Write any two equations to illustrate that hydrogen gas is a reducing agent​

Hydrogen as reducing agent: hydrogen donates its electrons to areduce other substances.
Examples:

•hydrogen reduces acetylene(OS= -1)to ethane(OS= -3).

C2H2+2H2--->C2H6.

•hydrogen reduces bromine(OS=0)to hydrobromic acid(OS=-1).

H2+Br2>2HBr.

•hydrogen reduces oxygen(OS= 0 )To water (OS= -2).

2H2+O2>2H2O.

V=67.2 L

Explanation:

For this problem we will need to use the Ideal Gas Law.

Ideal Gas Law: PV=nRT

P=1.00 atm (STP)

V=?

n=3.00 mol

R=0.08206Latm/Kmol

T=273.15 K (STP)

To find V, we would manipulate the equation to V=nRT/P

With significan figures, our answer is V=67.2 L.