A substance formed as a result of a chemical reaction

In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B have?

In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?

If reaction starts with 20g of reactants it should produce

A homogeneous mixture of a solvent and one or more solutes.

The part of a solution that is usually present in the largest amount and dissolves a solute (ex. water of soft drink)

The part of a solution that is dissolved by a solvent (ex. sugar of soft drink)

1000 g of a solution have to be prepared out of 250 g of salt. How much water will you need to prepare this solution?