# Chapter 5 - Thermochemistry - Exercises: 5.48b

$\Delta H = 210 kJ$

#### Work Step by Step

Looking at the coefficients of the thermochemical equation, we see that the formation of 3 moles of acetylene (C2H2) leads to a $\Delta H = 630 kJ$. Therefore, to find the $\Delta H$ of one mole, we divide this number by 3: $\Delta H = 630kJ/3 = 210 kJ$

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