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General Chemistry

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Dimensional Analysis: Units of Energy

CHEM-3HBJQX

The SI unit of energy is the joule, $\text{J}$.

$$1 \text{ J} = 1 \text{ kg} \left( \frac{\text{m}}{\text{s}} \right) ^{2} = 1 \text{ } \frac{\text{kg} \cdot \text{m} ^{2}}{\text{s} ^{2}}$$

The SI unit of power is the watt, $\text{W}$.

$$1 \text{ W} = 1 \text{ kg} \cdot \text{m} ^{2} \cdot \text{s} ^{-3}$$

And the SI unit of pressure is the pascal, $\text{Pa}$.

$$1 \text{ Pa} = 1 \text{ } \frac{\text{kg}}{\text{m} \cdot \text{s} ^{2}}$$

Which of the following are also units of energy? Select ALL that apply.

A

$\text{W} \cdot \text{s}$

B

$\text{kW} \cdot \text{h}$

C

$\text{W} / \text{s}$

D

$\text{W} / \text{h}$

E

$\text{W} / \text{Pa}$

F

$\text{L} \cdot \text{kPa}$