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 empirical formula of C2H5O2.
Select one:
a. C4H10O4
b. C6H15O6
c. C3H7O3
d. C2H5O2
e. C8H20O8
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 empirical formula of C2H5O2.
Select one:
a. C4H10O4
b. C6H15O6
c. C3H7O3
d. C2H5O2
e. C8H20O8