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Lysine, an essential amino acid in the human body, contains C, H, O, and N. In one experiment, the complete combustion of 2.175 g of lysine gave 3.94 g CO2 and 1.89 g of H2O. In a seperate experiment, 1.873 g of lysine gave 0.436 g NH3.  A.) Calculate the empirical formula of lysine. B.) The approximate molar mass of lysine is 150 g/mol. What is the moleular formula of the compound?

Question

Lysine, an essential amino acid in the human body, contains C, H, O, and N. In one experiment, the complete combustion of 2.175 g of lysine gave 3.94 g COand 1.89 g of H2O. In a seperate experiment, 1.873 g of lysine gave 0.436 g NH3

 

A.) Calculate the empirical formula of lysine. 

B.) The approximate molar mass of lysine is 150 g/mol. What is the moleular formula of the compound?

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Step 1

The atomic masses are

C: 12.011 u

H: 1.008 u

N: 14.007 u

O: 15.999 u

The gram molar masses are

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Step 2

2.175 g lysine furnished 3.94 g CO2 and 1.89 g H2O. In a separate experiment, 1.873 g lysine gave 0.436 g NH3. Using the given information, we determine the weights of CO2, H2O and NH3 corresponding to 100 g lysine.

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Step 3

Next, we determine the amounts of C, H, N...

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