Question

Chemistry help please!

Answer 1

A and then C

Dimensional analysis

`\begin{array}{lll}n & = & m / M \\ & = & 8.33 \; \text{g H} / (1.008 \; \text{g H} \cdot\text{mol H}^(-1))\\ & = & 8.26 \; \text{mol H}\end{array}`

`\begin{array}{lll} N & = & n \cdot A_r \\ & = & 8.26 \; \text{mol H} * 6.023 * 10^(23) \; \text{mol}^(-1) \\ &= & 4.93 * 10^(24) \; \text{H atoms}\end{array}`

`\begin{array}{lll}N & = & n \cdot A_r \\ & = & 0.417 \; \text{mol O}* 6.02 * 10^(23) \; \text{mol}^(-1) \\ & = &2.51 * 10^(23) \; \text{O atoms}\end{array}`