Astudent is monitoring the pressure of a gas in a rigid container. the amount of gas particles and the volume of the container are held constant. how will the pressure be affected if the container is cooled over time?

a. the gas pressure will decrease.

b. the gas pressure will increase.

c. the gas pressure will remain constant.

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

the formula mass of a molecule or a compound is the sum of the atomic weights of the atoms in its empirical formula

(that's what i know about formula mass)