Question

When 5.1 litres of water vapour at 100 C were cooled to room temperature, it condensed to form 3.0 mL of liquid water, which had
a mass of 3.0 grams.

Which statement about the water is most likely to be TRUE?

A. Water vapour is weightless but gets mass when it condenses to liquid.
B. When the water vapour condenses, the molecules move close together.
C. The mass of the water vapour was 5.1 kilograms.
D. There are more molecules in the 5.1 litres of water vapour than in the 3.0 grams of liquid water.

Answer 1

Option b) is true

Water condenses to form solid, which has particles much more closer than liquid.