Aballoon at 32 °c is filled with 21 l of air. what would its volume be at a temperature of 52 °c, assuming pressure remains constant?
a.)19 l
b.)22 l
c.)24 l
d.)25 l

the answer is minerals.

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.

there are two significant figures.