Question

how many moles of o2 would be required to produce 4 mol h2o?

Answer 1

Hii there !

The reaction accompanying production of water in this case would be -

$\green{ \underline { \boxed{ \sf{2H_2+O_2\longrightarrow 2H_2O}}}}$

Thus ,by observing the reaction, we can conclude that 2 mole of Hydrogen $(H_2 )$react with 1 mole of oxygen$(O_2)$to produce 2 mole of water $(H_2O)$

Now,

To produce 1 moles of water.

Moles of Oxygen$(O_2)$ required $= \frac{1}{2}$ moles

Similarly,

To produce 4 moles of water.

$\implies$ Moles of Oxygen$(O_2)$ required = $\frac{1}{2}\times 4$ moles

$\implies$ 2 moles

Hope it helps.