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 Propane is C3H8 

The balanced equation is: 
C3H8 + 5 O2 --> 3 CO2 + 4 H2O 
From the balanced equation you can see that for each mole of C3H8 you obtain 4 moles of H2O. 

moles H2O = 5.0 moles C3H8(4 moles H2O/1 mole C3H8) = 20 moles H2O formed 

Use Avogadro's number to find the number of molecules. 
molecules H2O = 20 moles H2O(6.02 x 10^23 molecules/1 mole) = 1.20 x 10^25 H2O molecules

1.20 ×10²⁵ Molecules of H₂O are formed if 5.0 moles of C3H8 react.

What is a balanced chemical equation?

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.

The balanced chemical equation for combustion of propane is as follows:

C₃H₈  +  5 O₂    →    3 CO₂  +  4 H₂O

According to equation,

1 mole of C₃H₈ on combustion gives  =  4 moles of H₂O

So, 5 moles of C₃H₈ on combustion will give  =  X moles of H₂O

Solving for X,

X  =  (5 mol × 4 mol) ÷ 1 mole

X  =  20 moles of H₂O

Calculating number of molecules for 20 moles of H₂O,

As,

1 mole of H₂O contains  =  6.022 × 10²³ molecules

So,

20 moles of H₂O will contain  =  X molecules

Solving for X,

X  =  (20 mole × 6.022 × 10²³ molecules) ÷ 1 mol

X  =  1.20 ×10²⁵ Molecules of H₂O

Hence, 1.20 ×10²⁵ Molecules of H₂O are formed if 5.0 moles of C3H8 react.

Learn more about balanced chemical equation here:

https://brainly.com/question/15052184

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