Acetylene (C₂H₂) is a gas used for welding. Combustion of acetylene releases 1301.1 kJ/mol. Calculate the energy (in kilojoules) released in burning 65.0 g acetylene.

Sucrose (C₁₂H₂₂O₁₁) is the end product of photosynthesis and is found in a lot of food plants. The complete combustion of sucrose releases 5155.7 kJ/mol of energy. Calculate the amount of energy required to produce 18.0 g of sucrose.

Condensing ethanol vapor to liquid releases 38.56 kJ/mol of heat. Calculate the energy released when 56.00 mL of ethanol is condensed.

The melting of potassium requires 2.33 kJ/mol. Calculate the amount of energy required to melt 26.3 g of potassium.

Lithium oxide can be obtained by the decomposition of lithium peroxide: 2 Li₂O₂(s) → 2 Li₂O(s) + O₂(g); ΔH°rxn = –561.5 kJ/mol

Calculate the energy (in kilocalories) released when 25.0 g lithium oxide is produced.

The ΔH for the formation of hydrogen peroxide from its elements is —32.58 kcal/mol ( —136.3 kJ/mol). In the formation of 0.850 mol of hydrogen peroxide, how much energy in kcal and kJ is released?