What percent composition of glucose is carbon?

Glucose is a 6 carbon molecule of ##C_6H_12O_6##

The of carbon in the molecule is determined by comparing the mass of carbon in the molecule versus the total mass of the molecule.

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To begin we need to find the molar mass (gram formula mass of the glucose molecule.

carbon has a mass of 12.01 amu (mass from the periodic table) hydrogen has a mass of 1.01 amu oxygen has a mass of 15.99 amu

C 6 x 12.01 = 72.06 (atom number x amu) H 12 x 1.01 = 12.12 O 6 x 15.99 = 95.94

72.06 + 12.12 + 95.94 = 180.12 ##(g)/(mol)##

To determine the percent composition compare the mass of each element to the total mass of the molecule.

C ##(72.06)/(180.12)## = 0.400 or 40%

H ##(12.12)/(180.12)## = 0.067 or 6.7%

O ##(95.94)/(180.12)## = 0.533 or 53.3%

The percent composition of glucose is 40% carbon, 6.7% hydrogen and 53.3% oxygen.

Here are YouTube videos I made for percent composite and gram formula mass:

I hope this was helpful. SMARTERTEACHER


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