Which reaction is a double displacement reaction? Question 25 options: A) 3 Mg + Fe2O3 → 2 Fe + 3 MgO B) 2 KBr + Cl2 → 2 KCl + Br2 C) 2 H2 + O2 → 2 H2O D) 3 Ca(OH)2 + Al2(SO4)3 → 3 CaSO4 + 2 Al(OH)3​

h let me think

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