1. Calculate the molar mass of H 2 CO 3 . Select one: a. 74.04 g/mol b. 61.02 g/

Question

1. Calculate the molar mass of H2CO3.

Select one:

a. 74.04 g/mol

b. 61.02 g/mol

c. 60.01 g/mol

d. 62.03 g/mol

e. 29.02 g/mol

2. How many moles of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.

Select one:

a. 1.42 x 10-4 moles

b. 1.21 moles

c. 7.02 x 103 moles

d. 0.829 moles

e. 1.00 mole

3.Calculate the mass percent composition of lithium in Li3PO4.

Select one:

a. 26.75 %

b. 20.82 %

c. 55.27 %

d. 17.98 %

e. 30.72 %

4. Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19 g/mol.

Select one:

a. C8H10N4O2

b. C8H12N4O2

c. C4H5N2O

d. C8H10N2O

5. Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C2H5O2.

Select one:

a. C4H10O4

b. C6H15O6

c. C3H7O3

d. C2H5O2

e. C8H20O8

Explanation / Answer

1. Calculate the molar mass of H2CO3.

d. 62.03 g/mol

2. How many moles of N2O4 are in 76.3 g N2O4? The molar mass of N2O4 is 92.02 g/mol.

d. 0.829 moles

3.Calculate the mass percent composition of lithium in Li3PO4.

d. 17.98 %

4. Determine the molecular formula of a compound that is 49.48% carbon, 5.19% hydrogen, 28.85% nitrogen, and 16.48% oxygen. The molecular weight is 194.19 g/mol.

a. C8H10N4O2

5. Determine the molecular formula of a compound that has a molar mass of 183.2 g/mol and an empirical formula of C2H5O2.

b. C6H15O6

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