A Mixture of Solid NaCl and CaCl₂ Contains 10

Multiple Choice

A mixture of solid NaCl and CaCl₂ contains 10.0 g of NaCl, and an unknown amount of CaCl₂. When the entire mixture is dissolved in 1.00 kg of water, the boiling point changes by 0.25 °C. What mass of CaCl₂ was in the original mixture?
K_b for water is 0.512 K^. kg ^. mol^-1.

A) 5.4 g
B) 8.1 g
C) 35.2 g
D) Not enough data to answer the question
E) None of the above