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JEE Advanced 2009Paper 1

Exam: JEE Advanced
Year: 2009
Paper: Paper 1
Subject: Chemistry
Chapter: Structure of Atom

JEE Advanced 2009 · Paper 1 · Chemistry · Structure of Atom

Given, that the abundances of isotopes, _ 54 Fe, _ 56 ~F and _ 57...

Given, that the abundances of isotopes,

{ }_{54} \mathrm{Fe},{ }_{56} \mathrm{~F}

and

{ }_{57} \mathrm{Fe}

are

5 \%

,

90 \%

and

5 \%

, respectively, the atomic mass of

\mathrm{Fe}

is

Options

A $55.85$
B $55.95$
C $55.75$
D $56.05$

Correct answer

B. $55.95$

Step-by-step solution

Average atomic weight

\frac{54 \times 5+56 \times 90+57 \times 5}{100}=

55.95

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