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To solve mole-mass problems requires a balanced chemical equation and a mole ratio. Use the coefficients from the balanced equation and multiply it by the appropriate mole ratio to get an answer. Then multiply that number by the molar mass of the element or compound to get your final answer. This quiz will cover simple mole-mass problems. You will need a calculator and a periodic table. Select the best answer from the choices.
If you have two moles of potassium phosphate, what is the mass of potassium nitrate that is produced? K3PO4 + Al(NO3)3 --> 3KNO3 + AlPO4
200g
120g
204g
202g
If you have two moles of potassium phosphate, what is the mass of aluminum phosphate that is produced? K3PO4 + Al(NO3)3 --> 3KNO3 + AlPO4
120g
244g
366g
430g
If you have 5.50 mol of calcium carbide (CaC2), how much acetylene (C2H2) do you get? CaC2 + 2H2O --> Ca(OH)2 + C2H2
122g
143g
230g
223g
If you have 5.50 mol of calcium carbide (CaC2), what is the mass of calcium hydroxide (Ca(OH)2) do you get? CaC2 + 2H2O --> Ca(OH)2 + C2H2
233g
323g
403g
407g
Pearls are composed mainly of calcium carbonate. If you put them in acid, they will dissolve. If you have .0250 mol of hydrochloric acid (HCl), what is the mass of the pearl that can dissolve in it? CaCO3 + 2HCl --> CaCl2 + H2O + CO2
1.25g
1.78g
2.87g
7.8g
Pearls are composed mainly of calcium carbonate. If you put them in acid, they will dissolve. If you have .0250 mol of hydrochloric acid (HCl), what is the mass of water that is produced? CaCO3 + 2HCl --> CaCl2 + H2O + CO2
1.08g
10.8g
11g
12g
The copper metal reacts with silver nitrate (copper(II) nitrate is one product). How many grams of copper are required to form 250 g of silver?
56g
74g
70g
76g
Copper metal reacts with silver nitrate to form silver and copper (II) nitrate. How many grams of silver will be produced from 3.65 moles of silver nitrate?
129g
234g
325g
394g
