Question

Assuming all volume measurements are made at the same temperature and pressure, how many liters of water vapor can be produced when 8.23 liters of oxygen gas react with excess hydrogen gas? Show all of the steps taken to solve this problem.


Balanced equation: 2 H2 (g) + O2 (g) 2 H2 O(g)

Answer 1

@chmvijay would help you :3 I'm sure

Answer 2

please helo @chmvijay

Answer 3

@chmvijay please!

Answer 4

@ganeshie8 can you please help me

Answer 5

@thomaster

Answer 6

\(\large\sf 2H_2 (g) + O_2 (g) \to 2 H_2 O(g)\)

you have 8.23 liters of \(\large\sf O_2\)
Do you know how to convert that to moles?

Answer 7

no i do not

Answer 8

Okay look at this diagram

Answer 9

You have the volume, you need moles
For gasses, 22.4 L equals 1 mole
So you have to divide your volume by 22.4 to get the amount of moles O2

Answer 10

okay i see

Answer 11

Do you know what the reaction ratio is for this reaction?

Answer 12

no i do not

Answer 13

2 moles of \(\sf H_2\) reacts with 1 mole of \(\sf O_2\) to produce 2 moles of \(\sf H_2O\)
So the ratio is 2:1:2

Answer 14

alrighty whats afTer that

Answer 15

Now you know that you need 1 mole of O2 to produce 2 mol H2O
so when you calculate the amount of moles O2 you have, you just multiply that with 2, and you'll have the amount of moles H2O that is produced

Answer 16

alright after that??

Answer 17

So do you know the amount of moles O2 you have?

Answer 18

no i do not lol

Answer 19

Like i told before, to get the amount of moles of a gas, divide the volume by 22.4

So for you its: \(\large\dfrac{8.23}{22.4}\)

Answer 20

so you have to divide to get the amount of moles in O2?

Answer 21

Yes :)

Answer 22

so that's 2.72

Answer 23

No you have to divide 8.23 by 22.4 :P not vice versa

Answer 24

ohhhhh so it's 0.36

Answer 25

yea 0.3674 to be more precise.

So do you remember what to do now? think of the ratio

Answer 26

multiply by 2

Answer 27

exactly :)

Answer 28

so its 0.7348

Answer 29

Yes and now you have to go from mole to volume
So not divide by 22.4 but multiply by 22.4 :)

Answer 30

so i multipy 0.7348 by 22.4?

Answer 31

Yes

Answer 32

i got 16.45952

Answer 33

Yes that's correct

Now what is 8.23 multiplied by 2?

Answer 34

16.46

Answer 35

so that's the answer? :)

Answer 36

Yea :) do you understand this mole ratio now?
A shortcut is to just multiply the liter gas it by 2 :P
but that only works for gasses

Answer 37

yes i understand now! thank you so much :)

Answer 38

great job!

Answer 39

save the mole conversion diagram, it can be very helpful in chemistry

Answer 40

sorry i was offline :)