Question

how many grams are in 43 mg?
43 mg | $10^{-3}$ g
————————
| 1 mg
options:
$4.3 \times 10^{-2}$ g
1 mg
43 mg
$4.3 \times 10^{-2}$ mg

Explanation:

Step1: Use unit conversion factor

We know $1\ \text{mg} = 10^{-3}\ \text{g}$, so set up the conversion:
$43\ \text{mg} \times \frac{10^{-3}\ \text{g}}{1\ \text{mg}}$

Step2: Calculate the result

Cancel the mg units and compute:
$43 \times 10^{-3}\ \text{g} = 4.3 \times 10^{-2}\ \text{g}$

Answer:

A. $4.3 \times 10^{-2}\ \text{g}$