Determine the mass in grams of 6.63 × 10²¹ atoms of chromium. (The mass of one mole of chromium is 52.00 g.)

Answer:

uh A.)? [ZnCI2+H2]? /////////

Answer:

C. A technological society has both a positive and negative impact on the environment

Explanation:

It is correct to suggest and to acclaim that a technological society has both a positive and negative impact on the environment.

The environment is the region of space where living organisms and non-living components can be found.

We see that technology has both negative and positive effects on the environment.

Answer:

It is tested by multiple scientist

Explanation:

just took the test, B is correct

Answer:

You are right, it is the Engineer

Explanation:

The theoretical yield (in kilograms) of water produced from this reaction : 0.285 kg

Reaction

2C₁₂H₂₄O₁₁ + 25O₂ → 24CO₂ + 24H₂O

mass of C₁₂H₂₄O₁₁ - isomaltitol = 454 g

mol C₁₂H₂₄O₁₁(MW=344.31 g/mol) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{454}{344.31 g/mol}\\\\mol=1.319[/tex]

mol H₂O based on C₁₂H₂₄O₁₁ as limiting reactant(O₂-oxygen as an excess)

From the equation above, mol ratio of C₁₂H₂₄O₁₁  : H₂O = 2 : 24, so mol H₂O:

[tex]\tt mol~H_2O=\dfrac{24}{2}\times 1.319=15.828[/tex]

then mass H₂O (MW=18 g/mol) :

[tex]\tt mass=mol\times MW\\\\mass=15.828\times 18=284.904~g=0.285~kg[/tex]

Answer:

B) 6

Explanation:

Methylcyclopentane consist of 3 types of hydrogen which are 1° (primary), 2° (secondary) and 3° (tertiary) hydrogen atoms. In the chlorination of methylcyclopentane, there are four monochlorinated products possible and two stereoisomers.

Answer: 5000

Explanation:

Answer:

Ram Ranch

Explanation:

Answer: FLEXUP by lil yacthy and future and playboi carti one of the best songs right now

Explanation:

Answer:A

Explanation:Binary Fission, meaning ‘getting divided into half’ is a type of asexual reproduction where a single living cell grows twice its size and then splits to form two identical daughter cells, each carrying a copy of the parent cell’s genetic material. Examples of cells that use binary fission for division

Answer:

i think its a

Explanation:

Answer:

See explanation

Explanation:

Electronegativity is the ability of an atom in a molecule to attract the  shared electrons of a covalent bond towards itself. Electronegativity is a trend that increases across the period and decreases down the group in the periodic table.

All the compounds listed are halides of phosphorus. The electronegativity of halogens decrease in the order; F> Cl> Br > I. Hence F has the greatest electronegativity in the group. It decreases as atomic and ionic radius increases.

As the electronegativity of the halogen atom decreases, the electron pair on the halogen atom lie closer to the central  phosphorus atom hence the repulsion between electrons increases and so does the bond angle increase likewise.

Answer:

because the cells make drugs at the start of injury!

Answer:

1.59 molal

Explanation:

The definition of molality is:

So first we calculate the moles of solute (D-glucose, C₆H₁₂O₆), using its molar mass:

Then we convert grams of water into kg:

Finally we calculate the molality:

Answer:

pH = 7.49

Explanation:

This is a buffer solution. We can apply Henderson Hasselbach equation:

pH = pKa + log ((total mmoles - mmoles HCl) / mmoles HCl)

We have the same amount of mmoles.

35 mL . 0.400 M = 14 mmoles HCl

35 mL . 0.400 M = 14 mmoles NaClO

Total moles are 28 mmoles.

We replace data:

pH = pKa + log ((28 mmoles -14 mmoles) / 14 mmoles)

Notice that the relation in log = 1. So pH = pKa

pKa for HClO is 7.49

When pH = pKa we have the same amount of base and acid. Notice, that we have the same mmoles of HCl and NaClO.

Remember that a buffer can be prepared with:

a) A weak acid and its conjugate base (acetic /acetate)

A weak base and its conjugate acid (ammonia/ammonium)

b) A weak acid with a strong base, where the acid can be in excess.

c) A conjugate base (salt from weak acid) with a strong acid, where the base can be in excess. (This case but, the base is not in excess, that's why ph = pKa)

Answer:

C7H8N4O. The molecular formula C7H8N4O2 (molar mass: 180.16 g/mol) may refer to: Paraxanthine. Theobromine.

Answer: The Avagadro constant = 6.022 x 10²³ denotes the no of molecules in one mole of the substance

Explanation:

Explanation:

A formula mass of substance is a sum of the average atomics masses of each atom represented in the chemical formula and is expressed in atomic mass units.the formula mass of covalent compound is also called the molecular mass

Answer:

Volcanic Eruption releases heated ash and Tephra through its column generating its own lightning.

Hope it helps!<3

Answer:

λ = 0.029×10² m

f = 0.57×10¹⁷ s⁻¹

Explanation:

Given data:

Wavelength of wave = ?

Frequency of wave = 102.7×10⁶ s⁻¹

Solution:

Formula:

Speed of wave = Wavelength  × Frequency

speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s = λ × 102.7×10⁶ s⁻¹

λ = 3×10⁸ m/s /  102.7×10⁶ s⁻¹

λ = 0.029×10² m

2nd)

Given data:

Wavelength of wave = 5.267 nm (5.267×10⁻⁹ m)

Frequency of wave =  ?

Solution:

Formula:

Speed of wave = Wavelength  × Frequency

speed of wave = 3×10⁸ m/s

by putting values,

3×10⁸ m/s = 5.267×10⁻⁹ m × f

f = 3×10⁸ m/s /  5.267×10⁻⁹ m

f = 0.57×10¹⁷ s⁻¹

Answer:

protons and electrons

Explanation:

because two atoms of the same elements have different(mass)isotope so the answer is B

Answer:

ΔH°rxn = -780kJ

Explanation:

It is possible to find enthalpy change of a reaction by the sum of analogue reactions (Hess's law).

Using the reactions:

1. 2Al(s) + 3/2O2(g) → Al2O3(s)  ΔH°rxn = −1601 kJ/mol

2. 2Fe(s) + 3/2O2(g) → Fe2O3(s)  ΔH°rxn = −821 kJ/mol

1 - 2:

2Al(s) + Fe2O3(s) → Al2O3(s) + 2Fe(s)

ΔH°rxn = ΔH°rxn(1) - ΔH°rxn(2)

ΔH°rxn = −1601 kJ/mol - (-821 kJ/mol)

ΔH°rxn = -780kJ

Considering the Hess's Law, the enthalpy change for the reaction is -780 kJ.

Hess's Law indicates that the enthalpy change in a chemical reaction will be the same whether it occurs in a single stage or in several stages. That is, the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when it occurs in a single stage.

In this case you want to calculate the enthalpy change of:

2 Al(s) + Fe₂O₃(s) → 2 Fe(s) + Al₂O₃(s)

which occurs in two stages.

You know the following reactions, with their corresponding enthalpies:

Equation 1:  2 Al(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Al₂O₃(s)      ΔH = −1601 kJ/mol  

Equation 2:  2 Fe(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Fe₂O₃(s)      ΔH = −821 kJ/mol

Because of the way formation reactions are defined, any chemical reaction can be written as a combination of formation reactions, some going forward and some going back.

To obtain the enthalpy of the desired chemical reaction you need 2 moles of Al(s) on reactant side and it is present in first equation so let's write this as such.

Now, 1 mole of Fe₂O₃(s)   must be a reactant and is present in the second equation. Since this equation has 1 mole of Fe₂O₃(s)   on the product side, it is necessary to locate the Fe₂O₃(s)  on the reactant side (invert it). When an equation is inverted, the sign of ΔH also changes.

You know that two equations with their corresponding enthalpies are:

Equation 1:  2 Al(s) + [tex]\frac{3}{2}[/tex] O₂(g) → Al₂O₃(s)      ΔH = −1601 kJ/mol  

Equation 2:  Fe₂O₃(s)  → 2 Fe(s) + [tex]\frac{3}{2}[/tex] O₂(g)   ΔH = 821 kJ/mol

Adding or canceling the reactants and products as appropriate, and adding the enthalpies algebraically, you obtain:

2 Al(s) + Fe₂O₃(s) → 2 Fe(s) + Al₂O₃(s)     ΔH= -780 kJ

Finally, the enthalpy change for the reaction is -780 kJ.

Learn more:  

Answer:

Wrong

Explanation:

Because they are non metals and tends to form negative charged ions

Answer:

30 g/mol

Explanation:

Step 1: Given data

Step 2: Calculate the moles corresponding to 11.2 L of gas

At normal temperature and pressure (1 atm, 293.15 K), 1 mol of a gas has a volume of 24.05 L.

11.2 L × 1 mol/24.05 L = 0.466 mol

Step 3: Calculate the molecular mass of the gas

0.466 moles of the gas weigh 14 g. The molecular mass is:

M = 14 g/0.466 mol = 30 g/mol

suppose we have a reaction as follows :

nA + mB ---> pC + qD

where n,m,p,q are natural numbers

these natural numbers are called stoichiometric coefficients .

Eg:

2P + 3Br2 ---> 2PBr3

here, 2, 3 from reactant side and 2 from product side are called stoichiometric coefficients

hope this helps...

Answer:

It should contain 32 hydrogen.

Answer:

Distance of something it can be any type of distance

Answer: The correct answer is Organism.

Explanation:

because.....

that is the part that control the rest.

*Hopefully this helps!!!

Answer:

organism or organ system

Explanation:

i forgot what that dude said up there

Answer:

180 g Ca

General Formulas and Concepts:

Chemistry - Atomic Structure

Explanation:

Step 1: Define

4.4 mol Ca

Step 2: Identify Conversions

Molar Mass of Ca - 40.08 g/mol

Step 3: Convert

[tex]4.4 \ mol \ Ca(\frac{40.08 \ g \ Ca}{1 \ mol \ Ca} )[/tex] = 176.352 g Ca

Step 4: Check

We are given 2 sig figs. Follow sig fig rules and round.

176.352 g Ca ≈ 180 g Ca