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Formula Mass

An ionic comp...

Question

An ionic compound of element X and chlorine has the formula XCl3.The molecular mass of XCl3 is 118.5.What is the molecular mass of oxide of X?

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Solution

XCl3 mass is 118.5
XCl3 mass is mass of X + 3* mass of Cl
therefore
118.5= mass X + 335.5 ( mass of chlorine is 35.5 )
therefore mass of X is 12 u.
also valency of X is 3 ( By XCl3 formula )
therefore , formula for oxide of X is
X2O3

Mass of X2O3 = 212 + 3* 16= 72

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