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    For the avagadro constant question did you have to divide the number of atoms by 5 because they were asking for the number of molecules? (And there were 5 atoms per molecule)
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    (Original post by MathsNerd1)
    Which question was this for


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    Second question on the paper. Asking about Protons neutrons and electrons
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    (Original post by trrr)
    PH3- vdw forces

    NH3- Hydrogen bonds
    Ok i need help
    in the box in the question for the bonding of PH3 AND NH3
    which one was at the top- because i just remember writing h-bond for the top one and VDW for the bottom one??
    :titan:
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    (Original post by Meee.)
    For the avagadro constant question did you have to divide the number of atoms by 5 because they were asking for the number of molecules? (And there were 5 atoms per molecule)
    I didn't divide by 5. But maybe you had to. Did you divide by 5?
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    (Original post by yodawg321)
    Second question on the paper. Asking about Protons neutrons and electrons
    Well is it was an isotope the electrons and protons stay the same and only the neutrons change, so yeah it was that, I forgot about that answer


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    (Original post by Ferrari_1996)
    I didn't divide by 5. But maybe you had to. Did you divide by 5?
    I didn't divide by 5 :/
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    (Original post by Meee.)
    For the avagadro constant question did you have to divide the number of atoms by 5 because they were asking for the number of molecules? (And there were 5 atoms per molecule)
    Why divide by 5? It wasn't needed if I've remembered correctly.


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    i didnt notice that:unimpressed:
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    (Original post by Ferrari_1996)
    I didn't divide by 5. But maybe you had to. Did you divide by 5?
    Yeh because the avagadro constant gives you the number of atoms, not number of molecules. Plus it was 3 marks! Otherwise it would've been a 2 marker?
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    Did anyone get 3.01 x 10^22 for the avongardo constant q?
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    what the 5 marker just about reactivity increasing down group 2?
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    (Original post by Meee.)
    For the avagadro constant question did you have to divide the number of atoms by 5 because they were asking for the number of molecules? (And there were 5 atoms per molecule)
    I did that but I've checked online and we were meant to do the 0.05 moles times by avogadro's constant. We'll probably get 2 out of 3 marks though.

    http://www.ehow.com/how_8463162_numb...ven-grams.html
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    (Original post by abudabu)
    Did anyone get 3.01 x 10^22 for the avongardo constant q?
    yep
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    (Original post by Meee.)
    Yeh because the avagadro constant gives you the number of atoms, not number of molecules. Plus it was 3 marks! Otherwise it would've been a 2 marker?
    Oh. I forgot that, I'm feeling like I've only got about 52-54 now :-/


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    (Original post by abudabu)
    Did anyone get 3.01 x 10^22 for the avongardo constant q?
    What question was that?
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    (Original post by abudabu)
    Did anyone get 3.01 x 10^22 for the avongardo constant q?
    Same here!


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    (Original post by Meee.)
    For the avagadro constant question did you have to divide the number of atoms by 5 because they were asking for the number of molecules? (And there were 5 atoms per molecule)
    I thought that didn't matter. I thought 1 mol was 6.02X10^23 for any particles. So like 1 mole of a grain of sand= 6.02X10^23 sand compound. So wouldn't 1 mol of a molecule just be 6.02X10^23 molecules?
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    (Original post by k1rby)
    I did that but I've checked online and we were meant to do the 0.05 moles times by avogadro's constant. We'll probably get 2 out of 3 marks though.

    http://www.ehow.com/how_8463162_numb...ven-grams.html
    I divided by 5 too It makes more sense, sneaky question!
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    (Original post by anonymousecheese)
    Ok i need help
    in the box in the question for the bonding of PH3 AND NH3
    which one was at the top- because i just remember writing h-bond for the top one and VDW for the bottom one??
    :titan:
    yeah that's fine...nh3 was at the top
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    (Original post by MathsNerd1)
    Same here!


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    here too :awesome:
 
 
 
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