If you have a balanced equation you can convert between mass and energy using dimensional analysis.

Calculate the heat associated with the decomposition of 1.15g of NO₂(g) according to the equation:

N₂(g) + 2O₂(g) → 2NO₂(g)

ΔH = +67.6 kJ

Try this one on your own:

Calculate the mass of ethane, C₂H₆, which must be burned to produce 100kJ of heat.

2C₂H₆(g) + 7O₂(g) → 4CO₂(g) + 6H₂O(l)

ΔH = -3120kJ

Interactive popup. Assistance may be required. Check your answer Close

Is this reaction endothermic or exothermic?

Interactive popup. Assistance may be required. Check your answer Exothermic, because the ΔH is negative. Close