Which best defines partial pressure in a mixture of gases? pressure that is exerted by all the gases of a mixture on the container pressure that is exerted by one gas as if it occupied a container by itself half of the pressure that is exerted by the gases of a mixture on the container sum of the individual pressures that are exerted by two or more gases

Answer;

Pressure that is exerted by one gas as if it occupied a container by itself

Explanation;Partial pressure refers to the pressure exerted by an individual gas in a mixture of gases.According to Dalton's law of partial pressure, the total pressure of a mixture of gases is equivalent to the sum of the partial pressures of the component gases.Therefore; The partial pressure of one gas in a mixture of gases, contained in a given volume, is the pressure that one gas would exert if it occupied the entire volume all by itself.

B.1 - hydrogren-1 can only mean there is 1 neutron. it's obvious there is 1 proton or else it wouldn't be hydrogen, so they wouldn't put a number after it unless they were indicating the number of neutrons