Question

How many moles of CO2 are contained in a 12.5g sample of dry ice?(pure solid CO2)

Answer 1

apply the formula \(moles=\dfrac{mass~(in~g)}{Molar~mass~(in~g/mol)}\)

The molar mass of each individual atom can be found on the periodic table, you need to add it for every atom.
For example, the molar mass of hydrogen is 1.001 g/mol, the molar mass of \(H_2\) is 1.001 g/mol* 2= 2.002 g/mol.

Answer 2

ok so what do I do to get the moles that are contained in 12.5g sample would the answer be the first calculation?

Answer 3

yes, use the formula i posted.