If the mole fraction of 4.5 moles of solute is 0.5, what is the number of moles

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Question

If the mole fraction of 4.5 moles of solute is 0.5, what is the number of moles of solvent?

Options:

A . 9

B . 4.5

C . 1.5

D . 3

Answer: Option B
Answer: (b).4.5

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