SCH4C1-02 Stoichiometry Test
Answer all questions and box your final answers! You will
receive 1 Communication mark for each answer boxed!
Inquiry
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Communication
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1. Potassium chlorate decomposes to form potassium chloride and oxygen gas. What mass of
potassium chlorate is required to form 120.0 g of potassium chloride?
/3
2. Consider the following balanced equation: 2 AgNO3 + CaCl2 Æ 2 AgCl + Ca(NO3)2. Calculate
the amount of silver chloride, AgCl, that will be produced from 135.0 g of calcium chloride.
/3
3. Consider the following balanced chemical equation: 3 Mg + 2 H3PO4 Æ 3 H2 + Mg3(PO4)2
Calculate the amount of magnesium phosphate that will be produced from 112.0 g of magnesium.
/5
4. Iron(III) oxide can be formed by combining iron and oxygen gas. Determine the mass of iron(III)
oxide produced when 48.2 g of oxygen gas reacts with 12.0 g iron.
Fe(s) +
O2(g)
Æ
Fe2O3(s)
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5. Consider the following balanced equation: 2 Li3PO4 + 3 Zn(NO3)2 Æ Zn3(PO4)2 + 6 LiNO3
Determine the mass of lithium phosphate required to react completely with 415.0 g of zinc
nitrate.
/5
6. Consider the following balanced combustion reaction: CH4 + 2 O2 Æ CO2 + 2 H2O
a) Determine the mass of water when 18.3 g of methane, CH4 and 4.5g oxygen react.
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b) What is the mass of the leftover excess reagent?