April 18, 2016

Enthalpy Change questions, can anyone help me, please?

3. 25.9 kJ + 1/2 H2 (g) + 1/2 I2(g) ————- HI(g)
(a) How much energy is needed for the reaction of 4.57 * 10^24 molecules of iodine, I2, with excess hydrogen, H2?



find moles using avagadro’s number:
4.57 e24 molecules of iodine @ 1 mole / 6.02 e23 molecules = 7.59 moles I2

find heat needed:
7.59 moles I2 @ 25.9 kJ / 1/2 mol I2 = 393kJ

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