Question

3) What is the mass of a sample consisting of 1.00 X 1022 formula units of MgSO.?(​

Answer 1

number of moles = 1.00 X 10^22 ÷ 6.022 × 10^23

= 0.0166 moles

mass = number of moles × molar mass

= 0.0166 × 120.37 = 2.00 g