The Avogadro constant is 6.0 x 1023 mol–1.
The number of atoms in1 mol of dinitrogen tetroxide, N2O4, is
A 3.6 × 1024
B 1.8 × 1024
C 6.0 × 1023
D 1.0 × 1023Spoiler:ShowI got A, but the answer is D? help please!
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alevels2k15
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TheonlyMrsHolmes
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(Original post by alevels2k15)
The Avogadro constant is 6.0 x 1023 mol–1.
The number of atoms in1 mol of dinitrogen tetroxide, N2O4, is
A 3.6 × 1024
B 1.8 × 1024
C 6.0 × 1023
D 1.0 × 1023Spoiler:ShowI got A, but the answer is D? help please! -
Shadowfire123
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- 22-05-2015 05:22
(Original post by alevels2k15)
The Avogadro constant is 6.0 x 1023 mol–1.
The number of atoms in1 mol of dinitrogen tetroxide, N2O4, is
A 3.6 × 1024
B 1.8 × 1024
C 6.0 × 1023
D 1.0 × 1023Spoiler:ShowI got A, but the answer is D? help please!
(Original post by TheonlyMrsHolmes)
How did you get you answer, this has stumped me! Wonderful feeling since there are only a few hours to go until the exam!
Yes, there are 6.0 × 10^23 particles in any 1 mole. In this case the particles are molecules of N2O4, but the question didn't ask for the number of molecules of N2O4. It wants to know the number of atoms. In each molecule of N2O4 there are two atoms of N and four atoms of O, for a total of six atoms per molecule, so: (1 mol N2O4) x (6.0 × 10^23 molecules/mol) x (6 atoms/molecule) = 3.6 x 10^24 atoms total.Last edited by Shadowfire123; 22-05-2015 at 05:58. -
FluffyCherry
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- 22-05-2015 05:32
how do you find the maximum volume of a gas???
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FluffyCherry
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- 22-05-2015 05:41
(Original post by alevels2k15)
The Avogadro constant is 6.0 x 1023 mol–1.
The number of atoms in1 mol of dinitrogen tetroxide, N2O4, is
A 3.6 × 1024
B 1.8 × 1024
C 6.0 × 1023
D 1.0 × 1023Spoiler:ShowI got A, but the answer is D? help please! -
FluffyCherry
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- 22-05-2015 05:47
In the mark scheme, why is there 2 different ways of calculating percentage error? eg. if it's
u'll have to multiple by
I guess? then divide by
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Shadowfire123
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- 22-05-2015 05:57
(Original post by FluffyCherry)
In the mark scheme, why is there 2 different ways of calculating percentage error? eg. if it'su'll have to multiple by
I guess? then divide by
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Shadowfire123
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- 22-05-2015 05:58
(Original post by FluffyCherry)
Are you sure it's not A? Cus I've also got A.. 6 atoms and cos it's 1 mol, the avogadro constant should stay the same, so -
Shadowfire123
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- 22-05-2015 06:00
(Original post by FluffyCherry)
In the mark scheme, why is there 2 different ways of calculating percentage error? eg. if it'su'll have to multiple by
I guess? then divide by
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FluffyCherry
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- 22-05-2015 06:08
(Original post by Shadowfire123)
can tell me the question because I always get those question wrong -
FluffyCherry
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- 22-05-2015 06:08
When 0.1 mol of atoms of an element reacts with chlorine,?there is an increase in mass of 7.1 g. please explain the element could be: carbon sodium magnesium aluminium
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Shadowfire123
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- 22-05-2015 06:11
(Original post by FluffyCherry)
It's in the edexcel MAY 2013 paper, question 21 (c) -
Shadowfire123
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- 22-05-2015 06:13
(Original post by FluffyCherry)
When 0.1 mol of atoms of an element reacts with chlorine,?there is an increase in mass of 7.1 g. please explain the element could be: carbon sodium magnesium aluminium
you do 7.1 over 35.5 which gives you 0.2 mol this mean that its 1 -2 ratio between the element and chlorine now find which one it isSpoiler:Showso this mean ITS magnesium is the answer CLast edited by Shadowfire123; 22-05-2015 at 06:16. -
Dinaa
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- 22-05-2015 06:20
(Original post by Shadowfire123)
you do 7.1 over 35.5 which gives you 0.2 mol this mean that its 1 -2 ratio between the element and chlorine now find which one it isSpoiler:Showso this mean ITS magnesium is the answer C
Hey could you explain to me cis trana isomerism. idk how to look at it. The bottom and top or the left hand side to right hand side -
Dinaa
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- 22-05-2015 06:22
.
I said bring the tube lower and have the tube go directly into the tube.. idk and another point? -
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- 22-05-2015 06:24
(Original post by Shadowfire123)
how would you work it out
you times 100 because in the question it says plus or minus 0.5.
Then divide by 11, cus of the temperature rise, which is also mentioned in the question. -
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- 22-05-2015 06:27
(Original post by Dinaa)
.
I said bring the tube lower and have the tube go directly into the tube.. idk and another point? -
FluffyCherry
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- 22-05-2015 06:29
Could anyone list the calculations for unit 1 (edexcel)
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Shadowfire123
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- 22-05-2015 06:29
(Original post by Dinaa)
Hey could you explain to me cis trana isomerism. idk how to look at it. The bottom and top or the left hand side to right hand side
and trans is when they are different side -
Shadowfire123
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- 22-05-2015 06:30
(Original post by FluffyCherry)
0.5 x 2 x 100.
you times 100 because in the question it says plus or minus 0.5.
Then divide by 11, cus of the temperature rise, which is also mentioned in the question.
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