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45.1g is the answer but I want to know how you do the problem 10. Benzene (C6H6) freezes at 5.5C and has a freezing point

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45.1g is the answer but I want to know how you do the problem
10. Benzene (C6H6) freezes at 5.5C and has a freezing point depression constant Kf= 5.12C/m. What mass of CO2(MM=44.01g/mol) must be dissolved in 1.5kg of benzene to make a solution with a freezing point of 2C ? A) 20.0g B) 30.1g C) 31.5g D) 4.5.1g E) 70.9g

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