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How to find amount that evaporated

1. Homework Statement
I am working on a lab about the latent heat of vaporization of nitrogen and a part of it needs me to find the amount of liquid nitrogen that had evaporated. and it gives me the density of liquid nitrogen which is 0.0807 g/mL. wouldn't I just take my initial amount 299.7 g and subtract the final amount 159.6 g to get the amount evaporated? how would i find it using the density


2. Homework Equations



3. The Attempt at a Solution

i just subtracted the two and got 140.1 but i feel like this is wrong since i didnt use the density
 

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