Part One: Calculate the molarity of Ba2+ in an aqueous solution that contains 1.7 g of Ba(OH)2 in 0.75 L of solution. Answer in units of mol/L.

Part Two: What is the molarity of H3O+?
Answer in units of mol/L.

Explanation:

Ba(OH)2 ==>  Ba2+  +  2OH-

1.7 g = 0.008172796 moles Ba(OH)_2

1:1 for Ba2+ = 0.008172796 moles / .15L = 0.054M

2:1 for OH- = 0.016345593 moles / .15L = 0.109M

Kw = [H+] x [OH-] = 10^{-14}

10^{-14} / 0.109 = 9.2×10^{-14}  = [H+]

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.  

i'm pretty sure it is letter c.) car