Tartaric acid is the white, powdery substance that coats tart candies such as Sour Patch Kids. COmbustion analysis of a 12.01g sample of tartaric aid, which contains carbon, hydrogen and oxygen, produces 14.08g CO2 and 4.32g H2O. Determine the empirical formula of the acid.
Empirical formula:the simplest positive integer ratio of atoms that is present in a compound is called the empirical formula of that compound.
the empirical formula can be calculated as follows:
first find moles of carbon dioxide and then find the mass of carbon as follows:
mass of carbon dioxide=14.01gram
molar mass of carbon dioxide=44.01gram/mol
substitute these values in the above equation (1),
mass of carbon=0.3183mol×12.011g-mol-1
now find moles of water and then the mass of hydrogen as follows:
mass of water=4.32g
the molar mass of water=18.01g-mol-1
substitute these values in the above equation (2)
mass of tartaric acid is given=12.01g
therefore the mass of oxygen can be calculated as
mass of oxygen=massof tartaric acid-(mass of carbon + mass of hydrogen)
mass of oxygen=12.01g-(3.824g + 0.4835g)
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