The formula of calcium oxide is CaO. The relative
atomic masses are: Ca = 40,0 = 16.
complete the following statements:
a ) 40g of calcium combine with ____ g of oxygen to form 56 g of calcium oxide.
b) 4.0g of calcium combine with ____ g of oxygen to form 5.6 g of calcium oxide.
c) When 0.4g of calcium reacts in oxygen, the increase in mass is ___ g.
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Answer: We know that calcium and oxygen react in a fixed ratio of 5:2, by mass, to produce 7g of calcium oxide. When 5g of calcium react with 20g of oxygen, the same amount of calcium oxide will be formed. Therefore, 7g of calcium oxide will be formed when 5g of calcium will react with 20g of oxygen.
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