/sci/ - Science & Math

/sci/,
"how many atoms of phosphorus are in 5.60 mol of copper (ii) phosphate?"

I already know the answer (using Avogadro's number), but why can't I use the percentage by mass to figure this out?

Given percentage by mass, Phosphorus is roughly %16 of the compound. Why doesn't taking 5.60 * 6.022*10^23*0.16 work?

/sci/,
My Chem I profressor is going to be putting chemical terminology on all of our tests, so we have to actually learn it. What are some tricks you used to remember the various prefixes, suffixes, etc. There's just so many rules and I'm not good with names to begin with.

/sci/,
Could some of you chemists help me out here. I'm having trouble understanding something. We're doing balancing equations here, and while I understand that, I don't understand the equations themselves. For example, combining Magnesium with Oxygen for Magnesium Oxide: Mg(s) + O_2(g) = MgO(s)

I know this isn't balanced yet, but my question is, if we're combining Magnesium and Oxygen, why is it O_2(g) and not O(g)? And further more, depending upon the first questions answer, I may ask why is the result MgO(s) and not MgO_2(s)?

Is this something they can't explain now? Or is it something I've looked over?

I have a theory about the first one, that for some reason Oxygen is represented as a molecule in the air rather than the element itself. If that is the case, then I'm still left with question 2.

>mfw Chemistry

>>THIS WHOLE FUCKING THREAD

>I want the women that I love to believe that they deserve to be seen as I see them: The reason anyone wakes up in the morning.

This is bullshit, my blood pressure is going through the roof!

Do we exist on a 3 dimension plane or a 4 dimensional plane?

http://www.youtube.com/watch?v=j2OKucAayD8&feature=player_embedded

>32:25
>mfw

>>2471272
there's nothing to show that "changing behavior as they see fit" wasn't influenced by some previous sequence of events

first you have to solve the problem of having people live on an object with a different gravitational force

>>2252196
>>2252197

Shh, this guy is going to get mad. >>2252186

>His face when he read it.

WHAT THE FUCK IS THAT.

/sci/ this problems been bugging me all day:

>"a 2 mile cab ride cost 5.45$, and a 5 mile ride cost 10.75$, write an equation to model the situation"

dude, the fuck? please help

>>1996688
>Etcetera, etcetera.

>speed of an instant

There's a discussion on this in /new/ Unscientifically retards, the lot of them.