How many grams of sodium are needed to produce 2.78 L of hydrogen gas according to the following reaction at 25 °C and 1 atm? sodium (s) + water(ℓ) sodium hydroxide (aq) + hydrogen (g)

g sodium

According to Charle's law

The volume of an ideal gas is directly proportional to the temperature, keeping pressure and moles constant

Thus if we increase temperature of a gas it will increase its volume

In case of balloon, the gas will expand on heating and contract on cooling

Thus our hypothesis supported is

Gases expand when heated and contract when cooled