The table shows four reactions Which of the following is an example of a combustion and also a synthesis reaction

A. 1
B. 2
C. 3
D. 4

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

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

5.6⋅10−^19  j

do you need the explaination?