2.2 g of nitrous oxide () gas is cooled at a constant pressure of 1 atm from 310 K to 270 K causing the compression of the gas from 217.1 mL to 167.75 mL. The change in internal energy of the process,

Question

2.2 g of nitrous oxide () gas is cooled at a constant pressure of 1 atm from 310 K to 270 K causing the compression of the gas from 217.1 mL to 167.75 mL. The change in internal energy of the process,  is '' J. The value of '' is  (nearest integer).

[Given: atomic mass of N  and of O . Molar heat capacity of  is ]

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Strategy:
 Apply the First Law of Thermodynamics: . Calculate  from molar heat capacity () and  from expansion/compression against constant pressure ().

Step 1: Calculate heat ()
.
.

Step 2: Calculate work ()

.

Step 3: Find 
. Magnitude .

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