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"The vapor pressure of water at 45 degrees C is 71.93mmhg. What is the vapor pressure of water over a solution prepared from citric acid (C6H8O7) in...

"The vapor pressure of water at 45 degrees C is 71.93mmhg. What is the vapor pressure of water over a solution prepared from citric acid (C6H8O7) in 0.420kg of water at this temperature"

I understand that i am supposed to work out the Molarity (M=mol of solute/ Litres of solution) first then apply it to the equation c=kP, however how would i be able to figure out the Molarity when water is given in kg and not L? can I use the molality (m=mol of solute/mass of solvent in kg) as c instead? or is there another way to figure this out?

Thank you

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