wolfgirl
In the equation ___CH4 + ___O2 ___CO2 + ___H2O, what number will go in front of the H2O to balance the equation?
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online334
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idk that is hard lol
JamesJ
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I guess what you mean is
___CH4 + ___O2 --> ___CO2 + ___H2O
is that right?
wolfgirl
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yes
online334
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yeah i was going tay what james said
online334
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lol
online334
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hi james it is snowball
online334
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i got banned made another acount thoe
JamesJ
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well the number of atoms of each element has to balance on both sides. So if we start with one CH4 atom, we must have one CO2 atom:
1 CH4 + ___O2 --> 1 CO2 + ___H2O
Now, what can you say about the other two atoms?
(Hi online/snowball)
online334
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hi james
wolfgirl
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that there are a 2 of them
online334
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yeah
JamesJ
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Did you see why with one CH4 molecule there must be one CO2 molecule?
That is because with one CH4 molecule, there is only one carbon atom on the left-hand side. So there must only be one carbon atom on the right-hand side.
wolfgirl
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ok. I understand
online334
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good
JamesJ
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So right now we have that
1 CH4 + ___O2 --> 1 CO2 + ___H2O
Now, given that, how many hydrogen atoms must there be on the RHS (right hand side)?
wolfgirl
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4?
JamesJ
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Yes. And hence how many water molecules H2O must there be?
wolfgirl
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4
JamesJ
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No. Each water molecule has two hydrogen atoms, that's why we write H2O and not HO
wolfgirl
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so it's 2?
online334
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yes
JamesJ
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Yes. Hence we now have that
1 CH4 + ___O2 --> 1 CO2 + 2 H2O
Now, count up the oxygen atoms on the RHS and figure out how many O2 molecules we need on the LHS.
wolfgirl
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2
online334
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omh lhs iw my highschool i use to go to
JamesJ
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right. So the final answer is
1 CH4 + 2 O2 --> 1 CO2 + 2 H2O
wolfgirl
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ok thank you
online334
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no problem
JamesJ
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You can see that there are some more questions like this here; scroll down a bit. You might find it useful to have a look at them.
wolfgirl
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ok. I will