Question

In 3 moles of ethane calculate the following.
(a) no of moles of C atom.
(b) no of moles of H atom.
(c) no. of molecules of ethane.

Answer 1

@waterineyes

Answer 2

Answer
(i) 1 mole of C2H6 contains 2 moles of carbon atoms.
Number of moles of carbon atoms in 3 moles of C2H6 = 2 × 3 = 6


(ii) 1 mole of C2H6 contains 6 moles of hydrogen atoms.
Number of moles of carbon atoms in 3 moles of C2H6 = 3 × 6 = 18

(iii) 1 mole of C2H6 contains 6.023 × 10^23 molecules of ethane.
Number of molecules in 3 moles of C2H6 = 3 × 6.023 × 10^23 = 18.069 × 10^23

Answer 3

what about atoms ?

Answer 4

have you copy pasted it @hanah ?

Answer 5

u have to find mole not atom

Answer 6

i know that .. i want for atoms too !

Answer 7

ok

Answer 8

can you explain this ?

Answer 9

http://freeonlinehelpns.blogspot.in/2012/06/in-three-moles-of-ethane-c2h6-calculate.html

Answer 10

i had already checked the link .. only then did i come to open study

Answer 11

i didn't understand that .. so can you explain ?

Answer 12

its just as simple just multiply 3 as given in your question with the number of mole present in the formula of ethane

Answer 13

She is right..

But it seems you are not satisfied or you did not get that ??

Right??

Answer 14

yeah !

Answer 15

See I give you another example so that you get some understanding:

See; Let suppose we have Water (already you have too)

\(H_2O\)

Now tell me how many H and O are there ??

Answer 16

does that mean whenever the qn is find the moles i should multiply the given atoms with the number of moles present ? EVERY TIME ?

Answer 17

Wait go slow...

I explain you everything..

Just tell me what I asked..

Answer 18

2 H and 1 O

Answer 19

If you look Atom wise:

Then there are two atoms of H and one atom of O

Right ??

Answer 20

yeah !

Answer 21

So:

For two H. there are 2 mole of H atom

For one H there are 1 mole of H atom

This is according to the atoms present in \(H_2O\)..

Getting ??

Answer 22

yes

Answer 23

*is

Answer 24

Okay now moving forward:
This is for single \(H_2O\)


What if I said : for \(2 H_2O\)

Answer 25

4 H and 2 O ?

Answer 26

Yes..

So 4 moles of H and 2 moles of O..

Answer 27

yeah !

Answer 28

Similarly in your question:

you can just understand your question as : \(3(C_2H_4)\)

How many C and H are there ??

Answer 29

H_6...

Answer 30

6 C and 12 H

Answer 31

Sorry for \(C_2H_6\)..

Answer 32

okay 18 H

Answer 33

How ??

Answer 34

Yes now you are right.

Answer 35

is it just C2H6 OR 3(C2H6)

Answer 36

Ethane is just : \(C_2H_6\)

Answer 37

But you are given 3 moles of it : 3 Moles of \(C_2H_6\)

Answer 38

So you can write it as : \(C_2H_6 + C_2H_6 + C_2H_6 = 3 C_2H_6\)

Answer 39

oh okay .. understood .. so any qn like this ..i shud follow the same steps right ?

Answer 40

@hanah and @waterineyes thanks :)

Answer 41

Yes..

For calculating atoms in the molecule we follow the same steps..

Answer 42

okay !

Answer 43

Understood ??

c part you can do or not ??

Answer 44

yes that i know :)

Answer 45

can you see that in nana3456 you are still typing something ?

Answer 46

or is it just my comp wch makes me see like that ?

Answer 47

I am wondering by seeing that..

Answer 48

See this site stopped working for me when I was typing that reply..

Ha ha ha.

Answer 49

:P .. from the morning you are typing something and i were wondering why you wern't entering it :P

Answer 50

At that time I was replying to Nana and this site did not work properly for me then..

Sorry I could not reply to you..

Answer 51

its okay :)