Acetone (molar mass of 58.08 g/mol....

Question

Acetone (molar mass of 58.08 g/mol) is a common industrial solvent and has a heat of vaporization of +31.3 kJ/mol. If 1.0g of acetone is spilt, how much energy (in J) will it absorb as it vaporizes? Give the quantity and unit (e.g. 3.5 cm).

Answer 1

Find the moles of acetone present:

1.0 g x 1 mol/58.08 g = 0.01722 moles

We know it takes +31.3 kJ of heat per mole so we simply multiply this value by the number of moles...

31.3 kJ/mol x 0.01722 moles = +0.5389 kJ = +5400 kJ (to 2 sig. figs)