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

Jasmin

Chemistry

31 July, 07:01

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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Kameron Ellis · 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)