the correct answer is 20g of MgO contains 0.5 moles
Amount of MgO, w = 20g
Molar mass of MgO, M = (24+16)g mol-¹ = 40g mol-1
To find:
No. of moles of MgO in 20g, n = ?
We know that,
No. of moles = given mass(w) molar mass(M)
:: no. of moles in 20g of MgO, n = 20g 40gmol-1 → n = 0.5 mol
The molar mass of a complex mixture is determined by dividing its weight by the amount of that chemical, represented as the number of moles in the test, expressed in moles. The molar mass of a material is a bulk characteristic instead of a molecular one.
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