What can you determine about the feasibility of a reaction if the enthalpy is positive and the entropy is positive?
A. The reaction will usually occur because it is unlikely the entropy will be greater than the enthalpy.
B. The Gibbs energy will always be positive, and the reaction will never be feasible.
C. The Gibbs energy will always be negative, and the reaction will always be feasible.
D. The reaction could be feasible above a certain temperature.

I think the anwers is A

what is the volume occupied by 40 grams of argon gas (ar) at standard conditions? what volume, in liters, is occupied by 1.5 x 1023 

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.