Chemistry Homework Help

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Jun 10th, 2015

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The molar mass of CH2 is 14.0267 g/mol. 
(42 g/mol) / (14.0267 g/mol) = 3 to the nearest whole number 
So multiply the empirical formula by 3: 
                                                 C3H6


2=

 each one determine the number of moles of each atom in a given sample. 

moles = mass / molar mass 


10. 
moles Pb = 38.43 g / 207.2 g/mol = 0.1855 mol 

moles C = 17.83 g / 12.01 g/mol = 1.485 mol 

moles H = 3.74 g / 1.008 g/mol = 3.710 moles 

Now ratio Pb : C : H 
= 0.1855 : 1.485 : 3.710 

divide each number in the ratio by the smallest number 
Pb : C : H 
(0.1855/ 0.1855) : (1.485 / 0.1855) : (3.710 / 0.1855) 
1 : 8 : 20 

empirical formula 
PbC8H20 

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Jun 10th, 2015

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