Which 3 things are always equal for an atom?

Atoms always have an equal number of protons and electrons, and the number of protons and neutrons is usually the same as well.

Explanation:

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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