Skip to content
dronacharya.ai
← IIT-JEE 2009 · Paper 1
ChemistrySingle correct+3 / -1Question 1 of 60

IIT-JEE 2009 · Paper 1, Chemistry question 1

Given that the abundances of isotopes 54^{54}Fe, 56^{56}Fe and 57^{57}Fe are 5%, 90% and 5%, respectively, the atomic mass of Fe is

Choose one option
Answer and worked solution

Official answer: B

Weighted average.
0.05(54)+0.90(56)+0.05(57)=2.70+50.40+2.85=55.95.0.05(54)+0.90(56)+0.05(57)=2.70+50.40+2.85=55.95.

(B)

Topics:Mole conceptElectronic configuration
Next question →