Question

26 J of heat is added to some gas in a container. The gas then does 7 J of work on the walls of the
container. What is the change in the internal energy of gas?
O 19 J
25 J
O 19 kJ​

Answer 1

Answer:

19 Joules is the correct answer

Explanation:

Heat is added to the system: 

$Q = + \: 26 \: J$

Work done by the gas :

$W=+6 J$

From forst law of thermodynamics , 

$Q=ΔU+W$

$∴ 26=ΔU+7 ⟹ΔU=+19 J</p><p></p><p></p><p>$