#1
Which of the following represents the molecular formula for water?
H2O
ExplanationWater's molecular formula is H2O.
#2
What is the molecular formula for methane?
CH4
ExplanationMethane's molecular formula is CH4.
#3
What is the molecular formula for sulfuric acid?
H2SO4
ExplanationSulfuric acid's molecular formula is H2SO4.
#4
How many oxygen atoms are there in one molecule of carbon dioxide (CO2)?
2
ExplanationOne molecule of CO2 contains 2 oxygen atoms.
#5
What is the empirical formula for a compound composed of 12.0 g of carbon and 4.0 g of hydrogen?
C2H4
ExplanationThe empirical formula is C2H4.
#6
Calculate the percent composition of sodium chloride (NaCl).
Na = 58.44%, Cl = 41.56%
ExplanationThe percent composition of NaCl is Na = 58.44%, Cl = 41.56%.
#7
What is the empirical formula for a compound composed of 30.0% phosphorus and 70.0% oxygen by mass?
P4O10
ExplanationThe empirical formula is P4O10.
#8
Calculate the percent composition of glucose (C6H12O6).
C = 40.0%, H = 6.67%, O = 53.3%
ExplanationThe percent composition of C6H12O6 is C = 40.0%, H = 6.67%, O = 53.3%.
#9
What is the molar mass of magnesium sulfate (MgSO4)?
142.44 g/mol
ExplanationThe molar mass of MgSO4 is 142.44 g/mol.
#10
What is the molar mass of calcium carbonate (CaCO3)?
147.04 g/mol
ExplanationThe molar mass of CaCO3 is 147.04 g/mol.
#11
What is the molar mass of sulfuric acid (H2SO4)?
98.08 g/mol
ExplanationThe molar mass of H2SO4 is 98.08 g/mol.
#12
What is the molar mass of ammonium phosphate ((NH4)3PO4)?
149.09 g/mol
ExplanationThe molar mass of (NH4)3PO4 is 149.09 g/mol.