Formula |
M , Molar Mass(gmol-1) |
mass of sample(g) |
n, number ofmoles of sample |
N, number of atoms,molecules or formula units |
Cr2O3 |
152 |
2nd answer |
9.63 x 1023 |
To determine the molar mass of Cr2O3 the atomic mass of each of the elements in the formula must be obtained from the periodic table. The atomic masses are;
Cr 52.0 u
O 16.0 u
Since there are 2 hydrogen atoms and 4 oxygen atoms in the formula the molecular mass is;
Cr 2 x 52.0 u = 104 u
O 3 x 16.0 u = 48.0 u
Total = 152 gmol-1