4B.5 and 4B.13 part a

[Jielena_Bragasin2G]

In both of these problems I used w=-(Pext)(delta V) to find work but it is given in atm. In the solutions manual it is multiplied by a constant to convert it to joules. Can someone explain to me what constant should I use to convert my answer into joules? Thanks!

[Harry Zhang 1B]

You would use 1L*atm=101.325J. This can be found in a example problem on page 247.

[Haley Dveirin 1E]

So in the case of 4B 5 the units of w are L atm so you have to multiply it by 8.31447 J/mol K and then divide it by 0.08206 L atm/mol K in order to get the units to be J.