Answer to Question #67934 in General Chemistry for Noush

Question

A sample of rubbing alcohol solution contains ethanol, C2H5OH(l). If the sample contains 1.25x10^23 atoms of hydrogen in the ethanol, what amount in moles of ethanol is in the sample?

Answer 1

The amount of moles for atom\molecule\compound etc. can be calculated based on amount of atom\molecule\structural units etc. using Avogadro constant (NA=6.02x10^23) that represents 1 mole. One molecule of ethanol consists 6 hydrogen atoms, so result will be calculated the following way:
n(ethanol)=(1.25×〖10〗^23)/(6.02×〖10〗^23×6)=0.0346 mole