A mixture of aluminium and zinc weighing 1.67 g was completely dissolved in acid and 1.69 litres of hydrogen measured at 0°C and 1 atmospheric pressure were evolved. What was the original weight of aluminium in the mixture?

Explanation

To solve the problem, we will follow these steps:

### Step 1: Define Variables
Let the weight of aluminum in the mixture be \( x \) grams and the weight of zinc be \( y \) grams. According to the problem, we have:
\[ x + y = 1.67 \quad \text{(1)} \]

...