Question

What is the mass percentage of hydrogen in H2O molecule ?​

Answer 1

$\huge\underline\mathfrak\green{Question}$

What is the mass percentage of hydrogen in H2O molecule ?

$\huge\underline\mathfrak\blue{ Answer }$

Molecular Mass Of H in $H_{2}O$ is 2gm.

( as mass of 1 molecule of H is 1 and in water there are 2 H molecules )

Molecular mass of $H_{2}O$ is 18 gm.

Mass percentage = $\frac {molecular \: mass \:of \:hydrogen}{Molecular\: mass\: of\: water}$× 100 %

$\implies \frac{2}{18}$ × 100%

$\implies \frac {200}{18}$%

$\large{\red{\underline{\tt{ 11.11 percent \: Ans.}}}}$

Answer 2

Answer:

Your Answer.

Atomic mass of Hydrogen(H) = 1u

Atomic mass of Oxygen (O) = 16 u

So, molecular mass of H2O

= 2 * 1 + 16

= 2 + 16

= 18 u

Mass of hydrogen in 18u of H2O = 2u

So , percentage of hydrogen present by mass of H2O is =>

$\begin{gathered}= > \frac \pink{2} \pink{18} \times 100 \\ \\ = > \frac{1}{9} \times 100 \\ \\ = > \frac \red{100} \red{9}\\ \\ = > 11.11\end{gathered}$

So, Answer is 11.11%