# A 12. 2 g sample of X reacts with a sample of Y to form 78.9 g of XY. What is the mass of Y that reacted?

What does it mean to say that all chemical reactions CONSERVE mass?

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To find the mass of Y that reacted, subtract the mass of X from the total mass of XY: Mass of Y = Mass of XY - Mass of X Mass of Y = 78.9 g - 12.2 g Mass of Y = 66.7 g

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