Question

Water is decomposed using electricity into it's components; hydrogen gas and oxygen gas.
If 5.5 moles of water is decomposed, what mass (in grams) of oxygen gas is produced??

Answer 1

Answer on Question# 44379 Chemistry – Physical Chemistry

Water is decomposed using electricity into it's components; hydrogen gas and oxygen gas. If 5.5 moles of water is decomposed, what mass (in grams) of oxygen gas is produced?

Solution

$$2 \mathrm{H_2O} \rightarrow 2 \mathrm{H_2} + \mathrm{O_2}$$ $$n \left(\mathrm{O_2}\right) = \frac{1}{2} n \left(\mathrm{H_2O}\right) = \frac{1}{2} \cdot 5,5 \text{ moles} = 2,75 \text{ moles}$$ $$M \left(\mathrm{O_2}\right) - \text{Formula mass}$$ $$M \left(\mathrm{O_2}\right) = 32$$ $$m \left(\mathrm{O_2}\right) = n \left(\mathrm{O_2}\right) \cdot M \left(\mathrm{O_2}\right) = 2,75 \cdot 32 = 88 \text{ (g)}.$$

Answer: 88 g.

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