Question

calculate the number of mole of 1.5 kg of MgO​

Answer 1

Explanation:

1.5 kg MgO × 1000 g/kg = 1500 g MgO

m(MgO) = 1500 g MgO

M(MgO) = 24.305 g/mol Mg + 15.999 g/mol O = 40.304 g MgO/mol MgO

n(MgO) = 1500 g MgO/40.304 g MgO/mol MgO = 37 mol MgO to two significant figures.

Hope it will be helpful for you

Answer 2

1.5 kg = 1500 g
Molar mass of MgO = 24+16 = 40g

No. of moles = given mass/ molar mass
= 1500/40
= 37.5

Ans: 37.5 moles