Question

Which answer is NOT a measure of the amount of matter?

Answer 1

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 $^{12}\textrm{C}$ 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.

Answer 2

Answer:

mole

Explanation:

All of the other ones are measuring systems