5) Propane gas, C:Hs, is used as a fuel source for barbeques and furnaces. Answer the following questions. Show your work for credit
a) How many moles of H are in 34.0 g of propane?
b) How many grams of C are in 1.50 mole of propane?
c) How many grams of C are in 34.0 g of propane?
d) How many grams of H are in 0.224 g of propane?

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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