Question

20g of a solution 'x' was mixed to a solution 'y' taken in a beaker. The mass of the products formed after chemical reaction was weighed as 35g. Then the mass of the solution 'y' is: __?

Answer 1

The mass of the solution y is 15g because according to the law of conservation of mass the weight of the reactant is equal to the product.
20g+y=35g
Y=35-20
Y=15g

Answer 2

Hi there !!

Law of conservation of mass states that mass can neither be created nor be destroyed in a chemical reaction.

Mass of reactants = Mass of products

Lets assume that the mass of solution y is "a " grams

Here , 20 grams of solution x reacts with "a" grams of solutions y to form 35 grams of solution "z"

Here x and y solutions are reactants and z solution is the product

x+y --> z
20 + a --> 35
a = 35 - 20 = 15 grams

so , mass of solution y is 15 grams