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Avogadro constant help please

How many protons are there in 6.0g of nitrogen gas?
Avogadro constant = 6.022 x 10^23 mol-1

Answer is 1.8 x 10^24
How do I get to this?

Reply 1

Pigster

Original post by anactualmess

How many protons are there in 6.0g of nitrogen gas?
Avogadro constant = 6.022 x 10^23 mol-1

Answer is 1.8 x 10^24
How do I get to this?

How many protons are there per molecule of N2?

Reply 2

anactualmess

14?

Original post by Pigster

How many protons are there per molecule of N2?

Reply 3

sotor

Original post by anactualmess

14?

how many molecules of gas in 6g?

Reply 4

anactualmess

well there's 6.022 x 10^23 molecules of gas in 28g
28/6 = 4.7
so assuming you divide 6.022 x 10^23 by 4.7 to get the number of molecules of gas in 6g? So 1.3 x 10^23?

Original post by sotor

how many molecules of gas in 6g?

Reply 5

sotor

Original post by anactualmess

well there's 6.022 x 10^23 molecules of gas in 28g
28/6 = 4.7
so assuming you divide 6.022 x 10^23 by 4.7 to get the number of molecules of gas in 6g? So 1.3 x 10^23?

yep! be careful of rounding errors, you should have 1.29*10^23.
I did (6/28)*(6.02*10^23) but if your way makes sense to you then stick with that

so how many protons in 1.3*10^23?

Reply 6

anactualmess

only thing I can think of is 1.29 x 10^23 x 14? But I don't really understand why that is

Original post by sotor

yep! be careful of rounding errors, you should have 1.29*10^23.
I did (6/28)*(6.02*10^23) but if your way makes sense to you then stick with that

so how many protons in 1.3*10^23?

Reply 7

sotor

Original post by anactualmess

only thing I can think of is 1.29 x 10^23 x 14? But I don't really understand why that is

yep! if you have 14 protons in every molecule, then in 100 molecules you have 100x14 protons

and if you have 1.29*10^23 molecules, you get your answer

does that make sense?

Reply 8

anactualmess

ah okay thank you!

Original post by sotor

yep! if you have 14 protons in every molecule, then in 100 molecules you have 100x14 protons

and if you have 1.29*10^23 molecules, you get your answer

does that make sense?

Reply 9

logic111

first find the number of moles Mr(N2) = 14X2 = 28mass = 6.0gn(mol)= mass/Mr = 6/28 =Ans number of 1 proton = 6.022x10^23 x Ans = Ans2Nitrogen(N) has 7 protons where as N2 would have x2 = 14total protons in N2 gas 14 x Ans 2

Reply 10

ZzZzZz121212

1.) Work out moles of Nitrogen : 6g/14 = 0.42892.) Workout the number of particles by multiplying the moles by Avogadro's constant : 0.04289 x 6.022x10^23 = 2.58 x10^23.3.) Because there are 7 protons in each particle of N, multiply your anwser by 7 which give syou 1.8 x10^24.

Reply 11

Sparky123789

Original post by ZzZzZz121212

Wouldn’t you multiply by 14 because it’s N2 so (7+7) = 14 protons

Reply 12

iamdopamine

Original post by Jaafar123

Wouldn’t you multiply by 14 because it’s N2 so (7+7) = 14 protons

they worked out the moles of one atom of nitrogen so they did the protons per atom. I suggest doing it the other guy's way where you take into account it's diatomic and that you multiply it by 14 in the end

Reply 13

boss321

Original post by sotor

yep! if you have 14 protons in every molecule, then in 100 molecules you have 100x14 protons

and if you have 1.29*10^23 molecules, you get your answer

does that make sense?

Wrong!