Amount of kJ evolved or absorbed?

Question

The following thermochemical equation is for the reaction of methane(g) with water(g) to form hydrogen(g) and carbon monoxide(g).

1. CH₄(g) + H₂O(g)3H₂(g) + CO(g)    H = 206 kJ

When 4.65 grams of methane(g) react with excess water(g),  ..... kJ of energy are (evolved/absorbed)?

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Answer 1

reaction:

CH4 + H20-------> 3H2 + CO2 delta H +206 kj

what is the the energy in kj (evolved or absorbed) when 4.65 grams of CH4 reacts with excess H20.

You notice in the equation 1 mole of methane when reacts as above releases 206 kj of energy

step 1) convert 4.65 g to moles

4.65g x 1mol CH4/16g = 0.29 moles of CH4

step 2) convert moles of CH4 to the amount of kj of energy released in relation to the # moles given.

0.29molCH4 x 206 kj/1 mol CH4 = 59.87 kj evolved.