Answer the following questions using the following information: ∆hfus=6.02 kj/mol; ∆hvap= 40.7 kj/mol; specific heat of water is 4.184 j/g∙˚c; specific heat of ice is 2.06 j/g∙˚c; specific heat of water vapor is 2.03 j/g∙˚c.

how much heat is required to vaporize 25 g of water at 100˚c?
how much heat is required to convert 25 g of ice at -4.0 ˚c to water vapor at 105 ˚c (report your answer to three significant figures)?
an ice cube at 0.00 ˚c with a mass of 8.32 g is placed into 55 g of water, initially at 25 ˚c. if no heat is lost to the surroundings, what is the final temperature of the entire water sample after all the ice is melted (report your answer to three significant figures)?
acid/base: the water constant and ph

instructions: determine if each solution is acidic, basic, or neutral.

1.[h3o+] = 1 x 10-10 m; [oh-] = 1 x 10-4 m

[h3o+] = 1 x 10-7 m; [oh-] = 1 x 10-7 m
[h3o+] = 1 x 10-1 m; [oh-] = 1 x 10-13 m
[h3o+] = 1 x 10-13 m; [oh-] = 1 x 10-1 m
instructions: calculate [oh-] given [h3o+] in each aqueous solution and classify the solution as acidic or basic.

5. [h3o+] = 2.6 x 10-3 m

6. [h3o+] = 2.6 x 10-8 m

[h3o+] = 1.6 x 10-2 m
[h3o+] = 4.3 x 10-3 m
instructions: calculate the [h3o+] of solutions a and b; calculate the [oh-] solutions c and d.

9. ph = 2.76

10. ph = 3.65

poh = 3.65
poh = 6.87
equilibrium and le chateleir's principal