Stoichiometry question


I think it is supposed to be easy and simple, but I still couldn’t approach the question. How to solve this question? The answer is D.

Hi, this is my guess!

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I still cant understand much. I prefer an answer with a reason to understand. Thank you!

Hi, so if we had 20cm3 of A and 20cm3 of B in the reactants,
we will have 20cm3 of A and 20cm3 of B in the products.

In case of products (AxBy + A), since excess gas A is 10cm3, AxBy will be addition of A 10cm3 (remaining) and B 20cm3.

Therefore x = 1, y = 2.

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