A solution is prepared by adding 30.00 g of lactose (milk sugar) to 110.0 g of water at 55 ∘C. The partial pressure of water above the solution is torr. The vapor pressure of pure water at 55 ∘C is 118.0 torr. The MW of lactose is 342.3 g/mol. a. 116.3
b. 169.4
c. 94.1
d. 92.7
e. 1.670

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atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer