Question

A scientist finds that one volume of an unknown gas X combines with 2 volumes of another gas Y to form 2 volumes of a new gas with a formula XY2. What is the balanced equation?
Are these two monatomic gases?
X + 2Y ==> XY2 doesn't work.Not 2 volumes XY2.

Are these diatomic gases?
X2 + 2Y2 ==> 2XY2 looks ok.

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