Answer: STP is not the measure of amount of matter.
Explanation:
Matter is defined as the substance which takes place and has some mass.
For the given options:
Molar mass is defined as the mass which is contained by 1 mole of a substance. It is considered as the unit of matter.
Mole is defined as the mass of substance that has same number of fundamental units, which are present in 12.000 g of [tex]^{12}\textrm{C}[/tex] atom. It is a unit to measure amount of a substance.
STP is defined as the standard temperature and pressure conditions. The temperature at this condition is taken as 273.15 K and the pressure at this condition is taken as 1 atm.
Molar volume is defined as the volume of 1 mole of a substance. It is also considered as the unit of matter.
Hence, STP is not the measure of amount of matter.
