What volume of hydrogen at STP required to reduce 7.95 grams of cupric oxide to give metal? 

Explanation

To solve the problem of determining the volume of hydrogen gas required to reduce 7.95 grams of cupric oxide (CuO) to copper at standard temperature and pressure (STP), we can follow these steps:

### Step-by-Step Solution:

1. **Write the Balanced Chemical Equation**:
The reaction between cupric oxide and hydrogen can be represented as:
\[
\text{CuO} + \text{H}_2 \rightarrow \text{Cu} + \text{H}_2\text{O}
...