According to the reaction equation Zn (OH) ₂ = ZnO + H₂O Determine the mass of zinc oxide that is formed upon

According to the reaction equation
Zn (OH) ₂ = ZnO + H₂O
Determine the mass of zinc oxide that is formed upon decomposition of 9.9 g of the starting material

decision
Zn (OH) 2 = ZnO + H2O
1. Find the amount of zinc hydroxide, knowing its mass and molar mass:
n = m / M = 9.9 / 99 = 0.1 mol
2. The reaction equation shows that n (Zn (OH) 2) / n (ZnO) = 1/1, which means
n (ZnO) = 0.1 mol
3. We find the mass of zinc oxide, knowing its number and molar mass:
m (ZnO) = M x n = 81 x 0.1 = 8.1 g
answer 8, 1g

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