A solid mass of 25 g is mixed with 60 g of a solution. A chemical reaction takes place and a gas is produced. The final mass of the mixture is 75 g. What is the mass of the gas released?

The mass of the gas released can be calculated using the law of conservation of mass. This law states that the total mass of the reactants before a chemical reaction is equal to the total mass of the products after the reaction.

Here are the steps to calculate the mass of the gas:

1. First, add the mass of the solid and the solution before the reaction. This gives you the total mass before the reaction. So, 25 g (solid) + 60 g (solution) = 85 g.

2. Then, subtract the final mass of the mixture after the reaction from the total mass before the reaction. This will give you the mass of the gas that was released. So, 85 g (before) - 75 g (after) = 10 g.

Therefore, the mass of the gas released during the chemical reaction is 10 g.