Duffy

Calculate the pH of the resultant solution when 40.00 mL of 0.250 M H2SO4 are mixed with 30.00 mL of 0.450 M KOH. The answer says it is 1.032...I get 12.70 (and I subtract that from 14 I still only get 1.3) Thanks.

How many mL of an impure liquid CS2 mixture (density 1.26 gmL-1) which contains 93.0% of CS2 by mass, must be burned to obtain 12.8g SO2? I cannot get this question! Thanks -D

Regarding the question I posted earlier (How many mL of an impure liquid CS2 mixture (density 1.26 gmL-1) which contains 93.0% of CS2 by mass, must be burned to obtain 12.8g SO2?)>>volume is 6.49 mL what volume of pure oxygen at 25.0 degrees C and 100 kPa...

You helped me with a question, but I got stuck/didn't get the correct answer. I replied, can you have a look (under chemistry...part 2). Thank you!

An equilibrium reaction which has K1 = 6.5 x 10¯2 at 100oC and has ∆Horxn = -49.5 kJmol¯1. What is the value of K at 250 oC? I can't get the right answer, which is supposed to be 6.68 x 10^-4. How does one do this? Thanks

I can't seem to get the answer (7.43) PV=nRT 100V= 0.107334995 (8.314) (298.15) V= 2.66 Any ideas?

Should be 100 degrees C and 250 degrees C

As BC is perpendicular to AB, being a right angled triangle. The gradient of BC would be -2. For the equation of BC, y-2=-2(x-7) y-2=-2x+14 2x+y=16 Then put C(k,4) as x and y, 2(k)+(4)=16 2k+4=16 2k=16-4 2k=12 k=6