42 at standard pressure, the total amount of heat required to completely vaporize a 100. gram sample of water at its boiling point is(1) 2.26 x 10 j (3) 2.26 x 103 j
(2) 2.26 x 102 j (4) 2.26 x 105 j

4 is the actual answer, the other answer can eat my ...

Explanation:

The answer is 100% legit answer choice 4 not 3

This is because the 2260 is 10^2 and then ^3 is increased when boiling a 100 gram

explanation:

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