Lead(IV) nitrate is formed via a single replacement reaction between lead and nitric acid. What is the coefficient of hydrogen gas in the balanced equation?

Answer : The coefficient of hydrogen gas in the balanced equation is, 4

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

Single replacement reaction : It is defined as a reaction in which the the more reactive element replace the less reactive element.

The balanced chemical reaction will be:

In this reaction, lead is more reactive element than hydrogen so it can displace hydrogen element form its compound and form lead(IV) nitrate.

Thus, the coefficient of hydrogen gas in the balanced equation is, 4

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.