Review Of Stoichiometry Question Preview (ID: 54890)
General Questions On Stochiometric Concepts.
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The starting material in an equation is
a) quantity
b) theoretical yield
c) reactant
d) mole
The actual amount of product in a chemical reaction
a) percent yield
b) actual yield
c) theoretical yield
d) mole
The calculations of quantities in a chemical reaction
a) theorectical yield
b) stoichiometry
c) percent error
d) actual yield
The substance that is left over after a reaction takes place
a) reactant
b) limiting reagent
c) mole
d) excess reagent
The coefficients of a balbanced equation indicate relative number of
a) atoms
b) grams
c) moles
d) elements
The law of conservation of mass means reactants and products must have equal
a) masses
b) # of molecules
c) volumes
d) moles
When dealing with gases, the calculations are done at the conditions of
a) atmospheric pressure
b) boiling point
c) STP
d) vapor pressure
The molar mass of NaBr is
a) 303 g
b) 103 g
c) 33 g
d) 1030 g
How many moles of CO are needed to react with 6.5 moles of O2 in the following 2CO + O2 --2CO2
a) 6.5 moles
b) 3.3 moles
c) 17 moles
d) 13 moles
what is the percent yield in a reation that has an actual yield of 12 grams and a theoretical yield of 15 grams ?
a) 8 %
b) 80%
c) 75%
d) 20%
The reactant in an equation that runs out 1st is known as the
a) base reactant
b) excess reactant
c) product
d) limiting reactant
The number of liters in 1 mole of any gas at STP is
a) 22.4
b) 24.4
c) 24.2
d) 42.2
Standard temperature and pressure are
a) 0K and 101.3 kPa
b) 0 C and 1 kPa
c) 0C and 101.3 kPa
d) 0K and 1 atm
To calculate a stoichiometric problem that gives a mass and wants a mass, what must you use to do the conversions
a) STP
b) molar mass of the reactants
c) 22.4
d) coefficients
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