The mass of 5.6 litres of a certain gas at S.T .P. is 12 g. What is the relative molecular mass or molar mass of the gas ?

Explanation

To find the relative molecular mass (molar mass) of the gas given that 5.6 liters of it at STP has a mass of 12 grams, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Relationship at STP**:
At Standard Temperature and Pressure (STP), 22.4 liters of any gas corresponds to its molar mass in grams. This means that if we know the volume of gas and its mass, we can find its molar mass.

2. **Identify Given Values**:
...