WHE #2

Mole Problems

100

Calculate how many grams are in 0.700 moles of H2O2.

23.8 grams

200

Calculate how many grams are in 1.500 moles of KClO.

135.8 grams

300

Calculate how many grams are in 0.200 moles of H2S.

6.82 grams

400

Convert 2.50 moles of KClO3 to grams.

306.37 grams

500

Calculate how many grams are in 0.750 moles of NaOH.

29.9 grams

Empirical Formula

100

Write the empirical formula for C6H6.

C3H3

200

Write the empirical formula for C2H6O2.

CH3O

300

When 2.5000 g of an oxide of mercury, (HgxOy) is decomposed into the elements by heating, 2.405 g of mercury are produced. Calculate the empirical formula.

Hg2O

400

A component of protein called serine has an approximate molar mass of 100 g/mole. If the percent composition is as follows, what is the molecular formula of serine? 

C = %34.95 H= %6.844 O = %46.56 N= %13.59  

C3H7NO3

500

Rubbing alcohol was found to contain 60.0 % carbon, 13.4 % hydrogen, and the remaining mass was due to oxygen. What is the empirical formula of rubbing alcohol?

C3H8O

Molecular Formulas

100

The molar mass of aniline is 93 g/mol. What is its molecular formula?

C6H7N

200

If the molar mass of the compound in problem 3 is 73.8 grams/mole, what’s the molecular formula?

Li2CO3

300

If the molar mass of the compound in problem 1 is 110 grams/mole, what’s the molecular formula?

C6H6O2

400

A compound with an empirical formula of C2OH4 and a molar mass of 88 grams per mole. What is the molecular formula of this compound?

C4O2H8

500

A component of protein called serine has an approximate molar mass of 100 g/mole. If the percent composition is as follows, what is the molecular formula of serine? 

C = %34.95 H= %6.844 O = %46.56 N= %13.59  

C3H7NO3

Percent Composition

100

Find the percent composition for the following compound, N2S2.

N: 30.4%

S: 69.6%

200

Find the percent composition for the following compound, CuBr2.

Cu: 28.45% 

Br: 71.55%

300

Calculate the mass percent of carbon, nitrogen and oxygen in acetamide, C2H5NO.

C %40.6 H %8.5 N %23.7 O %27.1 

400

Find the percent composition for the following compound, NaOH.

Na: 57.48% 

O: 39.99% 

H: 2.53%

500

Find the percent composition for the following compound, (NH4)2S.

N: 41.1%

H: 11.8%

S: 47.1%

Molar Mass

100

Calculate the molar mass of, KOH.

56.1

200

Calculate the molar mass of, Cl2.

71

300

Calculate the molar mass of, Al2(SO4)3.

310.10 grams

400

Calculate the molar mass of, H3PO4.

98

500

Calculate the molar mass of, (NH4)2SO4.

132.1