Indicate the amount of water substance that is formed during the thermal decomposition of ferrum (|||) hydroxide weighing 42.8 g.

univerkov | February 26, 2021 | education

Let’s write the reaction equation:

2Fe (OH) 3 (t) = Fe2O3 + 3H2O

Let’s find the amount of the substance of iron (III) hydroxide:

v (Fe (OH) 3) = m (Fe (OH) 3) / M (Fe (OH) 3) = 42.8 / 107 = 0.4 (mol).

According to the reaction equation, from 2 moles of Fe (OH) 3, 3 moles of H2O are formed, therefore:

v (H2O) = v (Fe (OH) 3) * 3/2 = 0.4 * 3/2 = 0.6 (mol).

Answer: 0.6 mol.

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