26Mar/11Off
Acid Fat
Acid Fat
Myristic acid is a fat found in dairy products.?
Myristic acid is a fat found in dairy products. The percent composition of myristic acid determined through a combustion experiment is 73.63% carbon, 12.36% hydrogen, and 14.01% oxygen. The molecular weight of myristic acid is 228.38 g/mol.
a)How many moles of carbon are present in 100 g sample?
b)How many moles of hydrogen are present in 100 g sample?
c)How many moles of oxygen are present in 100 g sample?
d)What is empirical formula for myristic acid?
e)What is the molecular formula for myristic acid?
1) determine the number of moles of carbon, hydrogen and oxygen in 100 gram.
carbon: 73.63 g/12.01 g/mol = 6.1307 mol
hydrogen: 12.36 g/1.008 g/mol = 12.262 mol
oxygen: 14.01 g/16.00 g/mol = 0.8756 mol
2) divide each molar amount by the lowest value to obtain small integers
carbon: 6.1307/0.8756 = 7.00
hydrogen: 12.262 / 0.8756 = 14.00
oxygen: 0.8756 / 0.8756 = 1.00
The empirical formula of the substance is (C7H14O)k
The atomic masses add up to 114.19. Therefore k=2 and the molecular formula is C14H28O2.
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