I have an equation for this problem; however, I am unclear where the values of Q

Question

I have an equation for this problem; however, I am unclear where the values of Q and K are derived from based on the information provided.

C2H2 (g) + 2H2 (g) ----> C2H6 (g)

My study sheet says that Q = 0.1 and K = 0.25

This yields an answer of -0.916; therefore, G < 0 and the reaction is spontaneous and product favored.

I've done all the calculations for G, S, H and nowhere do I see anything that would yield a Q = 0.1 and a K = 0.25. This will be on my final exam and for the life of me I can't figure out where these two values were derived from.

Thank you in advance for taking a look either way.

Explanation / Answer

The K may be calculated for a reaction as

K = number moles of products / number of moles of reactants raised to the power number of times they appear in the balanced chemical equation.

In your case it is given as K = no. of moles of C2H6/no. of moles of C2H2 X (no. of moles of H2)2

K = 1/1X22

K = 1/4 = 0.25

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