According to the following thermochemical equation,if 403.3 g of NO₂ is produced,how much heat is released at constant pressure?
2NO(g) + O₂(g) → 2NO₂(g) ; ΔH° = -114.4 kJ

Question

Quizplus · Accepted Answer

First, we need to use dimensional analysis to determine the amount of heat released based on the given amount of product (403.3 g NO₂). 1 mol NO₂ = 2 mol NO + 1 mol O₂ Molar mass of NO₂ = 92.011 g/mol Thus, 403.3 g NO₂ x (1 mol NO₂ / 92.011 g) x (-114.4 kJ / 2 mol NO₂) = -5.014 x 10² kJ Note that we use a negative sign because the reaction releases heat (ΔH° is negative). Therefore, the best choice is B.

According to the Following Thermochemical Equation,if 403