Mole Test Review
Name ______________________________
1. The volume of a sample of fluorine gas at STP is measured to be 45.9 mL. How many fluorine atoms
are present in the sample?
2. How many moles of nitrogen are in 6.55 x 1023 formula units of magnesium nitride?
3. How many protons are in 13.6 kg of silver nitride?
4. An unknown gas was collected over water and equilibrated. Determine the molar mass of the unknown
gas if a 1.08 g sample occupies a volume of 59.3 mL at 33°C. The barometric pressure is 746 mm Hg.
5. At what temperature (in °C) will chlorine gas at 722 mmHg have a density of 1.48 g/L?
6. An unknown gas is determined to have an empirical formula of CH2. If a 0.176 g sample of this gas
occupies a volume of 35.0 mL at 134 kPa and 175°C, determine its molecular formula.
7. Chemical analysis of an unknown compound indicated that the compound consisted of 54.6 % carbon,
9.0 % hydrogen and 36.4 % oxygen. The molar mass of the compound was found to be 176 g/mol.
Determine the molecular formula.
8. 123g of sucrose is dissolved in 568g of water. The solution has a density of 1.34g/ mL. Determine the
percent concentration, molarity and molality of the solution.