Question

if you answer it correctly you will be marked as brainalist..​

Answer 1

Answer:

s will be 35

Explanation:

law of combination reaction

two or more than two reactants with each other to form single product

Answer 2

Explanation:

according to law of conservation of mass ,

mass of reactant=mass of products

mass of p +mass of q=mass of r+mass of s

20+30=15+mass of s

50-15=mass of s

mass of s=35 g

(ii) law of conservation of mass