A gas is filled in a container at certain temperature and pressure. At the same temperature more gas is filled in the vessel. Calculate the percentage increase in the mass of the gas. If the ratio of initial and final pressure is 1:2.

Explanation

To solve the problem step by step, we will use the relationship between pressure, volume, and mass of the gas, as well as the concept of percentage increase.

### Step 1: Understand the relationship between pressure and mass
From the ideal gas law, we know that:
\[ PV = nRT \]
Where:
- \( P \) = Pressure
- \( V \) = Volume
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