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Chemistry Question on Bohr’s Model for Hydrogen Atom

The energy absorbed by each molecule (A2)(A_2) of a substance is 4.4×10−19J4.4\times 10^{-19} J and bond energy per molecule is 4.0×10−19J4.0\times 10^{-19} JThe kinetic energy of the molecule per atom will be

A

2.0×10−20J2.0\times 10^{-20} J

B

2.2×10−19J2.2\times 10^{-19} J

C

2.0×10−19J2.0\times 10^{-19} J

D

4.0×10−20J4.0\times 10^{-20} J

Answer

2.0×10−20J2.0\times 10^{-20} J

Explanation

Solution

KE=4.4×10−19−4.0×10−19KE =4.4 \times 10^{-19}-4.0 \times 10^{-19} KE/KE / molecule =0.4×10−19=0.4 \times 10^{-19} KE/atom =0.4×10−192=\frac{0.4 \times 10^{-19}}{2} =2×10−20J=2 \times 10^{-20} J