Answer:
The mass of 1 mole of substance is 40 g
Molar Mass is defined as the mass in grams of one mole of a substance. The units of molar mass are grams per mole (g/mol).
This can be found by dividing the mass present by the number of moles. Mathematically, the units: grams ÷ moles = g/mol.
Hence, Molar mass (M) = mass (m) ÷ moles (n).
Therefore, M = m/n = 4/0.1 = 40 g/mol