One volume of the gaseous element X combined with one volume of element Y?

Question

to form two volumes of gas Z. The compund Z is the only product. Which of the following statement conflict with this evidence? Show how you reach your decision.

1. when one molecule of X reacts with one molecule of Y an even number of molecules of Z are formed.

2. one molecule of Z could contain an even number of atoms in it.

3. one gram molecule of X reacts with one gram molecule of Y

4. Both molecule of X and one olecule of Y could contan an odd number of atoms

5. both one molecule of X and one molecule of Y could contain an even number of atoms.

Answer 1

X  &  Y  --> 2 Z

equations show a ratio of moles to moles,  & molecules to molecules that react,

the ratio is not the # of grams to grams