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Hello students, we are given with the three pairs of substances.
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We have to suggest which substance has the higher entropy at 298 kelvin among each pairs and we have to explain our reasoning in terms of differences in temperature on energy level systems.
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Solution is as follows.
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So first system is ch4 gaseous versus sih4 gaseous.
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So at 298 kelvin sih4 gaseous should have higher entropy than ch4 gaseous.
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This is because sih4 gaseous it has a larger molecular weight and more complex structure than ch4 gaseous which means it has more degrees of freedom for translational, rotational and vibrational motion.
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As the temperature increases the translational, rotational and vibrational energy levels of sih4 will be more affected than those of ch4 gaseous.
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So this leads to greater increase in entropy for sih4.
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The next pair given is br2 liquid versus br2 gaseous...