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2 years ago

How many moles of H2 are needed to react with 4.8 mol of O2 ?

Chemistry

1 answer:

VLD [36.1K]2 years ago

5 0

Answer:

9.6 mol

Explanation:

Start by writing out the balanced equation of the reaction.

2 $H_{2}$ + $O_{2}$ ⇒ 2 $H_{2}O$

Here you will see 2 mol of hydrogen for every 1 mol of oxygen. Using this ratio, you can assume the amount of hydrogen will always be double that of oxygen. In this case, 4.8 * 2 = 9.6

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Answer:

Approximately 75%.

Explanation:

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$\begin{aligned} m\left(\mathrm{CaCO_3}\right) &= m(\mathrm{Ca})\left/\frac{m(\mathrm{Ca})}{m\left(\mathrm{CaCO_3}\right)}\right. \cr &\approx 30\; \rm g \left/ \frac{2}{5}\right. \cr &= 75\; \rm g \end{aligned}$ .

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