Question

Determine the amount of heat (in kJ) given off when 1.26 × 10⁴ g of ammonia are produced according to the equation N₂(g) + 3H₂(g) → 2NH₃(g) ΔH° = -92.6 kJ/mol. Assume that the reaction takes place under standard conditions at 25°C.

Answer 1

To determine the amount of heat given off when 1.26 × 10⁴ g of ammonia is produced, calculate the molar mass of NH₃, convert the given mass to moles, and multiply by the enthalpy change (-92.6 kJ/mol).

Step-by-step explanation:

To determine the amount of heat given off when 1.26 × 10⁴ g of ammonia is produced, we need to calculate the molar mass of ammonia and then use it to convert the given mass to moles. Next, we multiply the moles of ammonia by the enthalpy change of the reaction (-92.6 kJ/mol) to find the amount of heat released.

First, calculate the molar mass of NH₃ (1 nitrogen atom + 3 hydrogen atoms = 28.02 g/mol).

Next, convert the given mass of ammonia (1.26 × 10⁴ g) to moles using the molar mass of NH₃.

Finally, multiply the moles of ammonia by the enthalpy change of the reaction to find the amount of heat released.