Rxn =
Calculate ΔΗο. for the combustion reaction of
CH4 shown below given the following:
AHºf CH4(g) = -74.8 kJ/mol;
AHºf CO2(g) = -393.5 kJ/mol;
AHºf H2O(1) = -285.5 kJ/mol.
CH_(g) + 2 O2(g) > CO2(g) + 2 H2O(1)
=
=
A. -604.2 kJ
B. 889.7 kJ
C. -997.7 kJ
D. -889.7 kJ
E. None of the above

answer; i believe that the correct answer is (c) explore the outer planets; / plz check good luck

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 right answer is c i just did the question.