Sunday
May 19, 2013

# Posts by Kelsey

Total # Posts: 442

math
Express this ratio as a unit rate \$2.40 per dozen

math
1 -1/6

math
A contactor is making preparations to re-tile the border around a swimming pool. The pool measures 60 feet by 30 feet. The border extends 1 foot from each side of the edge of the pool. The contractor is going to use that are 0.25 feet squared. A case of tiles contains 50 tiles...

math
How many people would it take to produce a human pyramid 12m tall? Give various methods

Geometry
the angle of depression from D to F measures 40 degrees. If EF= 14 yd, find DE. round answer to nearest 10th

math
John wants to put a lace edge around a square piece of cloth. If the cloth is 4 inches wide on one side, how long of a piece of lace should Melina cut?

Chemistry
Use your value for the heat of neutralization, ∆H, -9490, to determine the amount of heat evolved when 10.00mL of 0.4091 M HCL reacts with 10.00mL of 0.4037 M NaOH.

Chemistry
yes, Al3+ sorry. so the moles=.01380. Could you help with the equation?

Chemistry
0.3724 g x 26.98MW = 10.05 mol -538.4kJ x 10.05 mol = -5410 kJ/mol 5410 kJ/mol of heat is evolved?????

Chemistry
The standard enthalpy of formation of Al3-(aq) is -538.4kJ/mol. How much heat is evolved when 0.3724 g of Al(s) reacts with excess hydrochloric acid?

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