Why are the element carbon hydrogen oxygen and nitrogen important to life on earth?

Carbon, hydrogen, oxygen and nitrogen are known as the main “organic” elements because they form the building blocks that make life possible.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

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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