During a chemical reaction substances called reactants During a chemical reaction substance called reactants are combined to form a new substance called products which of the following are currently describes reactions and products of a chemical reaction

During a chemical reaction, substance called reactants are combined to form a new substance called products.

this sentence describes reaction and products of a chemical reaction

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.