Mole ConceptHard
Question
An element X has three isotopes X20, X21 and X22. The percentage abundance of X20 is 90% and average atomic mass of the element is 20.18. The percentage abundance of X21 should be
Options
A.2%
B.8%
C.10%
D.0%
Solution
$20.18 = \frac{20 \times 90 + x \times 21 + (10 - x) \times 22}{100} \Rightarrow x = 2$
Create a free account to view solution
View Solution FreeMore Mole Concept Questions
From 2 mg calcium, 1.2 × 1019 atoms are removed. The number of g-atoms of calcium left is (Ca = 40)...A quantity of 1 kg of 1 m glucose solution is diluted to 5 kg. The molality of the diluted solution should be...The fractional abundance of Cl35 in a sample of chlorine containing only Cl35 (atomic weight = 34.9) and Cl37 (atomic we...Total number of electrons present in 4.4 g oxalate ion (C2O4 2–) is...An amount of 0.3 mole of SrCl2 is mixed with 0.2 mole of K3PO4. The maximum moles of KCl which may form is...