A 4.000 g sample of an unknown metal, M, was completely burned in excess O2 to yield 0.02225 mol of the metal oxide, M2O3. What is the metal

Question

Chemistry

Francesca Jacobson

21 July, 21:56

A 4.000 g sample of an unknown metal, M, was completely burned in excess O2 to yield 0.02225 mol of the metal oxide, M2O3. What is the metal

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Howard · Answer 1

4X + 3O₂ = 2X₂O₃

n (X₂O₃) = 0.02225 mol

m (X) = 4.000 g

x - the molar mass of metal

m (X) / 4x=n (X₂O₃) / 2

x=m (X) / {2n (X₂O₃) }

x=4.000/{2*0.02225) = 89.89 g/mol

X=Y (yttrium)