The temperature of an open room of volume 30 m³ increases from 17°C to 27°C due to the sunshine. The atmospheric pressure in the room remains 1 x 10⁵ Pa. If n, and n, are the number of molecules in the room before and after heating, then n_{i ,}n_f will be:

A -2.5 x 10²⁵

B -1.61 x 10²³

C 1.38 x 10²³