Name __________________________
Block___________________________
Stoichiometry Quiz
II. Give all the relationships that exist in fraction form for the following reaction.
4 NH3 + 3 O2
2 N2 + 6 H2O
III. 1)Given the reaction above, how many moles of nitrogen can be produced from 5.56 moles of NH3 ? What
is assumed ?
1)
assumed ?
2) Given the reaction above ,how many moles of oxygen are needed to react with 2.4 moles of NH3 ?
2)
3) The following is encountered as a side reaction in the manufacturing of rayon from wood pulp.
3 CS2 + 6 NaOH
2 Na2CS3 + Na2CO3 + 3 H2O
How many grams of sodium hydroxide are needed to produce 82.58 grams of sodium carbonate ?
3)
4) Given, CaO + 3 C
3.3 X 1024 atoms of carbon ?
CaC2 + CO , how many grams of carbon monoxide will be produced from
4)
5) Aluminum will replace chromium when it reacts with chromium (III) oxide . a) Balance the chemical
reaction and find
a)_______________________________________________________________________________________
b) How many grams of chromium are formed when 27.2 g of Al reacts with 91.3 g of Cr2O3?
5b)
c) How much excess reagent is there ?
5c)
6) Given , N2 + 3 H2
2 NH3, how much ammonia can be produced from 178 g of N2 reacting with
31 grams of hydrogen gas ? How much excess reagent is there ?
6a)
6b)excess
7) Consider the reaction of salicylic acid and acetic anhydride to produce aspirin.
2 C7H6O3 + C4H6O3
2 C9H8O4 + water
Assume you have 14.4 grams of C7H6O3 and that it is your limiting reagent. If you obtain 6.26 g of pure
aspirin from the reaction, what are the theoretical and percent yields for the reaction
7) theor% yield
8) 24.2 grams of phosphorous react with 49.1 grams of diatomic bromine to produce 34.1 grams of phosphorous
tribromide. Find the percent yield of the product and the mass of excess reactant.
8)excess% yield-
9) Pure nitrogen gas can be prepared in the lab by the reaction of NH3 and copper (II) oxide according to the
following unbalanced chemical equation
NH3 + CuO
N2 + Cu + H2O
If you treat 5.589 g of CuO with 0.686g of ammonia, how many grams of nitrogen should you obtain ? If you
actually obtain only 0.345 g of nitrogen, what is the percent yield ? How much excess reactant is left over ?
9) theor% yieldexcess-