Copper has two naturally occurring isotopes with atomic masses of 62.9296 u ( )and 64.9278 u ( ).The atomic mass of copper is 63.546 u.What is the percent distribution of the isotopes?
A)69.15% , 30.85%
B)30.85% , 69.15%
C)1.08% , 98.92%
D)98.92% , 1.08%
E)99.03% , 0.97%

Question

Copper has two naturally occurring isotopes with atomic masses of 62.9296 u (  )and 64.9278 u (  ).The atomic mass of copper is 63.546 u.What is the percent distribution of the isotopes?
A)69.15% , 30.85% 
B)30.85% , 69.15% 
C)1.08% , 98.92% 
D)98.92% , 1.08% 
E)99.03% , 0.97%

Quizplus · Accepted Answer

To find the percent distribution of the isotopes, we need to first calculate the relative abundance of each isotope. Let x be the percent abundance of the isotope with atomic mass 62.9296 u. Then, the percent abundance of the isotope with atomic mass 64.9278 u would be (100-x).

We can set up the following equation to solve for x:

(62.9296 u)(x/100) + (64.9278 u)((100-x)/100) = 63.546 u

Solving for x, we get:

x = 69.15

Therefore, the percent distribution of the isotopes is 69.15% 11ea69e8_d182_c9c1_b0c5_1781d5d4c8f2_TB3385_11 and 30.85% 11ea69e8_d182_c9c2_b0c5_d76d1ca539ff_TB3385_11, which corresponds to choice A.

Copper Has Two Naturally Occurring Isotopes with Atomic Masses of 62.9296