Question

What quantity of copper oxide will react with 2.80 L of hydrogen at NTP?

• A. $79.5g$
• B. 2g
• C. $9.9g$
• D. $22.4g$

Answer 1

Answer: (C)

$9.9g$

Answer 2

(3) : $\underset{79.5g}{CuO} + \underset{22.4L}{H_{2}} \rightarrow Cu + H_{2}O$

$22.4LofH_{2} \equiv 79.5gofCuO$

$2.80LofH_{2} \equiv \frac{79. \times 5}{22.4} \times 2.80 = 9.9gofCuO$