Question

This is the chemical formula for talc (the main ingredient in talcum powder): Mg3Si2O52OH2 An analytical chemist has determined by measurements that there are 0.0935 moles of oxygen in a sample of talc. How many moles of hydrogen are in the sample? Round your answer to 3 significant digits.

Answer 1

1 mol of Mg3(Si2O5)2(OH)2 has 2 moles of H and 12 moles of O

Now use:

Moles of H = (2/12)*moles of O

= (2/12)*0.0935 moles

= 0.0156 mol

Answer: 0.0156 mol