Which of the following pairings of pH and hydronium ion concentration is correct? A: pH = 7.0; [H3O+] = 1 x10^–7

B: pH = 2.0; [H3O+] = 1 x10^2

C: pH = 9.0; [H3O+] = 9 x10^–9

D: pH = 3.0; [H3O+] = 3 x10^–11

the answer would be a

2b2t

explanation:

2b2t

it is b that is the answer.

percent abundance for cu-63 can be shown as:

63 x + 65 (1-x) = 62.9296

65 - 62.9296 = 2 x

x = 1.035

thus, percent abundance for cu-63 is 1.035

percent abundance for cu-65 can be shown as:

63 x + 65 (1-x) = 64.9278

65 - 64.9278 = 2 x

x = 0.0361

thus, percent abundance for cu-63 is 0.0361

the mass spectrum of cu-63 showing the intense peak as, this isotope is found in nature more abundantly around 92.38 % in comparison to cu-65 which is found 62.58 % naturally