5. The volume of a sample of helium is 4.50 L at 20.0°C and 203.0 kPa. What will its volume be
at 10.0"C and 203.0 kPa?

The volume will be 2.25 L.

Explanation:

As per Charle's law, the volume of a gaseous system is directly proportional to the temperature provided the system is at constant pressure. Since volume of gas is directly proportional to the temperature of the gas molecules, V∝ T

So, in case there is a change in temperature with constant pressure, then there will be equal change in volume.

Thus, here = 4.50 L , = 20 °C and = = 203 k Pa , = 10°C.

Since, volume and temperature is directly proportional then there will be increase in volume with increase in temperature and vice versa.

So, the new volume is 2.25 L.

its first and third is your answer i did the qustion the fourth isnt right