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An aqueous CaCl2 solution has a vapor pressure of 80.8 mmHg at 50 ∘C. The vapor...

An aqueous CaCl2 solution has a vapor pressure of 80.8 mmHg at 50 ∘C. The vapor pressure of pure water at this temperature is 92.6 mmHg. What is the concentration of CaCl2 in mass percent?

I have done this multiple times and always get 47% but my prof insists it is 23%. Could someone post a step by step so I can compare my calculations? Thank you!

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