When there is a decrease in the pressure or an increase in volume. As the container gets bigger, it will want to increase the pressure to get back to equilibrium. For that to happen, it will have to increase the number of gas moles, and since co2 is the only has in that equation, it will increase.
Gas is a substance that will not phase change.
And vapor is a substance above it's boiling point temperature.
Answer:

Explanation:
Density is found dividing mass by volume. In this case, we treat krypton as a sphere having a volume of
. Given:


We obtain density of:


This is not a feasible value for a gas like krypton, its radius is actually not 110 pm.
Answer:
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Well, according to the law of conservation of mass, the total mass of the reacting atoms must equal the total mass of the final rearranged products produced through the reaction. Assuming that both products are the only products produced, it would constitute the total matter produced, and since each product has a mass of 25 grams each. The total would be 50 grams. Thus the total mass of the reactants also would need to be 50 grams, as no matter is lost in a chemical reaction.