Homework Statement
(Idk how to put in the equation to make sense, therefore it is at the link below)
Homework Equations
The Attempt at a Solution
Here is all I have done. Something just isn't right...there should be 3 answers (in the back of the book) because there is a cube...
I used the pythagereon therom.
a^2+b^2=c^2
b^2=c^2-a^2
b^2=6^2--1^2
b=sqr37
wouldn't I have to take the square root of 35/36 using pythag id to get sin(x)?Edit:Ok, I got the correct answer, but I don't undestand why the pythag therom did not work...
Homework Statement
(x=theta for typing here)
Find exact values of sin2x, cos2x, and tan2x when sec(x)=-6; 90degrees<x<180degrees
Homework Equations
sin(2x)=2sinxcosx
etc..
The Attempt at a Solution
If I can figure out what I am doing wrong for just sin(x) I should be good to...
Homework Statement
An atmospheric chemist fills a gas-reaction container with gaseous dinitrogen pentaoxide to a pressure of 130. kPa, and the gas decomposes to nitrogen dioxide and oxygen. What is the partial pressure of nitrogen dioxide, PNO2, (in kPa) when the total pressure is 166 kPa...
Ok, I came up with 27279.97791 J/mol corrected to 27000 J/mol for sig figs, but Webassign says I am wrong, and within 10% of the correct answer. "Your answer is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all...
E[SIZE="1"]a=-R(ln k[SIZE="1"]2/k[SIZE="1"]1)[(1/T[SIZE="1"]2)-(1/T[SIZE="1"]1)]^-1
E[SIZE="1"]a=?
T[SIZE="1"]2=363.0K
T[SIZE="1"]1=372.0K
time1=336s
time2=270s
R=8.314 J/mol*k
Do I plug in the times for k? I am attempting it now, it looks as if it should still all cancel and leave me with...
Homework Statement
In Houston (near sea level), water boils at 100.0°C. In Cripple Creek, Colorado (near 9500 ft), it boils at 90.0°C. If it takes 5.6 min to cook an egg in Cripple Creek and 4.5 min in Houston, what is Ea for this process?What I do not understand is how I can figure this when...
In preparation for a demonstration, your professor brings a 1.2 L bottle of sulfur dioxide into the lecture hall before class to allow the gas to reach room temperature. If the pressure gauge reads 78 psi and the lecture hall is 23°C, how many moles of sulfur dioxide are in the bottle? (Hint...
How many moles and numbers of ions of each type are present in the following aqueous solutions?
3.26 L of a solution containing 6.96 x 10^21 formula units of lithium nitrate per liter
I got 1.16e-2 mols of Li and NO3 as well as 6.99e21 ions for each. The software I am using (webassign) says...