Question

The first law of thermodynamics is concerned with the conservation of ________.

• A. energy
• B. number of molecules
• C. number of moles
• D. temperature

Answer 1

The correct option is A energy

According to first law of thermodynamics,

$Q=\Delta U+W$

where $Q$ is the heat flowing, $\Delta U$ is the change in internal energy and $W$ is work done.

It is concerned with the conservation law of energy.