The energy absorbed by each molecule (A_2) of a substance is 4.4 × 10^ -19 ~J and bond energy per molecule is 4.0 × 10^ -19 ~J . The kinetic energy of the molecule per atom will be :

Correct answer: B. 2.0 × 10^ -20 ~J gathered KE=4.4 ×10^ -19 -4.0 ×10^ -19 KE/ molecule =0.4 ×10^ -19 KE/ atom = 0.4 × 10^ -19 2 =2 ×10^ -20 J gathered

NEET 2009

Exam: NEET
Year: 2009
Subject: Chemistry
Chapter: States of Matter

NEET 2009 · Chemistry · States of Matter

The energy absorbed by each molecule (A_2) of a substance is 4.4 ×...

The energy absorbed by each molecule

\left(\mathrm{A}_2\right)

of a substance is

4.4 \times 10^{-19} \mathrm{~J}

and bond energy per molecule is

4.0 \times 10^{-19} \mathrm{~J}

. The kinetic energy of the molecule per atom will be :

Options

A $4.0 \times 10^{-20} \mathrm{~J}$
B $2.0 \times 10^{-20} \mathrm{~J}$
C $2.2 \times 10^{-19} \mathrm{~J}$
D $4 \times 10^{-19} \mathrm{~J}$

Correct answer

B. $2.0 \times 10^{-20} \mathrm{~J}$

Step-by-step solution

\begin{gathered}\mathrm{KE}=4.4 \times10^{-19}-4.0 \times10^{-19} \\ \mathrm{KE}/ \text{ molecule }=0.4 \times10^{-19} \\ \mathrm{KE}/ \text{ atom }=\frac{0.4 \times 10^{-19}}{2}\\ =2 \times10^{-20} \mathrm{ J} \end{gathered}

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