Determine the mass of calcium in 40 g of calcium oxide.

univerkov | November 25, 2020 | education

Given:
m (Ca0) = 40 g
To find:
m (Ca) -?
Decision:
2CaO = 2Ca + O2
n (CaO) = m / M = 40 g / 56 g / mol = 0.714 mol
n (Ca) = n (CaO) = 0.714 mol
m (Ca) = n * m = 0.714 mol * 40 g = 28.56 g
Answer: m (Ca) = 28.56 g

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