Determine the heat given off to the surroundings when 9.873 g of aluminum reacts according to the equation 2al + fe2o3 → al2o3 + 2fe, δh°rxn= -849.1 kj/mol.

Answer : The heat given off to the surroundings will be, -155.38 KJ

Solution : Given,

Mass of aluminium = 9.873 g

Molar mass of aluminium = 27 g/mole

First we have to calculate the moles of aluminium.

The given balanced reaction is,

From the reaction, we conclude that

2 moles of aluminum releases heat energy = -849.1 KJ

0.366 moles of aluminium releases heat energy =

Therefore, the heat given off to the surroundings will be, -155.38 KJ