Consider the reaction 2Al + 3CuSO4 -> Al2(SO4)3 + 3Cu. What is the maximum amount of Cu that could be produced by reacting 20.9 grams of Al with excess CuSO4?

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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