The molecular formula of glucose is C6H12O6, which means it contains 6 carbon atoms.
To calculate the mass of carbon in 100g of glucose, we can use the molar mass of glucose and the molar mass of carbon to find the mass fraction of carbon in glucose:
The molar mass of glucose (C6H12O6) is 180.16 g/mol (6 carbon atoms x 12.01 g/mol + 12 hydrogen atoms x 1.01 g/mol + 6 oxygen atoms x 16.00 g/mol).
The molar mass of carbon is 12.01 g/mol.
The mass fraction of carbon in glucose is:
(6 carbon atoms x 12.01 g/mol) / (1 molecule of glucose x 180.16 g/mol) = 0.4
This means that 40% of the mass of glucose comes from carbon. Therefore, in 100g of glucose, there would be:
100g x 0.4 = 40g of carbon.
So, there are 40 grams of carbon in 100g of glucose.