Calculate the average atomic mass of hydrogen using the following data:

Isotope	$\%$ Natural abundance	Molar mass
$^1H$	$99.985$	$1$
$^2H$	$0.015$	$2$

(A) The average atomic mass is calculated by the formula:
$\text{Average Atomic Mass} = \frac{(\text{Abundance of } ^1H \times \text{Mass of } ^1H) + (\text{Abundance of } ^2H \times \text{Mass of } ^2H)}{100}$
Substituting the given values:
$= \frac{(99.985 \times 1) + (0.015 \times 2)}{100}$
$= \frac{99.985 + 0.030}{100}$
$= \frac{100.015}{100} = 1.00015 \ u$