How much work can be done by `100` calories of heat?

Explanation

To determine how much work can be done by 100 calories of heat, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the First Law of Thermodynamics**:
The first law of thermodynamics states that the change in internal energy (ΔU) of a system is equal to the heat added to the system (Q) minus the work done by the system (W). Mathematically, this is expressed as:
\[
\Delta U = Q - W
...