Question

water is 2 parts of hydrogen and 1 part oxygen. for one molecule of water each atom has the atomic mass unit, u,shown. what percent o the mass of a water molecule is hydrogen

Answer 1

Answer:

11.19 %

Explanation:

1 molecule water = 2 H + 1 O

If H = 1.008 u and O = 16.00 u, then

Water = 2H + 1 O = (2 × 1.008 u) + (1 × 16.00 u) = 2.016 u + 16.00 u = 18.02 u

The formula for mass percent is

$\% \text{ by mass} = \frac{\text{Mass of H}}{\text{Total mass}} \times 100 \%$

So,

$\%\text{ H} = \frac{\text{2.016 u}}{\text{18.02 u}} \times 100 \% = 11.19 \%$

Answer 2

Answer:

11.19

Explanation: