#1
I picked up the flu(probably from the gym;seriously, guys at the gym are disgusting) last week and I missed quite a bit. I seriously need help with some Chemistry, just in Stoichiometry (i think i spelled it right) and empirical formulas. I greatly appreciate it.
Last edited by Ablast at Feb 13, 2014,
#2
Quote by ChucklesMginty


Let's cook.

That's not flu by the way, I poisoned you with Ricin. You'll be dead this time tomorrow.

You told me what it was. So I can go to the hospital and tell them it was Ricin haha
#3
Ask questions. I'm not going to prepare a lecture for you.
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LET'S GO BUCKS
#4
Well the study guide has a few practice problems, one is:
For the following chemical reaction, how many moles of sodium sulfate will be produced from 33.7g of sodium hydroxide.
2NaOH + H(sub)2SO(sub)4 --->Na(sub)2SO(sub)4+2H(sub)2O
#5
1) Use the molecular weights from the periodic table to convert grams to NaOH to moles of NaOH
2) A balanced stoichiometric equation can be considered a ratio of moles for that reaction. So going by the coefficients, you know 2 moles of NaOH will yield 1 mol of Sodium Sulfate.
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LET'S GO BUCKS
#6
A compound contains 18.8% sodium, 29.0% chlorine, and 52.2% oxygen, by mass. If the
molar mass of the compound is 122.44 g/mol, determine the empirical and molecular
formulas
#7
You are that guy who had sex what that underage girl right? I think the chemistry test is the least of your issues.

Also are you gay? I see no other way how guys at a gym can infect you
Quote by Carmel
I can't believe you are whoring yourself out like that.

ಠ_ಠ
#8
MW Na = 22.99 g/mol
MW Cl = 35.45 g/mol
MW O = 15.99 g/mol

First determine the molecular formula knowing the total molecular weight and the mass compositions.

122.44*0.188 = 23.02 g/mol. 23.02/22.99 ~ 1, so there is 1 sodium atom.
122.44*0.290 = 35.50 g/mol. 35.51/35.45 ~ 1, so there is 1 chlorine atom.
122.44*0.522 = 63.91 g/mol. 63.91/15.99 ~ 4, so there are 4 oxygen atoms.

So your molecular formula is NaClO4. Since this is the lowest whole number ratio, it is also the empirical formula.
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LET'S GO BUCKS
#9
Quote by Neo Evil11
You are that guy who had sex what that underage girl right? I think the chemistry test is the least of your issues.

Also are you gay? I see no other way how guys at a gym can infect you

Had sex with an underage girl 4 years ago (i was 16), the college gym here doesnt have disinfectant wipes and i noticed nobody washes their damn hands
#10
Quote by AeroRocker
MW Na = 22.99 g/mol
MW Cl = 35.45 g/mol
MW O = 15.99 g/mol

First determine the molecular formula knowing the total molecular weight and the mass compositions.

122.44*0.188 = 23.02 g/mol. 23.02/22.99 ~ 1, so there is 1 sodium atom.
122.44*0.290 = 35.50 g/mol. 35.51/35.45 ~ 1, so there is 1 chlorine atom.
122.44*0.522 = 63.91 g/mol. 63.91/15.99 ~ 4, so there are 4 oxygen atoms.

So your molecular formula is NaClO4. Since this is the lowest whole number ratio, it is also the empirical formula.

Thanks man