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The chemical name for molecular formula C3H8 is propane. Propane has a weight of 44.10 grams per mole. Carbon (C) has a weight of 12.01 grams per mole. 1 mole of propane contains 3 moles of carbon. Therefore 81.70 percent by mass of propane is C.

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9y ago
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13y ago

Taking the (approximate) values of the molar masses of carbon (~12g) and hydrogen (~1g):

Methane (CH4) = 12*1 + 1*4 = 16g

So the total mass of carbon in methane is a simple ratio, you could call it the contribution in mass of carbon in methane:

%C = (12/16)*100 = 75%

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12y ago

MrCH4 = 16 grams/mole (The Molecular Mass of Methane)

16 grams/mole = ArC + ArH (to find the relative atomic masses of each)

= 12g + 4g

Therefore:

(12g/16g) x 100 = 75 %the relative Atomic Mass of Carbon / Total mass of Methane

So 75 % of Methane is Carbon

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11y ago

62.1%

atomic mass of Carbon =12.01g

formula mass 58.09g

mass% 0f element X= mass of X in 1 mol compound / mass of 1 mol compound

times 100%

12.01 X 3 = 36.03gC / 58.09g C3H6O X 100%

62.1%

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Q: What is the percent by mass of carbon in C3H8?
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