An aqueous solution of methyl alcohol (molar mass = 32.05 g/mol) is prepared by dissolving 15.0 ml of the alcohol (d = 0.792 g/ml) in 75.0 ml of water (1.00 g/ml).

a. calculate the mass % of the aqueous alcohol solution.
b. calculate the molarity of the aqueous alcohol solution.
c. if 5.0 ml of the solution (above) is diluted to a volume of 50.0 ml, what is the molarity (m) of the resulting dilute solution?

A. The mass% of the aqueous alcohol solution is 13.69%(wt/wt). The solution to this is:

mass alcohol = 15.0mL (0.792 g/mL) = 11.9 grams alcohol
mass water = 75.0mL (1.00 g/mL) = 75.0 grams water
total mass = 11.9 + 75.0 = 86.9 grams solution
mass% of methanol = (11.9/86.9)*100% = 13.69%

B. Molarity = 4.125 M

Solution:

Molarity = mole solute/L solution
mole solute = 11.9/32.05 = 0.3713 moles
L solution = 15 + 75 = 90 mL/1000 = 0.09 L

M = 0.3713/0.09 = 4.125

C. Answer is 0.4125 M

Solution:

C1V1 = C2V2
4.125(5mL) = C2(50mL)
C2 = 0.4125 M

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.