Recent content by wolfson_1123

Hi all, i often help out in the chemistry section, was wondering if you could help me with a question: A vessel of thermal capacity 500 J/oC contains 0.5 kg of water at 50oC. 0.2 kg of water at 20oC is added and perfectly mixed with the hotter water. In this process, heat is lost by the...

1 mole of a gas = 24 L (24dm^3) So you have your mass, so just change that into number of moles, then multiply by 24 L. That will find your Volume.

Just to say: The standard heat of formation (DH°f) for O2(g) is zero. Yes your calculations look fine :-)

Hi there, \mathrm{K_c} = \frac{\mathrm{[HBr]^2}}{\mathrm{[H_2] \cdot [Br_2]}} Where i = initial and f = final [H2init--][Br2init]--[2HBr2init] [0.340--][0.220 ]--[2---x---] [H2Fin--]Br2Fin ]--[2HBr2fin] [0.1396 ][0.0196]--[2---x--] /_\ = 0.2004 So 2HBr = 2 x /_\ = 2 x 0.2004...

K=39.098 S=32.060 O=15.999 So: K2=78.197 S=32.060 O4=63.998 So: K2SO4=174.254 Do the same for the other ones.

Question one: “How many grams of Mg(OH)2 (2 is a subscript) will be needed to neutralize 25ml of stomach acid if stomach acid is 0.10 M HCl?” Display reaction equation (balanced) (Step 1) Mg(OH)2+2HCl-->MgCl2+2H2O 1 to 2 ratio: 25ml of 0.10 M (INITIAL CONCENTRATION BEFORE...

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CH4+ 202 --> 2H2O + CO2 CH4 = 100g 2O2 = 100g Mr of substances (one mole weighs): CH4 = 16.043g O2 = 31.999 so 2O2 = 63.998 H2O = 18.015 so 2H2O = 63.030 CO2 = 44.010. Now calculate number of moles: Number of moles = Mr / w (w = mass of substance) CH4 = 100 /...

All i can say if please use: Ma x Mb / Va x Vb transpose for what you need.

Yes it is possible and does happen, just browse yahoo and look up "superacids", you can easily have a negative pH of -1. And there are NO limits for a pH value. Wolfson.

Managed to do questions 1 and 2, just need some help on q 3. Thank you in advance Wolfson.

Do you know the pH scale? The pH of potassium cyanide will 7, No 7 is netrul, 7+ = basic, 7- = acidic. The pH of potassium cyanide will be = 11 (0.1 N aqueous solution). Use 11. pH of sodium methanoate = 8-9.5 Methylammonium chloride = 8 (0.1N)

Would appreciate anyhelp to solving any of these questions ty. 1 A diffraction grating of pitch 3 .27mm is illuminated at normal incidence with light comprised of various wavelengths. If components of wavelength 495nm, 625nm and 990nm are present find:- a) the angular positions of the...

Hello i have been able to do 7 out of 8 question on my linear motion questions, but this last question number 8, is proving difficult. I don't know whether the tutor has made a mistake (as the answers are typed at the bottom) so if you could be of help i would be very glad ty. I am using s =...