Calculate the molar mass of al2 (cro4) 3

Molar mass of Al₂ (CrO₄) ₃ is the mass of one mole of Al₂ (CrO₄) ₃

one mol = weight of Al₂ (CrO₄) ₃ in g / one mol

1) We have to find the atomic mass (in a periodic talbe) of the following elements (in u)

Al=26.98 u

Cr=52 u

O=16 u

2) We calculate the atomic weight of Al₂ (CrO₄) ₃

Atomic weight (Al₂ (CrO₄) ₃) = 2 (26.98 u) + 3[ (52 u) + 4 (16 u) ]=

=53.96 u+3 (52 u+64 u) = 53.96 u+3 (116 u=53.96 u+348 u=401.96 u

3) One mole of (Al₂ (CrO₄) ₃) have 401.96 g of Al₂ (CrO₄) ₃

molar mass=401.96 g / mol

answer: 401.96 g / mol