Q1. How many formula units of calcium carbonate are in 0.250 mol of CaCO3? (2 points)
Q2. What is the molar mass of magnesium phosphate? Steps: first derive formula, then calculate molar mass. (2 point)
Q3. How many molecules of ammonia, NH3, have a mass equal to 550 g? (2 points)
Q4. In a reaction, 25 grams of reactant AB breaks down into 10 grams of product A and an unknown amount of product B. Using the law of conservation of mass, how much does product B weigh? (2 point)
Q5. How many moles of calcium metal react with 5.00 mol of hydrochloric acid? (2 points)
__Ca(s) + _HCl(aq) → __CaCl2(aq) + __H2(g)
Q6. How many grams of AgCl, silver chloride, are produced from 25.0 mol of AgNO3, silver nitrate? (3 points)
___AgNO3 + ___BaCl2 → ___AgCl + ___Ba(NO3) 2
Q8. How many grams of potassium chloride, KCl, are produced if 25.0g of potassium chlorate, KClO3, decompose? (2 points)
__KClO3 → __KCl + __O2
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