Question

What will be the molar volume of nitrogen and argon at $273.15$ K and $1$ atm ?
(A). $12.4,22.4$
(B). $22.4,22.4$
(C). $11.2,11.2$
(D). $10.2,22.4$

Answer 1

For the calculations, we need certain quantities. Some quantities are universally accepted like the gas constant, Avogadro number, acceleration due to gravity and many more. In terms of gases and liquids scientists have introduced two systems namely S.T.P stands for standard temperature pressure and N.T.P stands for normal temperature pressure.

Complete answer:
Measurement is the process in which the physical quantities are represented in numerical terms with units.
S.T.P stands for standard temperature pressure and N.T.P stands for normal temperature pressure.

The Metric System

Prefix| Symbol| Exponential
Yotta| Y| ${10^{24}}$
Zetta| Z| ${10^{21}}$
Exa| E| ${10^{18}}$
Peta| P| ${10^{15}}$
Tera| T| ${10^{12}}$
Giga| G| ${10^9}$
Mega| M| ${10^6}$
Kilo| K| ${10^3}$
Hecto| h| ${10^2}$.
Da| da| ${10^1}$
Gram/Meter/Sec| g/m/sec| ${10^0}$
Deci| d| ${10^{ - 1}}$
Centi| c| ${10^{ - 2}}$
Milli| m| ${10^{ - 3}}$
Micro| $\mu$| ${10^{ - 6}}$
Nano| n| ${10^{ - 9}}$
Pico| p| ${10^{ - 12}}$
Femto| f| ${10^{ - 15}}$
Atto| a| ${10^{ - 18}}$
Zepto| z| ${10^{ - 21}}$
Yocto| y| ${10^{ - 24}}$

Concentrations are represented in different ways like molarity, molality, percentage, parts per million, formality, normality and many more.
STP are the set of conditions in which the relation between temperature, pressure and their numerical terms are suggested. However, the values of STP and NTP are not universally same, and not historically were the same.
However for the calculations of thermodynamics, Carl S helrich and guid used the values of the STP. Thus giving it more value than the other standards like NTP and NIST.

The correct answer is (B). $22.4,22.4$

Note:
STP has the temperature equal to zero degree Celsius or in Kelvin equals to $273.15$ , with $0.987$atmospheric pressure or $101.3$ kilopascals or $760$ mmHg. Whereas in NTP the temperature in terms of Kelvin is $293.15$ and the pressure is one atmosphere. Both the systems are important in chemistry as some scientists use one medium for calculation and some use another medium.