For the given reactions, classify the reactants as the reducing agent, oxidizing agent, or neither.
F2 + H2 > 2HF
2Mg + O2 > 2MgO

For , is the oxidizing agent and is the reducing agent.

For , Mg is the reducing agent and is the oxidizing agent.

Explanation:

An oxidizing agent is defined as the substance which tends to oxidize other substances by itself gaining electrons. As a result, there will occur a decrease in its oxidation state.

On the other hand, a substance which tends to reduce other substances by itself losing electrons is known as an reducing agent. There will occur an increase in oxidation state of a reducing agent.

For example,

Oxidation:

Reduction:

Hence, here is the oxidizing agent and is the reducing agent.

Also,

Oxidation:

Reduction:

Hence, here Mg is the reducing agent and is the oxidizing agent.

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.