52.3k views
4 votes
Which of the following choices would have a negative entropy change?

A. N2(g) + 3H2(g)- >2NH3(g)
B. CaCO3(s) – > CaO(s) + CO2(g)
C. H2O(s)-> H2O(l)
D. Fe2O3(s) + 3C(s)- > 2Fe(s) + 300(g)

User Amr Saber
by
8.4k points

1 Answer

4 votes

N2(g) + 3H2(g)- >2NH3(g) denotes a negative entropy change.

Step-by-step explanation:

Entropy is defined as the extent of disorder in a system. The degree of entropy is more in a gas and less in a solid.

Here, 1st reaction produces ammonia from nitrogen and hydrogen. We can see that four moles of gases produces 2 moles of gaseous product. So the degree of disorder in the system is decreasing. So the entropy is also decreasing.

User SpazzMarticus
by
8.6k points
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.