A gas is filled in a vessel at a certain temperature and at a pressure of `80 cm` of Hg. At the same temperature, more gas is filled in the vessel so that its mean increases by `60%`. Determine the resultant pressure in the vessel.

Explanation

To solve the problem, we need to determine the resultant pressure in a vessel after the mean of the gas increases by 60%. Here’s a step-by-step solution:

### Step 1: Understand the relationship between pressure and mass of gas
According to the kinetic theory of gases, at constant temperature and volume, the pressure of a gas is directly proportional to the mass of the gas present in the vessel. This means that if we increase the mass of the gas, the pressure will also increase.

**Hint:** Remember that pressure (P) is proportional to the number of moles (n) of gas, which in turn is proportional to the mass (m) of the gas.

### Step 2: Calculate the initial pressure
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