A bank roll of 40 coins weighs approximately 0.313 kg. What is the mass in grams of a single coin?

The density of the metal in units of grams per milliliter is 11.31 g/mL

The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as

Density = mass / volume

The following data were obtained from the question:

Density = mass / volume

Density of metal = 23.7412 / 2.1

Density of metal = 11.31 g/mL

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Molar volume of hydrogen gas is because 'some bubbles of hydrogen gas remained clinging to the sides of the tube'

The volume occupied by 1 mole of the molecules of a gas at STP i.e. standard temperature and pressure

Here if liquid is not vaporized completely then bubbles of hydrogen gas remained clinging to the sides of the tube and then the condensed vapor in the flask contains the air which is initially occupied before the liquid is heated and when calculating the molar mass of the vapor the moles of air which are initially present are not excluded, so that the molar mass of the vapor would be increase in large value

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Answer:

which question doyou need the answer?

Answer:

5.3x1022 atoms

Explanation:

If we were to represent five grams of iron in term of the number of atoms of iron, we would get 5.3x1022 atoms of iron.

All of the Bg atoms (beans) are 9.689 atoms

Butyl glycol  is a clear, colorless, oily liquid with a unique sweet yet mild odor and has the formula C₆H₁₄O₂ it is a butyl ether of ethylene glycol and is miscible with water and common organic solvents it has been produced industrially for over half a century and is used primarily as a solvent in paints and surface coatings but also in inks and cleaning products.

Here given sample is Bg element bag and weigh = 0.01 g

Bg means butyl glycol atomic mass of butyl glycol is 62.07g/mol

So here to find atom;

0.01/atomic mass×6.02×10²³

0.01/62.07g/mol×6.02×10²³

= 9.698 all atoms of bg (bean)

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Answer:

1122 cm cubed

Explanation:

The formula for volume of a rectangle would be length times height times width, so just do 17 * 11 * 6 to get your answer, which should be 1122 with units of cm cubed, or cm^3.

Hope this helps! Let me know if you have any confusion!

The mass of chlorine is 9.9 * 10^6 kg.

Total mass of CFC = M(CFC) * number of cars = 1.0 kg * 1.00 * 10^8

= 1.00 * 10^8 kg

Mass of the leaked CFC ;

% leaked = m(leaked) *100 / m(total)

m(leaked) = o.24 * 1.00 * 10^8 kg

m(leaked) = 2.4 * 10^6 kg

Now no. of moles of CFC:

n(CFC) = m(CFC) / MM(CFC) = 2.4 * 10^9 g / 170.92 g/mol = 0.014 * 10^9 mol

= 1.4 * 10^7 mol

No. of moles of chlorine ;

n(Cl) = n(CFC)*2

= 1.4  * 10^7 mol *2

= 2.8 * 10^7 mol

Now at last the mass of the chlorine :

m(Cl) = n(Cl) * MM(Cl)

= 2.8 * 10^7 mol * 35.453 g/mol

= 99.2 * 10^10 g

Mass of Cl = 9.9 * 10^6 Kg

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Taking into account the reaction stoichiometry, 633.75 grams of nitrogen monoxide can form by the reaction of 507 g of ammonia and 845 g of oxygen

In first place, the balanced reaction is:

4 NH₃ + 5 O₂ → 4 NO + 6 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. This means the when the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 68 grams of NH₃ reacts with 160 grams of O₂, 507 grams of NH₃ reacts with how much mass of O₂?

mass of O₂= (507 grams of NH₃×160 grams of O₂)÷ 68 grams of NH₃

mass of O₂= 1,192.94 grams

But 1,192.94 grams of O₂ are not available, 845 grams are available. Since you have less mass than you need to react with 507 grams of NH₃, O₂ will be the limiting reagent.

The following rule of three can be applied: if by reaction stoichiometry 160 grams of O₂ form 120 grams of NO, 845 grams of O₂ form how much mass of NO?

mass of NO= (845 grams of O₂×120 grams of NO)÷ 160 grams of O₂

mass of NO= 633.75 grams

Finally, 633.75 grams of nitrogen monoxide can form by the reaction of 507 g of ammonia and 845 g of oxygen.

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The compressibility of gases is more difficult than that of liquids. Because, the intermolecular forces in gases is very less and to compress the diffused gas molecules high pressure have to be applied.

Compressibility of a substance is the ability to compress to decrease its volume under high pressure. It is dependent on the intermolecular force in the substance.

In liquids unlike solids there is some space for the particles to move apart and that is why liquid can flow. In the case of gases, this distance between particles is greater and particles are free to spread everywhere. Therefore, the intermolecular attraction is very less in gaseous substances.

To compress the substance, the force of attraction between particles have to be increased and volume have to be decreased.  Therefore, it is too difficult to compress gases, in which particles are far apart from each other.

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Formula weight of NH4F is 37.037 g/mol

The total of the atomic weights in the empirical formula of the compound is the formula mass, often referred to as formula weight, of a molecule. Atomic mass units are used in the formula for weight (amu)

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As per conversion units, 45.3 grams is each person's final serving of 1 burger.

As 1 burger has a weight of 1 pound which is equal to 453 grams ,and as each burger looses 10% of it's weight while cooking .

So the weight of 1 burger after cooking is,

10/100×453=45.3 g

Thus,each person's final serving of 1 burger is 45.3 grams.

Conversion  units or unit conversion expresses the same property with a different unit of measurement.It is a numerical expression or a number that is used to change  one set of units to another.

It usually occurs through multiplicative conversion factors through which the measured quantity is changed without changing it's effects.

There are different conversion systems such as:

1) SI system

2)CGS system

3)MKS system

4) FPS system

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Answer:The right answer is they don’t belong with it

Explanation:He didn’t cause

The functional groups that are present the compound is shown in the image is;

The functional group is the atom, group of atoms or bond that is responsible for the chemical reactivity of the members of a particular family of organic compounds. We have to note that there are several families of organic compounds and the reactivity of these families is determined mostly by the kind of functional group that we have in that particular molecule.

Now we have the structure that has been shown in the image attached. We now have to look at the image and determine the kind of functional groups that we have in the molecule. In this case, we are actually looking out for the very points along the chain where a chemical reaction is possible.

We can see that the functional groups that we have here are;

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Answer:

74.25

Explanation:

27 miles = 1 gallon

1 mile = 1/27 mile

Distance to cover = 892 miles

We will multiply this number with gallons of gas used for 1 mile.

892 miles = 1/27 * 892

892 miles = 33.04 gallons of gas

Rounding off to nearest whole number;

892 miles = 33 gallons

Cost of one gallon of gas = $2.25

Cost of 33 gallons = 2.25*33 = $74.25

She will spend $74.25 on gas.

The molecular formula is a notation indicating the number of atoms of each element present in a compound.

The molecular formula of a compound with given empirical formula can be calculated as follows:

molecular formula = (empirical formula)n

The molecular formula of the given compound is as follows:

(SF5)n = 254.1

{32 + 19(5)}n = 254.1

127n = 254.1

n = 2

Molecular formula = (SF5)₂ = S₂F₁0

(CH₂O)n = 180.156 amu

{12 + 2 + 16}n = 180.156

(30)n = 180.156

n = 6

Molecular formula = (CH₂O)₆ = C₆H₁₂O₆

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Answer:

795.702

Explanation:

1. Rate law - A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation.

Step (1) is the rate-determining step because it is the slow step, it determines the reaction's overall pace; therefore,

Rate law= K [H₂O₂]  [I⁻]

2. order of reaction = second order

The Order of Reaction describes how the rate of a reaction depends on the concentration of each component. As a result, the rate of a first-order reaction depends on the concentration of a single species.

3. First step is the rate determining step because it is the slow step. Slow step determines the rate.

The rate-determining step is the one that establishes the speed (rate) of the complete chemical reaction.

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Your question is incomplete. For missing part refer the image below.

A chemist is called by the highway patrol to identify a clear colorless liquid that was spilled on the freeway. The test chemist could do to identify whether the liquid is a mixture or a substance is melting point.

If it is to be identified that whether a liquid is a mixture or a pure substance, testing the melting point is preferably considered.

Melting point is a a range of temperature of a substance from which the first crystal starts melting.

Pure substances have sharp melting point but an impure substance or a mixture melts over a given range of temperature.

By looking at the overall composition, pure substance and mixture can be identified visually but it is quite difficult in case of a clear, colorless liquid.

Therefore, melting points can be used to find out whether a liquid is a mixture or a substance.

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The 3 main layers of earth has its own features, as follows;

The earth is known to be a kind of  fragmental particles that are made up of different part of the surface of the globe.

Note therefore, The 3 main layers of earth has its own features, as follows;

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Answer: I think it's C

Explanation:

Probably wrong. I have a different type of chemistry.

When we assume the specific heat of the solution is equal to the specific heat of water ΔHdissolution is 27×10⁻⁵

A calorimeter is a device used for heat measurements necessary for calorimetry

Here given data is 4.79g = KBr and are dissolved in 109.00g water and temperature is 21.08°C and according to calorimeter heat of capacity = 1.84 J/°C

We have to calculate enthalpy of dissolution of KBr = ?

ΔHdissolution = 27×10⁻⁵

KBr+H₂0→KBr ΔH=?

qreaction = -qcal

1.79×1.84(-2.4) = 0.8936 J

1000 = -0.0008936

4.79+109.00 = 522.11 g

qcal = 522.11 g×1.84(-2.4) = -2305 J

qreaction = -qcal = -2305 J

n(KBr) = 4.79/74.55gmol⁻¹ = 0.0642mol

2305/ 0.0642mol = 0.00002787mol⁻¹

= 27×10⁻⁵

ΔHdissolution = 27×10⁻⁵

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Answer:

A. 3.7×10^-5 km

Explanation:

Whenever there is scientific notation, you always move the decimal the amount of places that the exponent tells you. For a, you would move the decimal 5 times to the left and the km version will be equivalent to the cm version. I hope this helps!

The quantity is equivalent to 3.7 cm is  3.7×10⁻⁵ km. Therefore, option A is correct.

The term scientific notation is defined as a way of writing very large or very small numbers. A number is written in scientific notation when a number between 1 and 10 is multiplied by a power of 10.

For example, 650,000,000 can be written in scientific notation as 6.5 ✕ 10^8.

Scientific notation is used to simplify numbers that are too big.

In the scientific notation, you always displace the decimal the amount of places that the exponent tells you. Then would move the decimal 5 times to the left and the km version will be equivalent to the cm version.

Thus, The quantity is equivalent to 3.7 cm is  3.7×10⁻⁵ km, option A is correct.

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A proton has a charge of +1 and is larger in size then an electron.

Negatively charged electrons typically orbit the atomic nucleus of an atom. Protons and neutrons are substantially larger than electrons. Their charge is as powerful as a proton despite their small size; hence one proton and one electron will cancel each other out. Protons have a mass of 1 atomic mass unit (amu), or around 1.671027 kilograms, and a positive electrical charge of 1 (+1). Electrons are negatively charged particles, but protons are positively charged particles. The magnitude of the charge of an electron and a proton is the same, which is 1.6×10−19C. Electrons revolve around the nucleus of an atom in discrete orbits, but the protons reside inside the nucleus of the atom.

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It is important to know the different apparatus in the laboratory and how to do it because these apparatus are handled carefully, and the experiment is done very carefully to avoid any mistakes.

A laboratory is a place where all scientific apparatus and instruments are put and experiments are done. These places are kept safe and hygienic and all experiment is done precisely to get results.

Thus, knowing the various lab equipment and how to utilize it is crucial because errors might happen during experiments because of how carefully this equipment must be handled.

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Chromium oxide's empirical formula is Cr₂O₃

The simplest whole-number ratio of atoms in a compound is the empirical formula. The proportion of atoms to moles is the same. Our task then is to determine the molar ratio of Cr to O.

Cr's mass is 7.35 g.

10.74 g of chromium oxide are equal to 10.74 g of chromium and 10.74 g of oxygen.

O's mass is 10.74 g - 7.35 g, or 3.39 g.

Moles of Mg = 52.00 g Mg = 0.1413 mol Mg/7.35 g Mg = 1 mol Mg

Moles of O equal 3.39 g O to 1 mol O and 16.00 g O to 0.2119 mol O

For every 3 mol of O, there are 2 mol of Cr.

Chromium oxide's empirical formula is Cr₂O₃.

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On converting 167 mL/h , we get 4.008 L/d

Converting 167 mL/h to units of liters per day

1L=1000mL

1d=24hrs

So  167 mL/1h x1L/1000mLx24h/1d=4008L/1000d

=4.008 L/d

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The equation of the double displacement reaction is:

The reaction between solid zinc(II) sulfide reacts with aqueous hydrobromic acid (HBr) is an example of a double displacement reaction.

In the reaction, bromide ion from the hydrobromic acid and the sulfide ion from the zinc sulfide both displace each other from their respective positive ions to form new products. The products formed are aqueous zinc(II) bromide and dihydrogen sulfide gas.

The equation of the double displacement reaction is given below:

ZnS (s) + 2 HBr (aq) → ZnBr₂ (aq) + H₂S (g)

The zinc sulfide exists as a solid whereas the hydrobromic acid is an aqueous solution. The zinc (ii) bromide formed exists as an aqueous solution whereas dihydrogen sulfide is a gas.

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Note that the complete question is given below:

Solid zinc(II) sulfide reacts with aqueous hydrobromic acid (HBr) to form aqueous zinc(II) bromide and dihydrogen sulfide gas.

Express your answer as a chemical equation. Identify all of the phases in your answer.