7.2.2 I can deduce the extent of a reaction from the magnitude of Kc

What does the word magnitude mean?

Magnitude is the size of something.

Explain why the three reactions below do not have units for Kc?

The three reactions do not have a unit for Kc because the sum of the number of moles of the products equals the sum of the number of moles of the reactants. 

Deduce the extent of the reaction if Kc is
a. Significantly larger than 1

The reaction is considered to go almost to completion (very high conversion of reactants into products).

b. Between 0.01 and 100

Both the reactants and products are present and are in significant amounts.

c. Extremely small

The reaction hardly proceeds (very low conversion of reactants into products).