Posted by Eric on Friday, September 3, 2010 at 2:55pm.
This is my first time taking chemistry and I am VERY VERY confused
On the step involved to find out how many calories to warm 58mL of water from 10 degress C to 100 degress C and vaporize it at 100 degress C.

College chemistry  DrBob222, Friday, September 3, 2010 at 5:15pm
q1 = heat to warm water from 10 to 100.
q1 = mass x specific heat x (TfinalTinitial) where Tf is 100 and Ti is 10 (or delta T = 90).
q2 = heat to vaporize liquid water at 100 to vapor at 100 C.
q2 = mass water x heat vaporization
Total q = q1 + q2.

College chemistry  Mickelle, Wednesday, May 18, 2011 at 11:06pm
Which is faster, a bullet with a velocity of 1100. feet per second, or Superman traveling at 1100. miles per hour? Provide the correct velocity for either Superman or the bullet in scientific notation with the correct number of sig figs. You must use the following conversion factors: Density = m/V; 1 L = 1000 mL; 1 L = 1.057 quarts; 1 gallon = 4 quarts; 1 mile = 5280 feet; 1 foot = 12 inches; 1 inch = 2.54 cm; 1 meter = 100 cm; 1 kilometer = 1000 m; 1 g = 0.03527 oz; 1 lb = 16 oz
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