Assume the molar mass of X to be 100 g/mol and the mass of the sample is 100 g.
Hence the moles of X and Y are:
0.40 mol X
1.20 mol Y
The elements X and Y form a compound that is 40% X and 60% Y by mass. The atomic mass of X is twice that of Y.
What is the empirical formula of the compound?
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