Can someone help me out and explain this chemistry problem please? Im lost.?

Question

Acetylene gas, C2H2, reacts with oxygen according to the following equation. If two moles of acetylene react completely with sufficient oxygen, how many grams of water are produced?



2C2H2 + 5O2 -------> 4CO2 + 2 H2O

Answer 1

Let me try.
First, you almost always need to have the reaction equation balenced. Always check the equation given. In this case, the given equation is balenced already.
Second, most of the time you need to convert mass to mole for every chemical concerned. You should accustomed to think in terms of mole: A mole is a certain number of molecules--this makes balenced reaction equation very useful.
Third, you always need to either memorize or check the atomic mass and thus figure out the molecular (or formula) mass.
Now, let us come to this specific problem.
1. The equation is balenced.
2. Nothing needs to be converted from grams to moles.
3. given 2 moles of C2H2, according to the equation, would produce 2 moles of H2O.
4. Hence the molecular mas of H2O is needed: 18g/Mol
5. Back convert moles to grams: 2(mol)x18(g/mol) = 36(g)
that is the answer!

Answer 2

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