5 mole of oxygen are heated at constant volume from `10^(@)C "to" 20^(@)C`. What will be the change in internal energy of the gas? Gram molar specific heat of gas at constant pressure `=8cal. "Mole"^(-1).^(@)C^(-1)` and `R=8.36J "mole"^(-1).^(@)C^(-1)`.

Explanation

To solve the problem of finding the change in internal energy of 5 moles of oxygen heated at constant volume from 10°C to 20°C, we can follow these steps:

### Step 1: Identify Given Values
- Number of moles (n) = 5 moles
- Initial temperature (T1) = 10°C
- Final temperature (T2) = 20°C
- Change in temperature (ΔT) = T2 - T1 = 20°C - 10°C = 10°C
- Specific heat at constant pressure (Cp) = 8 cal/(mole·°C)
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