H2(g)+Cl2(g)→2HCl(g) As the pressure increases at constant temperature, the number of moles of HCl?Increase, Decrease, Stay the same?

Can someone me with questions 12 and 13 plz.

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.