Chemistry Coursework

Thermochemistry and Stoichiometry

For each of the items below, use the given equation and associated enthalpy value to calculate the theoretical value asked for. Show all of your work and give the correct units for each value you write. Highly encouraged to print this off and do it by hand.

1. Given the thermochemical equation: N2(g) + 3 H2(g) → 2 NH3(g) ΔH = −91.8 kJ

how much energy is given off when 222.4 g of N2 reacts? Solution -729 kJ

2. Given the thermochemical equation: N2(g) + O2(g) → 2 NO(g) ΔH = 180.6 kJ

If 300 kJ of energy are supplied with unlimited nitrogen and oxygen, what mass of NO can be made?

3. Given the thermochemical equation: N2(g) + 3 H2(g) → 2 NH3(g) ΔH = −91.8 kJ How much heat is given off when 1.00 g of H2 reacts?

4. Given the thermochemical equation: CO2(g) → CO(g) + O2(g) ΔH = 566 kJ

how much energy is absorbed when 85.2 g of carbon dioxide are reacted?

5. Given the thermochemical equation: 2 Na+(aq) + SO42−(aq) → Na2SO4(s) ΔH = 819.8 kJ

how much energy is absorbed when 89 g of SO42−(aq) are reacted?

6. NaHCO3 decomposes when exposed to heat: 2 NaHCO3(s) → Na2CO3(s) + CO2(g) + H2O(ℓ) ΔH = 91.5 kJ What mass of NaHCO3 is decomposed by 1.2 x 103 kJ?