- #1
sinandcity
- 5
- 0
Hi everyone
I've just got a few questions regarding some Chemistry stuff I've been doing out of my textbook (Year 11 Chemistry). We've been learning this in class, I thought I understood it, but I must be blacking out a little bit.
5) Calculate the mass of one atom of:
a) Zinc
Zn
65.4 AMU.
In one mole of Zn there is 65.4g/ mol.
How do I go from here? I thought it would've been something like 1 x 6.02x 10 (23), but that would show the amount of atoms in total, and if I'm trying to find the mass of one atom, how do I go about it? do I divide by the atomic weight? am I doing something wrong?
Also, the molar mass and molecular weight, is that just the same as the mass of one mole of [whatever]?
and...
10) What is the mass of:
c) 6.24 x 10-2 mol hydrogen gas?
H x 1 + 0 x 2
1 + 32
= 33 AMU.
So in one mole of H02 there is 33g/ mol.
6.24 x 10-2
-------------
33
Am I on the right path?Is Molecules the same thing as Atoms? I often get confused with moles and molecules, but understand they are 2 different things.
11) How many molecules are there in 7.0g of nitrogen gas, N2? How many nitrogen atoms are there in this sample?
N x 2
14 x 2
= 28 AMU
Therefore one mole of N2 has a mass of 28g/ mol.
7
--
28
= 0.25 mol.
0.25 x 6.02 x 10 (23)
Please point out if I'm doing anything incorrectly.
I don't expect answers for the questions, as they aren't really homework questions, but I'd really like to know how to do them, as it's holidays and I haven't got a teacher handy. I've given all the questions a go, to the best of my ability and knowledge.
Thanks so much.
I've just got a few questions regarding some Chemistry stuff I've been doing out of my textbook (Year 11 Chemistry). We've been learning this in class, I thought I understood it, but I must be blacking out a little bit.
5) Calculate the mass of one atom of:
a) Zinc
Zn
65.4 AMU.
In one mole of Zn there is 65.4g/ mol.
How do I go from here? I thought it would've been something like 1 x 6.02x 10 (23), but that would show the amount of atoms in total, and if I'm trying to find the mass of one atom, how do I go about it? do I divide by the atomic weight? am I doing something wrong?
Also, the molar mass and molecular weight, is that just the same as the mass of one mole of [whatever]?
and...
10) What is the mass of:
c) 6.24 x 10-2 mol hydrogen gas?
H x 1 + 0 x 2
1 + 32
= 33 AMU.
So in one mole of H02 there is 33g/ mol.
6.24 x 10-2
-------------
33
Am I on the right path?Is Molecules the same thing as Atoms? I often get confused with moles and molecules, but understand they are 2 different things.
11) How many molecules are there in 7.0g of nitrogen gas, N2? How many nitrogen atoms are there in this sample?
N x 2
14 x 2
= 28 AMU
Therefore one mole of N2 has a mass of 28g/ mol.
7
--
28
= 0.25 mol.
0.25 x 6.02 x 10 (23)
Please point out if I'm doing anything incorrectly.
I don't expect answers for the questions, as they aren't really homework questions, but I'd really like to know how to do them, as it's holidays and I haven't got a teacher handy. I've given all the questions a go, to the best of my ability and knowledge.
Thanks so much.
Last edited: