Mass % H:

$\mathbf{\%}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{H}\mathbf{=}\frac{\mathbf{mass}\mathbf{}\mathbf{H}\mathbf{}\mathbf{in}\mathbf{}{\mathbf{HC}}_{\mathbf{6}}{\mathbf{H}}_{\mathbf{7}}{\mathbf{O}}_{\mathbf{6}}}{\mathbf{molar}\mathbf{}\mathbf{mass}\mathbf{}{\mathbf{HC}}_{\mathbf{6}}{\mathbf{H}}_{\mathbf{7}}{\mathbf{O}}_{\mathbf{6}}\mathbf{}}\mathbf{\times}\mathbf{100}$

- molar mass HC
_{6}H_{7}O_{6}= 176.12 g/mol

Calculate the percentage by mass of the indicated element in the following compounds.

Hydrogen in ascorbic acid, HC_{6}H_{7}O_{6}, also known as vitamin C. Express your answer using two significant figures.

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