Answer: 
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
The balanced chemical reaction for nitrogen and hydrogen react to form ammonia:
(1)
The balanced chemical reaction for ammonia and oxygen react to form nitric acid and water:

(2)
The net chemical equation for the production of nitric acid from nitrogen, hydrogen and oxygen by adding 1 and 2

Magnesium salt is the type of substance
Answer:
True. They engage in many different activities and sequences
It’s g cause it’s closest to 10 which would make 40