Calculate the number of moles of silver present in a 10.35 g sample of silver. Report your answer to the appropriate number of significant figures.

Answer 1

moles of silver = mass / molar mass

=10.35 / 107.86 (molar mass of silver is 107.9 g mol^-1)

= 0.09596 moles

The question had the mass of silver to 4 significant figures. Hence the answer must be given to 4 significant numbers. The zeros at the beginning of a number are not significant. That's why we started counting the significant numbers from 0.09 up to 4 digits - 0.09596