A balloon has 5.0 g mole of helium at `7^(@)C` Calculate
(a) the number of atoms of helium in the balloon,
(b) the total internal energy of the system.

Explanation

To solve the problem step by step, we will tackle each part separately.

### Part (a): Calculate the number of atoms of helium in the balloon.

1. **Identify the number of moles of helium**:
Given that there are 5.0 g moles of helium.

2. **Use Avogadro's number**:
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