Recent content by ducmod

Sorry but all this doesn't help me to understand and solve the whole issue. Your answers are very vague, and they leave me very confused.

Thank you very much for your reply. As to the first formula: (last value / initial value) ^ (1/(number of periods)) - 1 it is a compound average growth rate, which should give the same result as the geometric average, and I wouldn't say that it is for a sorted set of data, because "sorted"...

Homework Statement Hello! I am trying to compute the bi-geometrical mean on data that contains negatives. But before that I wanted the test the formula that accounts only for positive values using the sum of their logarithms. By doing so I don't get the result I compute by using the "usual" geo...

I understand that it is a very easy exercise, and I have no idea why I am stuck (especially after solving around a hundred exercises after this chapter in texbook). I hope to solve it. Please, allow me to start again, but from the place where I have found the moles of H3O and OH. Given: HCl +...

I think I understand now, and see what has caused my confusion. Thank you!

2 moles. There are 3 moles of OH- produced by dissociating both NaOH and Sr(OH)2, and two of those come from dissociating Sr(OH)2

Thank you for your reply! I am confused by the idea that no matter how much of carbon we add, the density stays the same. How can this be? Or am I reading the passage incorrectly?

Homework Statement Hello! Here is the quote from the chemistry textbook by Tro: However, since carbon is a solid, its concentration is constant—it does not change. Adding more or less carbon to the reaction mixture does not change the concentration of carbon. The concentration of a solid...

Homework Statement Hello! I am trying to solve the following problem: A 4.00-L base solution contains 0.100 mol total of NaOH and Sr(OH)2 . The pOH of the solution is 1.51. Determine the amounts (in moles) of NaOH and Sr(OH)2 in the solution. Homework Equations 3. The Attempt at a...

Sorry, but I don't see it. If I have 0.003125 moles of HCL, then I need also 0.003125 moles of NaOH. The molarity of NaOH is 0.0500, so I need 0.0625 liters of NaOH for this reaction. 0.125 l of HCl + 0.0625 L of NaOH gives total 0.1875 liters of solution, in which there are 0.003125 moles of...

thank you very much for taking time to check this. I was panicking a bit, because it seemed so wrong and I couldn't figure out why. A = 15, B = 10, C = -4 And the answer is: 3/x + 2/x^2 - 4 / 5(x - 1) Thank you!

sorry, it's a typo; +16 instead of -68 in the denominator, but all calculations are based on +16 value

Homework Statement Hello! Here is my second post on the subject partial fraction decomposition. The subject looks pretty easy to learn, but when I try exercises, I do not get to the correct answer. Please, take a look at the exercise below and help me to see my mistakes. Homework Equations...

Homework Statement Hello! I am doing a chapter on partial fraction decomposition, and it seems I do not understand it correctly. Here is the exercise doing which I get wrong answers. Please, take a look at the way I proceed and, please, let me know what is wrong in my understanding. Homework...

I agree ) Thank you.