How many kilojoules in whiskey?

Whiskey contains about 239 kcal per 100 ml. There are 4.184 kilojoules in 1 kcal, so 100 ml of whiskey contains 239 x 4.184 = 1,000 kilojoules. A standard shot of whiskey is 30 ml, so it contains 300 kilojoules.