Recent content by gunnar

Hi. I got some questions I need to answer. Just to make sure I'm correct I would appreciate if someone could comment on my answers. 1. Q. When calculating the theoretical yield of an alum that has water molecules attached to the double salt. Are these included in the calculation? A. I...

I solved for x and still don't get it right. I got the pressure of SO2 to be 5,6e-5 atm from the information I got. Used P=nRT/V Since SO2 is 0,16 ppm it must be 0,16 mg in one liter I assume STP conditions. And I got the MW of SO2 to be 64,07 g/mol Am I wrong?

OK. I treated them as to be the same conc. But how can I get the pressure of SO2?

Hi, can someone please give me a hint to this problem? The concentration of SO2 in the troposphere over a certain region is 0,16 ppm by volume. The gas dissolves in rainwater as follows: SO2(g) + H2O(l) >> H+(aq) + HSO-3(aq) Given that the equilibrium constant for the preceding reaction is...

It works. Thanks a lot

a gas is x ppm by volume Liquids are mg/L but what about the gas?

Thanks Daniel. I did what you told me, if I got it right I still didn't get the right answear. Calculated the density of air and N2 in STP multiplied by 100 and 78.03 respectively. the difference was about 0.5 something. multiplied with the mass of air whis is 5,266e18 Kg. Should get 3,96e18 Kg...

Hi. Can someone give me a hint to how to calculate total mass of nitrogen in the atmosphere. I've calculated the mass of all the atmosphere, I got the percent by volume of nitrogen to be 78.03 %. I converted the mass of the atmosphere to Liters. I got the volume of nitrogen to be 3.18e21 L and...

Worked out fine. Thanks a lot :smile:

there are 2.0e-8 M NaOH in water. I have to calculate the pH of the solution considering the OH from the water. The answear to this is pH=7.04 I know this is calculated with the quadratic equation. what I don't get is how to set this up. I alway get a wrong answear. Can somone help me with this?

did that. And put A(inverse)* [a b;c d] = C*A(inverse)

I would appreciate if someone could help me with this one. Matrix A=[1 0 ; 1 1] I need to find all matrices that satisfy: AB=BA How can I find them? PLease help :cry:

O.K I figured out that the angle between the given vectors is 60 degrees or pi/3 The angle between the unit vectors and each of the given vectors is supposed to be pi/3 also. So I used the dot product to calculate c=sqrt(2) since the unitvector has length 1 and both the given vectors have...

There are two vectors (1,0,-1) and (0,1,1) I need to find all the unit vectors x in R3 that make an angle of pi/3 with each of the vectors above. Can someone please help with this problem?

thanks guys, it makes more sense to me now.