One gram of an alloy of `Al and Mg` when treated with excess of dilute `HCI` forms `MgCI_2, AICI_3` and hydrogen. The evolved hydrogen collected over Hg at 0°C has a volume of `1.20` litres at `0.92` atm pressure. Calculate the composition of the alloy. `("AI" = 27, "Mg" = 24)`

Explanation

To solve the problem of determining the composition of the alloy of aluminum (Al) and magnesium (Mg) based on the volume of hydrogen evolved during the reaction with dilute HCl, we will follow these steps:

### Step 1: Write the Reaction
When aluminum and magnesium react with dilute HCl, the following reactions occur:
- For magnesium:
\[ \text{Mg} + 2 \text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2 \]
...