Chemistry
Calculate Activation Energy, Ea, for each of the reactions, above? ln(k)= -2.24x10^4(1/T)-1.8. The reactions are Step 1: 2H2 + N2 -> N2H4, Step 2: N2H4 + H2 -> 2NH3, Overall: 3H2 + N2 -> NH3. This is all the information i have. i Don't know how to solve for the Ac...
Math
(-3xy^2)^2(-2x^5y^3)^3
Literature
In order to get an idea of significant subject areas in a chapter, it is best to read the: A. subheads. B. graphics. C. captions. D. table of contents.
Physics
nearly everybody has witnessed a lunar eclipse, but relatively few people have seen a solar eclipse? why
Math 7th Geometery
yes hieght is 12m Yes 3 rectangles. yes two outside ones equal 31 by 23 Yes smaller one at the base is 23m Yes all right. your awesome! This was a tough one for me. But you helped me see where I was confused. Thank you so much.
Math 7th Geometery Anyone help?
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Math 7th Geometery
I have a complex figure like a U shape. I understand the formula for this is l x w = a Can you show me the steps? 31m is parael to 31m this would be the height (sides of the U)?? or is this the width? Length 69m Width is on the right top of U 23m. Inside the middle of the U23...
chemistry
What is the molar concentration of sodium ions in a 0.450 M Na3PO4 solution?
Trig
Thank you very much!
Trig
How exactly do you get there though? I tried to follow a similar homework problem and got: = (cos^2)*(67.5deg) - (sin^2)*(67.5deg) = cos(2*67.5deg) = cos135deg = -√2/2
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