Use the equation c6h6 +cl = c6h3cl + hcl what is the theoretical yield of c6h6cl if 22.8 if c6h6 react

Write the balanced equation- 
C6H6 + Cl2 --> C6H5Cl + HCl 
1 mol C6H6 reacts with 1 mole Cl2 to yield 1 mole of C6H5Cl 

Calculate the moles of each reactant- 
36.8 g C6H6 / 78.1 g/mol = 0.471 mol C6H6 
36.9 g Cl2 / 70.9 g/mol = 0.520 mol Cl2 
0.471 mole C6H6 requires 0.471 mole Cl2. You have excess Cl2 so C6H6 is limiting. 

0.471 mole C6H6 will yiels (at 100%) 0.471 mole C6H5Cl 
0.471 mol x 112.5 g/mol = 53.0 g C6H5Cl 

38.8 g actual / 53.0 theoretical = 0.732 (73.2% yield) 

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.