412) provide the precision of the measurement, and therefore are significant figures. The leading zero does not provide any additional precision and is not a significant figure. Therefore, the measurement of 0.03412 kg has 5 significant figures.

Significant figures are also important in calculations. To ensure accuracy, all calculations should be done using the same number of significant figures as the measurements being used. For example, if two measurements, 0.03412 kg and 0.02384 kg, are used in a calculation, the result should be reported to 5 significant figures.

In conclusion, the measurement of 0.03412 kg has 5 significant figures. Significant figures are used to provide an indication of the precision of a measurement and should be used when performing calculations.

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The complete question is as follows:

How many significant figure are in 0.03412​ kg?

When two aqueous solutions are combined, a precipitation process takes place in which an insoluble substance (precipitate) develops. Reactions 1, 2, 3, and 5 in the list are precipitation reactions.

When an impermeable material called a precipitate separates from the solution, a reaction known as a precipitation reaction takes place. As an example, a white precipitate of barium sulphate and sodium chloride solution is created when sodium sulphate solution and barium chloride solution are mixed.

An insoluble material is called a precipitate. For instance, barium sulphate and sodium chloride solution is created when sodium sulphate solution and barium chloride solution are combined.

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Answer:

Constructive interference is when two waves interact causing larger waves because the crest will meet a crest or a trough will meet a trough which adds the waves together changing the size of the amplitude.

Destructive interference is when two waves interact causing smaller waves because the crest will meet a trough or a trough will meet a crest which subtracts the waves together changing the size of the amplitude.

The balanced equation for the reaction between silver nitrate (AgNO3) and sodium chloride (NaCl) to form silver chloride (AgCl) and sodium nitrate (NaNO3) is:

AgNO3 + NaCl → AgCl + NaNO3

A balanced equation is a representation of a chemical reaction that shows the reactants and products involved, as well as the ratios in which they combine. The law of conservation of mass states that in a chemical reaction, the mass of the reactants must be equal to the mass of the products, which means that the number and type of atoms on both sides of the equation must be the same.

To balance an equation, coefficients are added to the reactants and products so that the number of atoms of each element on the left side of the equation is equal to the number on the right side. For example, the combustion of methane gas can be represented by the equation CH4 + 2O2 → CO2 + 2H2O.  Balanced equations are essential for understanding chemical reactions and predicting the amount of reactants needed and products formed.

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If the reaction's measured product has impurities that increase its mass over what it would be if it were pure, higher percent yields than 100% are attainable.

Because the real yield is frequently lower than the theoretical value, percent yield is typically lower than 100%. This may be due to incomplete or conflicting reactions or sample loss during recovery.

It implies that interest rates will increase further, yields will increase, and bond prices would decline as a result. So, it is likely that the bond market will continue to see unusually high levels of volatility in the near future.

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Ca(OH)2 in an aqueous solution with a pH of 11.67 has a concentration of 2.50 x 10(-3) M.

The calcium hydroxide aqueous solution has a pH of 11.03. Two moles of hydroxide ions are created from one mole of an aqueous solution of calcium hydroxide.

The pH of a solution can be related to the concentration of hydroxide ions ([OH-]) through the equation: pH + pOH = 14

We can rearrange this equation to solve for [OH-]: [OH-] = 10^(-pOH)

Thus: Ca(OH)2 → Ca^2+ + 2 OH-

Since the molar ratio of Ca(OH)2 to [OH-] is 1:2, the concentration of hydroxide ions in the saturated solution can be calculated as follows:

[OH-] = 2 x [Ca(OH)2]

Now we can use the pH value given in the problem to calculate the pOH:

pOH = 14 - pH

pOH = 14 - 11.67

pOH = 2.33

Substituting this value into the equation for [OH-]:

[OH-] = 10^(-pOH)

[OH-] = 10^(-2.33)

[OH-] = 5.01 x 10^(-3) M

In order to get the concentration of the solution, we can apply the equation for the concentration of hydroxide ions in a saturated solution of Ca(OH)2:

[Ca(OH)2] = [OH-] / 2

[Ca(OH)2] = 5.01 x 10^(-3) M / 2

[Ca(OH)2] = 2.50 x 10^(-3) M

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Arrhenius base -  Releases OH ions when dissolved in water

Arrhenius acid - Releases H+ ions when dissolved in water

Bronsted-Lowry base  - Accepts a proton

Bronsted-Lowry acid - donates a proton

An Arrhenius base is a molecule that decomposes into an OH- or hydroxide in solution when dissolved in water. Look for a molecule ending in OH that does not follow CHx, which denotes an alcohol, to identify the Arrhenius base. Examples of Arrhenius bases include sodium hydroxide, or NaOH.

A substance that raises the concentration of H+ ions in an aqueous solution is known as an Arrhenius acid. Traditional Arrhenius acids are highly polarized covalent substances that dissociate in water to form an anion (A-) and the cation H+. Often, the H+ is referred to as a proton.

Count the hydrogens on each component before and after the reaction to determine if it is an acid or a basic. If there are fewer hydrogens, then the substance is acid (donates hydrogen ions). The material is the base if the hydrogen count has increased (accepts hydrogen ions).

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Answer:

To determine the empirical formula of a compound, we need to know the relative amounts of each element in the compound. Given the masses of iron and sulfur, we can calculate the number of moles of each element present:

moles of iron = 39.27 g / 55.85 g/mol = 0.703 mol

moles of sulfur = 33.77 g / 32.06 g/mol = 1.053 mol

We can then find the ratio of these moles by dividing both by the smallest number of moles (0.703):

0.703 mol Fe : 1.053 mol S

0.667 Fe : 1.000 S

This ratio indicates that there are approximately 0.667 atoms of iron for every 1 atom of sulfur in the compound.

To convert this ratio to a whole-number ratio of atoms, we need to multiply by a factor that will give us whole numbers. We can do this by dividing both sides of the ratio by the smallest number of atoms:

0.667 Fe : 1.000 S

0.667/0.667 Fe : 1.000/0.667 S

1.000 Fe : 1.498 S

This gives us a ratio of approximately 1 atom of iron for every 1.498 atoms of sulfur. To get a whole-number ratio, we can multiply both sides by 2:

2.000 Fe : 2.996 S

Rounding to the nearest whole number, we get a ratio of:

2 Fe : 3 S

Therefore, the empirical formula of the compound is Fe2S3.

The cation of zinc sulfate is Zn²⁺, which is a positively charged ion of zinc.

The anion of zinc sulfate is SO₄²⁻, which is a negatively charged ion of sulfate.

A cation is a positively charged ion that is formed when an atom loses one or more electrons. The loss of electrons causes the atom to have a net positive charge, and it is then referred to as a cation. Cations are formed from metals, which tend to lose electrons to form positively charged ions.

An anion, on the other hand, is a negatively charged ion that is formed when an atom gains one or more electrons. The gain of electrons causes the atom to have a net negative charge, and it is then referred to as an anion. Anions are formed from non-metals, which tend to gain electrons to form negatively charged ions.

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Answer:

To calculate vapor pressure lowering:

Use ΔP = X2 * P2° equation, where X2 is the mole fraction of the solute and P2° is the vapor pressure of the pure solvent at the same temperature.

Calculate mole fraction of glycerol by using moles of glycerol and water.

Calculate vapor pressure of pure water at 50°C using the Antoine equation.

Substitute the values and calculate the vapor pressure lowering, which is 0.459 torr for this problem.

The vapor pressure lowering is 0.213 torr when 10.0 mL of glycerol is added to 500 mL of water at 50°C.

Pressure exerted by vapor in thermodynamic equilibrium with its condensed phases at a certain given temperature in closed system is called vapor pressure.

ΔP = X2 * P0 * (1 - (ρ1 / ρ2))

ΔP is vapor pressure lowering, X2 is mole fraction of the solute (glycerol), P0 is vapor pressure of solvent (water), and ρ1 and ρ2 are the densities of solvent and solution, respectively.

As, moles of glycerol = mass of glycerol / molar mass of glycerol

moles of glycerol = (10.0 mL)(1.26 g/mL) / (92.09 g/mol)

moles of glycerol = 0.136 mol

and moles of water = mass of water / molar mass of water

= (500 mL)(0.988 g/mL) / (18.02 g/mol)

moles of water = 27.5 mol

So, total moles = moles of glycerol + moles of water

total moles = 0.136 mol + 27.5 mol

total moles = 27.6 mol

X2 (mole fraction of glycerol) = moles of glycerol / total moles

= 0.136 mol / 27.6 mol

X2 = 0.00493

ΔP = X2 * P0 * (1 - (ρ1 / ρ2))

= (0.00493)(92.5 torr) * (1 - (0.988 g/mL / 1.250 g/mL))

ΔP = 0.213 torr

Therefore, the vapor pressure lowering is 0.213 torr when 10.0 mL of glycerol is added to 500 mL of water at 50°C.

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Answer:

To calculate the moles of Zn(NO3)2 in 173.50 g of the substance, we first need to know the molar mass of Zn(NO3)2.

The molar mass of Zn(NO3)2 can be calculated by adding the atomic masses of its constituent elements:

Zn: 1 x 65.38 g/mol = 65.38 g/mol

N: 2 x 14.01 g/mol = 28.02 g/mol

O: 6 x 16.00 g/mol = 96.00 g/mol

Molar mass of Zn(NO3)2 = 65.38 + 28.02 + 96.00 = 189.40 g/mol

Now we can use this molar mass to calculate the moles of Zn(NO3)2 in 173.50 g of the substance:

moles = mass/molar mass

moles = 173.50 g/189.40 g/mol

moles = 0.9164 mol

Therefore, there are 0.9164 moles of Zn(NO3)2 in 173.50 g of the substance.

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Answer:

Hept

Explanation:

Non- 9 C9

Dec- 10 C10

Eth- 2 C2

Hepth- 7 C7

So the answer is D, because it idicates a molecule with 7 carbon atoms.

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No, two samples of NaCl and CoCl2 do not have the same mass, but they have the same number of particles.

Mole is the amount of material containing 6.02214 × 10²³ particles.

Molar mass of NaCl (sodium chloride) is 58.44 g/mol, while molar mass of CoCl2 (cobalt chloride) is 129.84 g/mol. Since both samples have same number of moles, it means that they contain same number of particles of their respective compounds. However, mass of each sample will be different due to the difference in molar mass.

For example, if we assume that both samples contain 1 mole of their respective compounds, then mass of NaCl sample will be 58.44 g, while  mass of CoCl2 sample will be 129.84 g. So, two samples have different masses but the same number of particles.

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The equilibrium concentration of ethyl acetate is 4.02 M.

The balanced chemical equation for the reaction is:

acetic acid + ethanol ⇌ ethyl acetate + water

We are given that the initial concentration of acetic acid and ethanol is 8.29 M and that the equilibrium concentration of acetic acid is 3.28 M. Let's call the equilibrium concentration of ethyl acetate x.

Using the equilibrium constant expression for this reaction:

Kc = [ethyl acetate][water] / [acetic acid][ethanol]

We know that this reaction is balanced, meaning that the stoichiometric coefficients for the reactants and products are equal. Therefore, we can write:

Kc = [ethyl acetate][water] / [acetic acid][ethanol]

Kc = x(8.29 - 3.28) / (3.28)(8.29 - x)

Kc = 1.47

Now we can use the equilibrium constant expression to solve for x:

1.47 = x(8.29 - 3.28) / (3.28)(8.29 - x)

1.47(3.28)(8.29 - x) = x(8.29 - 3.28)

12.0437 - 1.47x = 8.29x - 27.1924

9.76x = 39.2361

x = 4.02 M

Therefore, the equilibrium concentration of ethyl acetate is 4.02 M.

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Answer : Option (c) is correct.

During electrolysis, a process in which an electric current is passed through a solution containing ions, two electrodes are immersed in the electrolyte solution. The cathode is the negatively charged electrode, while the anode is the positively charged electrode. The electrolyte solution contains both positively charged ions (cations) and negatively charged ions (anions).

At the anode, oxidation occurs as the positively charged ions (cations) in the electrolyte are attracted to the negatively charged anode. The cations lose electrons and become neutral atoms, and these electrons are transferred to the anode. This loss of electrons by the cations results in their oxidation.

The anode, being the electrode where oxidation occurs, has an excess of electrons, which are attracted by the positively charged cations in the electrolyte. The excess of electrons is due to the fact that the anode is connected to the positive terminal of the power source, which supplies electrons to the electrode.

Answer:

At STP (standard temperature and pressure), the conditions are:

Temperature (T) = 273.15 K Pressure (P) = 1 atm = 101.3 kPa Volume (V) = 22.4 L (for one mole of gas)

So, for a gas at STP with a volume of 5 L, we can use the following formula to calculate the number of moles present:

n = V / Vm

where: n = number of moles V = volume of gas (in liters) Vm = molar volume of gas at STP (22.4 L/mol)

Plugging in the values, we get:

n = 5 L / 22.4 L/mol n = 0.2232 mol (rounded to four significant figures)

Therefore, there are approximately 0.2232 moles of the gas present.

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Answer:

A

Explanation:

They're easy to dislodge a difficult to move through it the crystal

The empirical formula for the compound containing 37.5% carbon, 12.6% hydrogen, and 49.9% oxygen is CH₄O

The following data were obtained from the question:

From the above data, we can obtain the empirical formula for the compound as shown below:

Divide by their molar mass

C = 37.5 / 12 = 3.125

H = 12.6 / 1 = 12.6

O = 49.9 / 16 = 3.119

Divide by the smallest

C = 3.125 / 3.119 = 1

H = 12.6 / 3.119 = 4

O = 3.119 / 3.119 = 1

Thus, we can conclude that the empirical formula is CH₄O

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0.50 mοI οf  titanium diοxide is prοduced with 100 g οf titanium tetrachIοride. Thus the cοrrect answer is οptiοn (c).

The baIanced chemicaI equatiοn fοr the reactiοn is:

TiCI₄ + 2 H₂O → TiO₂ + 4 HCI

Frοm the equatiοn, we can see that 1 mοIe οf TiCI₄ prοduces 1 mοIe οf TiO₂.

Tο caIcuIate the number οf mοIes οf TiO₂ prοduced frοm 100 g οf TiCI₄, we need tο first determine the number οf mοIes οf TiCI₄ present in 100 g.

The mοIar mass οf TiCI₄ is 189.68 g/mοI (47.867 + 4 x 35.453). Using this mοIar mass, we can caIcuIate the number οf mοIes οf TiCI₄ in 100 g as:

mοIes οf TiCI₄= mass οf TiCI₄/ mοIar mass οf TiCI₄

mοIes οf TiCI₄= 100 g / 189.68 g/mοI

mοIes οf TiCI₄= 0.5276 mοI

Since 1 mοIe οf TiCI₄ prοduces 1 mοIe οf TiO₂, the number οf mοIes οf TiO₂ prοduced is aIsο 0.5276 mοI.

Therefοre, the cοrrect answer is οptiοn (c) 0.50 mοI.

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There are approximately 2.526 × 10^26 atoms of O in 46.6 moles of Al2(CO3)3.

To find the number of atoms of O in 46.6 moles of Al2(CO3)3, we need to first calculate the total number of moles of O in the compound and then multiply it by Avogadro's number.

The molecular formula of Al2(CO3)3 shows that there are three O atoms per one CO3 group, and there are three CO3 groups per one Al2(CO3)3 molecule. Therefore, the total number of O atoms in one Al2(CO3)3 molecule is:

3 O atoms/CO3 group × 3 CO3 groups/Al2(CO3)3 molecule = 9 O atoms/Al2(CO3)3 molecule

Next, we need to calculate the total number of moles of O atoms in 46.6 moles of Al2(CO3)3:

46.6 moles Al2(CO3)3 × 9 O atoms/Al2(CO3)3 molecule = 419.4 moles O atoms

Finally, we can calculate the total number of O atoms by multiplying the number of moles of O by Avogadro's number:

419.4 moles O atoms × 6.022 × 10^23 atoms/mole = 2.526 × 10^26 O atoms

Therefore, there are approximately 2.526 × 10^26 atoms of O in 46.6 moles of Al2(CO3)3.

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The IUPAC name of the amine shown is N-ethylbutan-1-amine.

The IUPAC name of an organic compound is a systematic way of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).

It is a standard method to ensure that every organic compound has a unique name, which reflects its structure and the functional groups present in the molecule.

The IUPAC name usually consists of several parts, including the parent chain, substituent groups, and functional groups, arranged in a specific order according to a set of rules.

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Answer:

False. Magnets do not need to touch in order to be affected by magnetic force. Magnetic force is a non-contact force that can act on objects that are some distance apart. The strength of the force depends on the distance between the magnets and their magnetic properties.

The ratio of neutrons to protons, or the N/Z ratio, plays a crucial role in determining a nucleus' stability. The range of N/Z ratios in which nuclei are stable is generally referred to as the belt of stability.

If the forces between the constituents of the nucleus are equal, an atom is stable. If these forces are out of balance or if the nucleus has an excessive amount of internal energy, an atom is unstable (radioactive).

Z = 104 for Rutherfordium, element 104. The isotopes 261Rf and 262Rf, having masses of 261 and 262, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

261Rf: N/Z = (261-104)/157 = 1.08

262Rf: N/Z = (262-104)/158 = 1.09

These N/Z ratios are a little bit higher than the average belt of stability values, which are about 1.0 for heavy nuclei. These isotopes are thought to be reasonably stable because they are close enough.

Z = 109 for Meitnerium, element 109. The isotopes 278Mt and 282Mt, with masses of 278 and 282, respectively, have the longest half-lives. Accordingly, N/Z ratios are:

278Mt: N/Z

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0.5 moles of [tex]H_{2[/tex][tex]O_{2}[/tex] produces 8 grams of [tex]O_{2}[/tex].

What is Moles?

Mole is a unit of measurement used in chemistry to express the amount of a substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12. This number is known as Avogadro's number.

To use dimensional analysis, we need to set up the given equation in terms of units. We can use the molar mass of[tex]H_{2}[/tex][tex]O_{2}[/tex] and [tex]O_{2}[/tex] to convert between moles and grams:

2[tex]H_{2}[/tex]O2 → 2[tex]H_{2}[/tex] + [tex]O_{2}[/tex]

The balanced equation shows that 2 moles of [tex]H_{2}[/tex][tex]O_{2}[/tex] produce 1 mole of [tex]O_{2}[/tex]. We can use this ratio to convert between moles of [tex]H_{2}[/tex][tex]O_{2}[/tex]and moles of[tex]O_{2}[/tex].

0.5 moles of [tex]H_{2}[/tex]O2 x (1 mole of [tex]O_{2}[/tex] / 2 moles of[tex]H_{2}[/tex][tex]O_{2}[/tex]) = 0.25 moles of [tex]O_{2}[/tex]

Now we can use the molar mass of [tex]O_{2}[/tex] to convert moles to grams:

0.25 moles of [tex]O_{2}[/tex] x (32 g of [tex]O_{2}[/tex] / 1 mole of [tex]O_{2}[/tex]) = 8 g of [tex]O_{2}[/tex]

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In 0.05μg, there are  [tex]6.9 * 10^{15} molecules[/tex]  of batrachotoxin.

To calculate the number of molecules of batrachotoxin, we first need to calculate the molar mass of the molecule. This can be done by adding up the atomic masses of the elements in the compound. The elements in batrachotoxin are carbon (C), hydrogen (H), nitrogen (N), and oxygen (O). The atomic masses of these elements are 12 g/mol for C, 1 g/mol for H, 14 g/mol for N, and 16 g/mol for O. Therefore, the molar mass of batrachotoxin is:

Molar mass = 12 g/mol C + 1 g/mol H + 14 g/mol N + 16 g/mol O

Molar mass = 43 g/mol

We then need to calculate the mass of 0.05 μg of batrachotoxin. This can be done by converting 0.05 μg to grams. To do this, we divide 0.05 μg by 1,000,000. This gives us:

[tex]\frac{0.05\mu g }{ 1,000,000 }= 0.00000005 g[/tex]

Now we can calculate the number of molecules of batrachotoxin in 0.05 μg by dividing the mass in grams by the molar mass:

Number of molecules =[tex]\frac{ 0.00000005 g }{ 43 g/mol}[/tex]

Number of molecules = [tex]1.16 * 10^{-8} mol[/tex]

Finally, we can calculate the number of molecules by multiplying the number of moles by Avogadro's number:

Number of molecules =[tex]\frac{1.16 * 10^{-8 }mol * 6.022 * 10^{23 }molecules}{mol}[/tex]

Number of molecules = [tex]6.9 * 10^{15} molecules[/tex]

Therefore, there are  [tex]6.9 * 10^{15} molecules[/tex]  of batrachotoxin in 0.05 μg.

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complete question:Batrachotoxin, C31H42N2O6 an active component of South American arrow poison, is so toxic that 0.05μg can kill a person.

How many molecules is this? Express your answer as an integer

We need 8.8 moles of O2

We need 1.266 moles of K

We will produce 0.96 moles of water

We know that;

2H2O + O2 → 2H2O2

If 1 mole of O2 makes 2 moles of H2O2

x moles of O2 makes 17.6 moles of H2O2

x = 8.8 moles

Again;

2K + HgCl2 → 2KCl + Hg

If 2 moles of K reacts with 1 mole of HgCl2

x moles of K reacts with 0.633 moles of HgCl2

x = 1.266 moles

Again;

C3H8 + 5O2 → 3CO2 + 4H2O

5 moles of O2 produces 4 moles of H2O

1.2 moles of O2 would produce x moles of water

x = 0.96 moles

Again;

2NH3 ---->N2 + 3H2

If 1 moles of N2 is formed when 3 moles of H2 are formed

3 moles of N2 will lead to the formation of 3 * 3/1

= 9 moles of H2

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The empirical formula of Aniline is C9H10N and its molecular formula is C9H9.9N.

To determine the empirical formula of Aniline, we need to calculate the number of moles of each element present in the given mass of the compound and then find the smallest whole-number ratio between them.

Given:

Mass of Aniline = 9.71 mg

Mass of water produced = 6.63 mg

Mass of N2 produced = 1.46 mg

The molecular weight of Aniline = 93 amu

First, let's calculate the number of moles of water and nitrogen produced:

moles of H2O = 6.63 mg / 18.015 g/mol = 0.3680 mmol

moles of N2 = 1.46 mg / 28.014 g/mol = 0.0521 mmol

Next, we need to calculate the number of moles of carbon and nitrogen present in Aniline:

moles of C = (9.71 mg - (0.3680 mmol x 12.011 g/mol)) / 12.011 g/mol = 0.4811 mmol

moles of N = 0.0521 mmol

Now, we need to find the smallest whole-number ratio between these elements. We can divide the number of moles of each element by the smallest value, which is 0.0521 mmol:

moles of C = 0.4811 mmol / 0.0521 mmol = 9.231 ≈ 9

moles of N = 1

moles of H = not calculated, but we can find it using the difference in mass between Aniline and the products formed.

Now, let's calculate the mass of carbon and nitrogen in Aniline:

mass of C = 9 x 12.011 g/mol = 108.099 g/mol

mass of N = 1 x 14.007 g/mol = 14.007 g/mol

Finally, we can calculate the mass of hydrogen by taking the difference between the mass of Aniline and the sum of the masses of carbon, nitrogen, water, and nitrogen:

mass of H = 9.71 mg - (108.099 g/mol + 14.007 g/mol + 6.63 mg + 1.46 mg) = 2.47 mg

Now, we can calculate the number of moles of hydrogen:

moles of H = 2.47 mg / 1.008 g/mol = 2.449 mmol

Finally, we can express the empirical formula of Aniline as: C9H10N

To find the molecular formula, we need to calculate the molecular weight of the empirical formula:

Empirical formula weight = (9 x 12.011 g/mol) + (10 x 1.008 g/mol) + (1 x 14.007 g/mol) = 93.126 g/mol

Now, we can find the molecular formula by dividing the molecular weight of Aniline by the empirical formula weight and multiplying each subscript in the empirical formula by the result:

The molecular weight of Aniline = 93 amu

The molecular weight of the empirical formula = 93.126 g/mol

Molecular formula = empirical formula x (Molecular weight of Aniline / Empirical formula weight)

= C9H10N x (93 amu / 93.126 g/mol)

= C9H9.9N

Therefore, the empirical formula of Aniline is C9H10N and its molecular formula is C9H9.9N.

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Answer:

The change in pH is 0.04.

There are 0.03675 moles of NaI in 175.0 mL of 0.210 M NaI solution.

To calculate the number of moles of NaI in 175.0 mL of 0.210 M NaI solution, we can use the formula:

moles of solute = concentration (in M) x volume (in liters)

First, we need to convert the volume from milliliters to liters:

175.0 mL = 175.0/1000 L = 0.175 L

Now we can plug in the values:

moles of NaI = 0.210 M x 0.175 L = 0.03675 moles of NaI

Therefore, there are 0.03675 moles of NaI in 175.0 mL of 0.210 M NaI solution.

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