Internal energy and thermodynamic work
Answers are for parents and teachers.
1
3 mol of monatomic gas is at 400 K. Its internal energy (J, approximately)?
about 1.5·10⁴ J
2
A monatomic gas has 150 kPa and 0.04 m³. Internal energy (J)?
9000
3
A gas expands from 2 l to 6 l at 300 kPa. Work (J)?
1200
4
5 mol of gas is heated isobarically by 10 K. Work done by the gas (J, approximately)?
about 415 J
5
Why does internal energy rise when ice melts into water even though temperature does not change?
The potential energy of interaction between molecules increases (the order breaks down).