At 300 K, 4 gm calcium is dissolved in hydrochloric acid in an open vessel at the atmoshphere pressure 0.821 atm. Calculate work done by the system.

Explanation

To solve the problem of calculating the work done by the system when 4 g of calcium is dissolved in hydrochloric acid at 300 K and an external pressure of 0.821 atm, we can follow these steps:

### Step 1: Calculate the number of moles of calcium
The molecular weight of calcium (Ca) is 40 g/mol. We can calculate the number of moles (n) of calcium using the formula:

\[ n = \frac{\text{mass}}{\text{molecular weight}} = \frac{4 \, \text{g}}{40 \, \text{g/mol}} = 0.1 \, \text{mol} \]
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