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 calculate the work done by the system when 4 grams of calcium is dissolved in hydrochloric acid at 300 K and atmospheric pressure of 0.821 atm, we can follow these steps:

### Step 1: Identify the Reaction
The reaction between calcium (Ca) and hydrochloric acid (HCl) can be represented as:
\[ \text{Ca (s)} + 2 \text{HCl (aq)} \rightarrow \text{CaCl}_2 \text{ (aq)} + \text{H}_2 \text{ (g)} \]
In this reaction, 1 mole of calcium produces 1 mole of hydrogen gas.
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