Question

Calculate the number of moles in 270 gm of aluminium. (Atomic mass of Al = 27 u)

Answer 1

27 g of Al=1 mole

1 g of Al =1/27 moles

=>270 g of Al=1/27 *270 moles=10 moles

Answer 2

atomic mass= 27 u

given mass=270 gm

No.of moles= Number of mole given mass × molar mass

therefore, 27 u × 270 g = 7,290