Challenge Problem:
The element europium exists in nature as two isotopes: 151Eu has a mass of 150.9196 amu, and 153Eu has a mass of 152.9209 amu. The average atomic mass of europium is 151.96 amu. Calculate the relative percent abundance of the two europium isotopes.
Hint: what do you know about the sum of the two percent abundances?
*The answer isnt 33 and 67 or 52 and 48. *
2007-03-17 12:03:11 · 4 answers · asked by ♥ReKa♥ 2 in Science & Mathematics ➔ Chemistry
X + Y = 100 ==> Y = 100 - X
150.9196 * (X) + 152.9209 (100 - X) = 151.96
X = 0.478 ==> Y = 0.522
150.9196 * 0.478 = 72.140
152.9209 * 0.522 = 79.825
72.140 + 79.825 = 151.965
151 Eu = 47.8 %
153 Eu = 52.2 %
2007-03-17 13:59:31 · answer #1 · answered by Richard 7 · 9⤊ 0⤋
X + Y = 100 ==> Y = 100 - X
150.9196 * (X) + 152.9209 (100 - X) = 151.96
X = 0.478 ==> Y = 0.522
150.9196 * 0.478 = 72.140
152.9209 * 0.522 = 79.825
72.140 + 79.825 = 151.965
151 Eu = 47.8 %
153 Eu = 52.2 %
2007-03-17 23:13:26 · answer #2 · answered by 2 Minutes ago 1 · 0⤊ 2⤋
lawl you guys have professor waugh too
2007-03-21 00:19:38 · answer #3 · answered by Smartest Man In The World 1 · 0⤊ 0⤋
omg!
2007-03-17 23:09:26 · answer #4 · answered by brianna<3 4 · 0⤊ 0⤋