If 2 g of X reacts with 3 g of Y in a closed container, what mass of product will form?

2 g

3 g

5 g

6 g

The answer cannot be determined solely based on the given information. The mass of the product that will form depends on the chemical equation for the reaction between X and Y. The coefficients in the balanced equation will determine the mole ratios of the reactants and products, which can then be used to calculate the mass of the product formed.