how many oxygen atoms are in 1.60g of quartz - SiO2?

how do you figure out atoms to grams and visa versa? the weight of 1 SiO2=60.0848g/mol.

please help

1 answer

oxygen atoms?

Number= moles O * avagradro number
= 2*1.60/molmassSiO2 * avagradro number.