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anonymous
 5 years ago
How many atoms of 12C are in a 3.50 g sample of this particular isotope?
anonymous
 5 years ago
How many atoms of 12C are in a 3.50 g sample of this particular isotope?

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.012C: 12g 1mol actual: 3.5g xmol x=3.5/12=something (mol) number of atom = something*Avogadro number

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Well there are many ways of doing this, x=3.5/12= unknown thats stands for (mol) but really 3.5g is xmol number of it=unknown. Do you get it?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Kind of. So for 3.5/12= 482.4?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0These are the options I have 2.11 x 1024 atoms 2.07 x 1024 atoms 8.01 x 1023 atoms 1.52 x 1023 atoms 1.76 x 1023 atoms

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Would it be the first one?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Yes that is close enough

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0This is the answer 1.76 x 1023 atoms.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the last one is right. You calculate x then take the result times avogadro constant

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Can you guys help me out with this one? A sample of (N2H5)2C3H4O4 contains 1.084 ×1024 carbon atoms. How many moles of hydrogen atoms are in the same sample?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0this is dead easy. can you count how many H and how many C in the formula?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0good, now do some rough work H C 14 3 x atoms 1.084 *10^24 atoms so you can find x=1.084*10^24*14/3=blabla number of mol of H = blabla/Avogadro constant

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0That's what I got but it's not in the choices I have. These are the choices! 34.7 g 1.56 × 1021 g 937 g 6.43 × 1020 g 31.2 g

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0those choices are in g, not in mol, I doubt that's not the right choices for this qs

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I think they are because it's online through a school program.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Do I have to convert it to mol to grams now?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Never mind, sorry. I mixed up a question. This is the right answer.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0lol so it's correct yeah? my brain is not really getting old lol

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Do you mind helping me with more?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0The mass of 5.20 mol of glucose, C6H12O6 is? A34.7 g B1.56 × 1021 g C937 g D6.43 × 1020 g E31.2 g

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0It's 482.4g. But it doesn't make sense.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you need to find the mass formula for glucose first. 6mols of C, 12mols H, 6mols O MC=12 MH=1 MO=16 so 6*12+12*1+6*16=180(g/mol) there are 5.2 mols so mass m=180*5.2=936g

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Oh... ok got it. I'm making harder than it is :P

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0you know it's good to remember the mass of 1 mol of some common substance. I've done these in secondary school and I still remember them now. I'd say that's big advantage. e.g H=1, O=16, N=14, Cl=35.5, C=12... those commonly used you should remember. Save you lots of time in exam.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0I actually do remember these basic ones. Thanks for the tip. If you have any other tips, shoot'em.

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0lol I wasn't that great at chemistry though. remember this too K  Na  Ca  Mg Al  Zn  Fe Ni  Sn  Pb  H  Cu  Hg  Ag Pt  Au That's extremely helpful when you deal with acid and base And always try to make a table of information first, make the problem clearer. And don't get scared of those Chem teachers. When they die, they'll just turn into HCON, no more no less =))

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0good luck. I'm off to bed.
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