Question

In a chemical reaction, 300 grams of reactants are combined with 100 grams of reactant

b. both a and b react to completion. how much will the product weigh

Answer 1

400 grams

Step-by-step explanation:

The law of conservation of mass states that, in any closed system, the mass of the system must remain constant. Hence, if the total mass of the reactants in a system is 200g, after reaction, the mass of the products will have to be 200g. And if the mass of the product formed is less than 200g (for example 170g), it means some reactants are yet to react and will hence take the remainder (the remaining 30g) since the system must maintain the same mass (200g) throughout.

The question indicates that a reactant (a) weighs 300 grams and another reactant (b) weighs 100 grams, the total mass of the reactants will be 400 grams and when the reaction is completed, 400 grams of products must be formed in accordance with the law of conservation of mass as explained earlier.

Answer 2

I believe the mass of the product will be 400 grams. This is because according to the law of conservation of mass, mass is neither created nor destroyed . In a closed system, the mass of reactants is equal to mass of products. Therefore, since the total mass of the reactants is 400 grams then the mass of the products will still be 400 grams