The moles of hydrogen in the talc sample are 5.67 moles.
Talc are the hydrous silicate minerals. The chemical formula of talc is Mg₃Si₄O₁₀(OH)₂.
From the formula it can be determined that there are: 3 moles of Mg, 4 moles of Si, 12 moles of O and 2 moles of H.
Moles are a type of SI unit of measurement of the amount of substance.
According to the question, magnesium = 8.5 moles
Also, 3 moles of Mg = 2 moles of H
Therefore, moles of H = 8.5 moles × (2 moles H / 3 moles Mg)
moles of H = 5.67 moles
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