In 2H2+O2--->2H2O, what is the number of molecules of oxygen needed to form 0.8mol of water?



Answer:
One mole of O2 is needed to create 2 moles of H2O,
so it only take 0.4 moles of O2 to make 0.8mol of water.
If you have 0.8 moles of water then
you have 0.4 moles of oxygen according
to the mole to mole ratio. Now dont forget
that a mole is 6.022x1023 molecules.
Therfore you will end up with 2.4E23 molecules
of oxygen

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