Given 5 moles of O2 How many moles of H2O

Moles of H2O = 10 moles

Given

5 moles O2

Required

Moles of H2O

Solution

The empirical formula is the smallest comparison of atoms of compound forming elements.  

A molecular formula is a formula that shows the number of atomic elements that make up a compound.  

Reaction make water

2H2 + O2 → 2H2O

From the equation, mol ratio O2 : 2H2O = 1 : 2 so moles H2O :

= 2/1 x moles O2

= 2/1 x 5 moles

= 10 moles

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