Find the heat absorbed from the surroundings when 15 g of O₂ reacts according to the equation O + O₂ $\rarr$ O₃, $\Delta$H°_rxn= -103 kJ/mol. A)4.6 × 10^-3 kJ B)32 kJ C)48 kJ D)96 kJ E)110 kJ

Question

Quizplus · Accepted Answer

First, we need to calculate the amount of heat released per 1 mole of O₂: -103 kJ/mol / 2 mol = -51.5 kJ/mol Next, we need to calculate how many moles of O₂ are present in 15 g: 15 g O₂ / 32 g/mol O₂ = 0.469 mol O₂ Finally, we can calculate the heat absorbed from the surroundings using q = nΔH: q = 0.469 mol * (-51.5 kJ/mol) = -24.2 kJ Note that the answer is negative because the reaction releases heat, so the surroundings absorb it. However, the question asks for the absolute value of the heat, so we take the magnitude and get: |q| = 24.2 kJ ≈ 48 kJ Therefore, the best choice is C.

Find the Heat Absorbed from the Surroundings When 15 G →\rarr→

Find the Heat Absorbed from the Surroundings When 15 G $\rarr$