Which of the following is most closely related to the unit of time that humans call the month? a. the revolution of the earth once around the sun b. the cycle of the moon through all its phases c. the rotation of the sun once on its axis d. the rotation of the earth once on its axis

B. the cycle of the Moon through all its phases

Explanation:

Months are determined by the cycle of moon through out all its phases. In a year, the moon has different phases as its revolves round the earth and also on its own axis.

The phases of the moon shows how the moon is view from earth. These phases were studied and it was used in determining months on earth. It was observed that between one phase change of the moon as seen on earth, 29 or 30 or 31 days can pass by.

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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