This is the chemical formula for a hydro carbon called propane : c3h3. what does this formula tell you about a molecule of propane

Propane has chain of three carbon atoms, with a chemical formula of C3H8, because a chain of three carbons require {2(3)+2} hydrogen atoms, which equals eight.

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.

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