In a very good vacuum system in the laboratory, the vacuum attained was `10^-13 atm`. If the temperature of the system was `300 K`, the number of molecules present in a volume of `1 cm^3` is.

Achamber containijng a gas was evacuated till the vacuum attained was 10^(-14) m of Hg. If the temperature of the chamber was 30^(@)C, the number of molecules that remains in it per cubic metre is

A chamber containing a gas was evacuated till the vacuum attained was 10^(-14) m of Hg. If the temperature of the chamber was 30^(@)C, the number of molecules that remains in it per cubic metre is

Volume of a gas at STP is 1.12 xx 10^(-7) cm^3 .The number of molecules present in it is

Modern vacuum pumps permit to pressures down to p = 4.10^-15 atm to be reached at room temperatures. Assuming that the gas exhausted is nitrogen, find the number of its molecules per 1 cm^3 and the mean distance between them at this pressure.

An electronic vacuum tube was sealed off during an experiment at a pressure of 8.2 xx 10^(-10) atm at 27^(@)C . The volume of the tube was 30 dm^(3) . The number of gas molecules remaining in the tube are :