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## Homework Statement

A closed vessel contains liquid water at equilibrium with its vapor at 100C and 1 atm. 1 gram of water vapor occupies 1670cm^3. Hvap = 2250Jg^-1. How many molecules are there per cm^3 of vapor?How many vapor molecules strike each cm^2 of liquid surface per second?

## Homework Equations

PV = NKT

Q = lm

## The Attempt at a Solution

N = PV/KT = 3.3E26 molecules of vapor

I used P = 1.013 E5 N m^-2

V = 16.7m^3

T = 373

Not sure how to get how much water there is.

Answers are: 2E19 molecules cm^-2 ; 3.3E23 impacts per second