[lykzomg]

If the mole ratio is 1:1, and 1,3-butadiene is the limiting agent (of 1.26 mols), why isn't it

1.26 * (140 which is the molar mass of the product) * 0.864

To get an answer of 152g?

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[thetada]

You've worked out the actual mass of the product made. The last step is to subtract that figure from the total mass of the reactants.

[lykzomg]

Thanks for the reply.
So I guess we are considering the unreacted starting materials as waste. I should have read the question a bit more carefully >.>

[thetada]

It happens! As long as you're careful during the real exam =)