Formula |
M , Molar Mass(gmol-1) |
mass of sample(g) |
n, number ofmoles of sample |
N, number of atoms,molecules or formula units |
H2SO4 |
98.0 |
0.825 |
0.00842 |
5.07x 1021 molecules |
We are to calculate the number of molecules in the sample. How do we know we calculating molecules, rather than atoms or formula units? Since H2SO4 is a covalent compound it exists as molecules at the atomic level. To convert from moles to molecules we need to use Avogadro's number.