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Question

A compound consists of 47.8% zinc and 52% chlorine by mass. The empirical formula of the compound is ZnxCly, where x and y can have the values:

A
1 and 1
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B
1 and 2
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C
2 and 1
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D
2 and 3
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Solution

The correct option is B 1 and 2
A compound consists of 47.8% zinc and 52% chlorine by mass.
100 g of compound will have 47.8 g zinc and 52 g chlorine by mass.
The atomic masses of zinc and chlorine are 65.4 g/mol and 35.5 g/mol respectively.
The number of moles of zinc =47.8g65.4g/mol=0.73 mol.
The number of moles of chlorine =52g35.5g/mol=1.47 mol.
The mole ratio zinc : chlorine =0.73:1.47=1:2.
The empirical formula will be ZnxCly=Zn1Cl2.
Hence, x and y can have the values 1 and 2.

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