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If the ideal gas given in the problem 45...

If the ideal gas given in the problem 45 expands against constant external pressure of 1 atm what is the q value?

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Formula,
q=-W `" "p_(ex)=1atm`
`=p_("ex") (V_(2)-V_(1)) " "p_("gas")=10 atm`
`=1(20-2) " "V_(1)=2 lit`
=18 lit. atm `" "V_(2)=20 lit`
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