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I think the question is incomplete bcoz molecular mass of X, Y, Z are not given , so we cannot calculate moles ... But if the question is this much then -
Moles= given mass / molar mass
moles 0f X= 45/Wx . ( bcoz its 45% by wt. so this means there is 45g of X in 100 g of solution)
moles of Y= 15/ Wy .
moles of Z= 40/ Wz .
Mole fraction = moles of compound / total moles.
Xx = moles of X / total moles(i.e. moles of X + Y + Z)
And so on for Y and Z.
Cannot be determined without their molecular mass!
u need to give their molecular mass
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