Question

Calculate the number of moles of magnesium oxide in 80g of the compound.(average atomic masses of Mg=24 and O=16)

Answer 1

Explanation:

• MgO = Mg+O

Atomic Mass of Mgo= 24+16=40

no. of moles= wt/mol.wt = 80/40= 2 moles

Answer 2

Answer:

2 moles

Explanation:

given mass= 80

total molecular mass=24+16=40. moles=given mass/molecular mass. =80/40=2