If 1.00 g of an unknown molecular compound contains 8.35  1021 molecules, what is its molar mass?

Answer is: molar mass of molecular compound is 71,95 g/mol.

N (compound) = 8,35·10²¹.

n (compound) = N (compound) : Na.

n (compound) = 8,35·10²¹ : 6,022·10²³ 1/mol.

n (compound) = 0,0139 mol.

m (compound) = 1,00 g.

M (compound) = m (compound) : n (compound).

M (compound) = 1 g : 0,0139 mol.

M (compound) = 71,95 g/mol.