At 300K, a sample of 3.0 g of gas A occupies the same volume as 0.2 g of hydrogen at 200 K at the same pressure. The molar mass of gas A is _________g `"mol"^(-1)`, (nearest integer) Assume that the behaviour of gases as ideal.
(Given: The molar mass of hydrogen `(H_2)` gas is 2.0 g `"mol"^(-1)`.)

Explanation

To find the molar mass of gas A, we can use the ideal gas law and the information provided in the question. Here’s a step-by-step solution:

### Step 1: Write down the ideal gas law
The ideal gas law is given by the equation:
\[ PV = nRT \]
Where:
- \( P \) = pressure
- \( V \) = volume
...