Recent content by Paul Black

Thank you for your help Will see if this book has more mistakes.

First time I see an error in a book. So in that case all the internet pages that have the same question+solution made the same mistake. Do they just copy past ?

Hello everyone I am trying to solve the following question from the book Analytical Chemistry 7th edition by Gard D. Christian - Page 164 Example 5.17 My problem is when I calculate the molecular weight of Pb(NO_3)_2 I get 331.2 g/mol but in the book they get 283.2 g/mol . Could you explain...

Ok. Thank you for your help

i checked it but didnt find any errors

omg that is so embarrassing sorry but I am out of time. that's is the reason for my stupid mistake i get it and have again my solution in an attachment yes you are soooo right. thank you again

sorry but i don't get it. can you explain it more. i thought my formula is correct or is there something is forget? what about the rest of the solution please if you have time, can you give me the complete solution to this question i have tomorrow an exam and i have no time please do me this...

hello i have this question " a liquid has refractive index (n). find the refractive index of this liquid for an observer if the liquid have a velocity (v) to this observer " i have my solution in an attachment please look at it and tell me if it is the right solution thank you...

ok thank you very much

thank you for your answers if i take a special function which satisfy the property then is my solution ok?

hello i have to proof that Px (linear momentum operator ) is hermitian or not i have added my solution in attachments please look at my solution and tell me if its correct thank you all

thank you i got it finally thank you very much

xox thank you very much. i get it so now i have to divide both sides by dt to get du/dt=a but again with this gamma. eq 1.11 i don't understand it

yes you are right sorryyyy this gamma confused me xD

xox thank you for your answer but I am sorry you are wrong the positive sign is wrong. it must be negative therefore the only one error is the square in the denominator but this is not my problem. i just want to know how to get the next step with gamma square. hope you can help me