Sample Of Welcom Address In A Program What Is The Average Atomic Mass Of Element X If A Sample Is Composed Of 85% 127 X, 12% 130X, And 3% 128 X?
What is the average atomic mass of element X if a sample is composed of 85% 127 X, 12% 130X, and 3% 128 X? - sample of welcom address in a program
Somebody help me, teach me this problem.
a. 129.0amu
b. 127.4amu
c. 127.0amu
d. 128.3amu
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2 comments:
Simply multiply the number of mass fraction, thus:
(0.85 * 127) + (0.12 * 130) + (0.03 * 128)
= 127.39
Now we look at the periodic table to find the element whose mass (number of "top") is closest to this value. What I see, it seems that you, tellurium. Then X is tellurium.
* Edit: Woops, lol. . The answer is b), if the monitoring of 127.39.
Step 1: Find the average atomic mass, atomic weight multiplied by the specified percentage, then add the results. In your case, you should
X = .85 (127) + .12 (130) + .03 (128) = 127.39 AMU, so your answer is B. 127.4 urn.
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