Question

In the reaction of H2 + O2 ---> 2H2O, if 7.28 moles of O2 is used, how many moles of H2O will be generated?

Answer 1

Hello @Mateaus !

Answer 2

Hello

Answer 3

I don't remember how to start off this problem.

Answer 4

According to the given reaction one mole of O\(_2\) will react with one mole of H\(_2\) to form 2 moles of H\(_2\)O.

Answer 5

Now 7.28 moles of O\(_2\) will form 7.28*2=14.56 moles of H\(_2\)O

Answer 6

Getting my points ?

Answer 7

In the reaction of 2H2 + O2 ---> 2H2O, if 7.28 moles of O2 is used, how many moles of H2O will be generated? I forgot to add a 2 in front of H2

Answer 8

Would it still work the same way?

Answer 9

yes, but it will change if hydrogen is given and H2O is to be determined.

Answer 10

getting ?

Answer 11

How come the hydrogen doesn't affect with the 7.28moles of the oxygen?

Answer 12

Because we are assuming that the hydrogen is already present in the required amount

Answer 13

Even though there is 2 moles of hydrogen?

Answer 14

We r just calculating the oxygen's part !

Answer 15

yes, in the new equation u gave 2 moles of hydrogen is reacting with one mole of oxygen to produce 2 moles of water

Answer 16

so if i ask, how much water will be produced if one mole of oxygen is used. Then u'll say 2 moles. If i ask how many moles of water will be produced if i use one mole of hydrogen, then u'll say one mole.

Answer 17

getting it ?

Answer 18

I am still thinking on the second one

Answer 19

guys.....again it was supposed to be an easy question,...

Answer 20

For 2H2 + O2 ---> 2H2O
2H2 ------> 2H2O
1O2------> 2H20

Answer 21

Yes, but if I have just 1 mole of hydrogen, then on the product side oxygen wouldn't be balanced

Answer 22

yes, but the question has given no info about hydrogen.

Answer 23

so we will consider that hydrogen is present in sufficient amount

Answer 24

I mean hydrogen will be balanced if they both are 1 mole but wouldn't that affect the oxygen since on the reactan side there is 2 of oxygen while on the product side they will be just 1

Answer 25

or I simply ignore that and look to both hydrogens?

Answer 26

in the product side one mole of water is produced...it contains two moles of hydrogen

Answer 27

so reactant and product side gets balanced this way

Answer 28

H2 + O2 ---> 2H2O


ratio between O2 and H2 is 1:1
that is why mole of O2 = mole of H2

now we see the ratio between O2 and H2O or H2 and H2O (doesn't matter since mole is same for both H2 and O2)

so ratio is 1:2
means ratio 1 is ---7.28 (because O2 is 1 and H2O is 2)
ratio 2 is ---- X

X= 2* 7.28 /1 = 14.56 moles of H2O

Answer 29

i just noticed @Mateaus
the reaction is not balanced!!!

Answer 30

It will be 2H2 + O2----> 2H2O

Answer 31

balance it and do the rest in the same way basically

Answer 32

is it clear @Mateaus ?

Answer 33

"If i ask how many moles of water will be produced if I use one mole of hydrogen, then u'll say one mole." I am trying to understand this one yet.

Answer 34

if I balanced it then it will go back to 2H2 + O2 --> 2H2O though

Answer 35

btw lol the answer will still be same

Answer 36

@Mateaus what is the answer that u have?

Answer 37

14.56 but I am trying to understand this part lol

Answer 38

because 2 moles of hydrogen produce two moles of water, so one mole of hydrogen will react with half mole of oxygen to form one mole of water.

Answer 39

alright did u understand what i did?
do u know how to work with ratio?

Answer 40

if I have 1H +O2 --> 1H2O then O in the produc side won't be balanced.

Answer 41

1H + 1/2 O2----> 1H2O

Answer 42

@Abhisar its H2 + 1/2 O2----> 1H2O

Answer 43

\(\color{blue}{\text{Originally Posted by}}\) @Abhisar
1H2 + 1/2 O2----> 1H2O
\(\color{blue}{\text{End of Quote}}\)

Answer 44

we are talking in moles...are u getting it now ?

Answer 45

oh I remember balancing it by diving both sides by 2 in order to make them balanced.

Answer 46

yes...

Answer 47

ah ok all is clear now haha. Thanks you two :D

Answer 48

for questions like these u just need to find out that how much of the interested reactant produces how much product. Then u can calculate the answer using unitary method. like in this 2 mole of hydrogen produces 2 mole of water, so 1 mole of hydrogen will produce 1 mole of water and so on.

Answer 49

so if I had 2O2(just as example) and the question says if 7.28moles of O2 is used. I would first multiply the 7.28moles to the 2 of the O2 and then the result of that multiply by the moles of water in the product side to obtain the moles of H2O generated.

Answer 50

2 is coefficient.... its not mole @Mateaus

Answer 51

is not the number of coefficient, the number of moles of something?

Answer 52

h