Question

Number of moles of oxygen neededto produce 4 moles of water on reacting with 4 moles of hydrogen gas............... ?​

Answer 1

Answer:

2 molecules

Explanation:

4H₂ + XO₂ yields 4H₂O

Elements in LHS:-

8 atoms of  Hydrogen

2X atoms of Oxygen

Elements in RHS:-

8 atoms of  Hydrogen

4 atoms of Oxygen

Since LHS=RHS,

2X=4

X=2

∴ 2 molecules of oxygen can react with four molecules of hydrogen to form 4 molecules of water.