Homework Statement
I've completed an experiment where the dependence of magnetic field strength ##B## on current ##I## is measured at the midpoint along the axis between two Helmholtz coils (separation distance = coil radius ##r##). I got the expected linear relationship from the data but am...
I'm having a difficult time understanding why the internal resistance of the EMF source is disregarded in this problem.
1. Homework Statement
You are asked to determine the resistance per meter of a long piece of wire. You have a battery, a voltmeter, and an ammeter. You put the leads from the...
Yes! That's it, thank you so much! You wouldn't believe how long I spent tearing my hair out over this yesterday. Learning is hard. :redface:
I'm a bit confused about something I think. I've learned that the rate of formation of product = - rate of consumption of reactant (which makes sense)...
I'm trying to solve one of the problems in my textbook (Atkins Physical Chemistry) and I just can't get it out. Here's the problem:
"The data below apply to the formation of urea from ammonium cyanate. Initially 22.9g of ammonium cyanate was dissolved in enough water to prepare 1.00 dm3 of...
Homework Statement
Calculate the radius of a 1.3 Msun white dwarf using the mass-radius relation for white dwarfs. Give the answer in solar radius.
Homework Equations
Mass-radius relation: $$R \propto M^{-\frac{1}{3}}$$
The Attempt at a Solution
So I've tried the following:
$$R_{D} \propto...
Ok, so basically I'm scuppered by the low yield - that's what I suspected. Thanks for your input @Borek & @BvU , was good to think through the problem regardless :)
Thanks for the response! So there are 2 moles C5H8O2 per mole of VOSO4.xH2O, which tells me that
The Na2CO3 is in excess & won't affect yield
If the stoichiometric amount of VOSO4.xH2O was used, that would be (0.5 x 0.0242 mol) = 0.0121 mol of VOSO4.xH2O.
This is closest to x=2 in the formula...
Homework Statement
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I had an inorganic lab this week which involved making VO(acac)2 from VOSO4⋅xH2O. In order to calculate the percentage yield, I need to work out x, that is, the number of water molecules coordinated with the vanadyl sulfate n-hydrate before the reaction. I'm stuck...
So by multiplying the formula by ##r## in order to start the index at 1 instead of 0, it becomes ## \sum_{n=1}^{\infty} \frac {ar} {1-r} ## where ##a = a_0 = 1## for both series (because when summing a geometric series from ##n=1##, the first term is ##a_1 = ar##). The sum of each series is...
Ah ok, my mistake. Thank you all for pointing that out, I didn't realize the formula would change if the index changed, though of course that makes sense. Cheers!
Yes! Ok! This is making sense now. So the safest thing to do is to put the quadratic in a form where the coefficient of the x2 term is 1 before applying the quadratic formula, so you don't lose track of any constant factors while finding the roots. That's exactly the insight I was looking for...