Assertion (A): At 273K and 0.5 atms pressure, 1L of `H_2` and 1L of` CO_2` contain same number of molecules.
Reason (R): Equal volumes of all gases contain equal number of molecules under the same conditions of temperature and pressure. 

Options

A. A & R are true, R explains A
B. A & R are true, R does not explain A
C. A is true R is false
D. A is false R is true

Answer

A

Explanation

`V alpha n`.