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Level 62

Stoichiometric Calculations

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conversion factor
a fraction used to convert from one unit to another
formula unit
lowest whole number ratio of ion in an ionic compound
Gram Formula Mass
The mass of one mole of compound.
Gram Molecular Mass
The mass of one mole of a molecular substance.
_______is the amount of a substance that contains the same number of particles as the number of atoms in 12 g of carbon-12. That would be 6.02 x 10 23 atoms.
Mole ratio
A conversion factor that relates the amounts of moles of any two substances involved in a chemical reaction
Standard Temperature and Pressure
The arbitrarily decided standard conditions at which experiments are done: 1 atm and 273 degrees Kelvin (0 degrees Celsius).
General Conversion Factor Equation
Conversion Factor =
Moles =
Converting from Formula Units to Moles -
moles = PV
Converting from Volume of a Gas to Moles
Moles = Grams
Converting from Mass to Moles
Moles = molality × kilograms of solution
Converting from Molality of a Solution to Moles
molarity × liters of solution
Converting from Molarity of a Solution to Moles
The molar mass of HgO is 216.59 g/mol. The molar mass of O2 is 32.00 g/mol. How many moles of HgO are needed to produce 250.0 g of O2?
A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?
A sample of sodium hydroxide (NaOH) has a mass of 160.0 g. The molar mass of NaOH is 40.00 g/mol. How many moles of NaOH does this sample contain?
The molar mass of sucrose (C12H22O11) is 342.3 g/mol. A chemist has a 0.500-mol sample of sucrose. What is the mass, in grams, of this sample?
A chemist has 2.0 mol of methanol (CH3OH). The molar mass of methanol is 32.0 g/mol. What is the mass, in grams, of the sample?
Air is about 78% nitrogen gas (N2) by mass. The molar mass of nitrogen gas is 28.0 g/mol. A 100.0-g sample of air contains how many moles of nitrogen?
What is the mole ratio of butane to carbon dioxide?