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How do you do this 1 mark a level chemistry question???

A research chemist investigates how to improve the synthesis of ethyne from methane at a high temperature. The chemist adds CH4 to a 4.00 dm3 container. The chemist heats the container and allows equilibrium to be reached at constant temperature. The total gas volume does not change. The equilibrium mixture contains 9.36 × 10–2 mol CH4 and 0.168 mol C2H2.

(i) Calculate the amount, in mol, of H2 in the equilibrium mixture.
In case you're still looking for an answer to this:

You start by writing out the balanced equation: 2CH4 <=> C2H2 + 3H2
Then you can use an initial-change-equilibrium table (they were called RICE tables at my school?) to figure out how much H2 you'd have by finding the difference between initial and final moles of ethyne :smile:

does that help?

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