Brass is an ally of Cu and Zn. A sample of brass weighing 5.793 g when treated with excess of dil `H_2SO_4` gives 324 " mL of " dry `H_2` at `20^@C` and 750 mm pressure. What is the percentage of Cu by weight in the alloy.

Explanation

To find the percentage of copper (Cu) by weight in the brass alloy, we will follow these steps:

### Step 1: Understand the Reaction
Brass is an alloy of copper (Cu) and zinc (Zn). When treated with dilute sulfuric acid (H₂SO₄), only zinc reacts to produce hydrogen gas (H₂). The reaction can be represented as:
\[ \text{Zn} + \text{H}_2\text{SO}_4 \rightarrow \text{ZnSO}_4 + \text{H}_2 \]

### Step 2: Gather Given Data
- Mass of brass sample = 5.793 g
...