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Five molecules of propane have 40 hydrogen atoms.

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How many atoms are present in the formula for propane?

The chemical formula of propane is C3H8; 11 atoms are present in the molecule.


How many propane molecules are in 22.4 liters of C3H8 gas at STP?

Propane has a density of .0018794 g/cm3. in 22.4 liters, there are 22400 cm3, so there are 42.10 grams of propane. The molar mass of propane is 44.10 g/mole, so there are .955 moles. Via Avogadro's number, there are then 5.751 E23 molecules of propane present.


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Since propane has the formula C3H8, each mole of propane will have 8 moles of hydrogen atoms, so 5 moles of propane will contain 5x8=40 moles of hydrogen.


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