How many O atoms are in 125g of Glucose (C6H12O6)

Answer 1

Cordell,

In order to continue to work problems such as these you need to remember how to convert grams to mole; the relationship between the formula of a compound and the moles of the atoms in the compound and Avogadro #.

Remember the relationships between mass → mole compound → mol atoms → # of atoms:

You are given 125 g of C₆H₁₂O. which has a molar mass of 180 g/mol

You will need to convert the grams to moles... divide by the molar mass

Also remember the concept that 1 mol of a substance or particle = 6.02 x10²³ particles.

For glucose or any compound, the formula represents one mol of the compound but we can look at the individual elements involved in the 1 mol of the substance.

1 mol C₆H₁₂O₆ has 6 moles of carbon 12 moles hydrogen and 6 moles oxygen. We can use this relationship to get the # of oxygen atoms as follows:

(125 g C₆H₁₂O₆ ) x (1 mol C₆H₁₂O₆/180. g C₆H₁₂O₆) x (6 mol O atoms / 1 mol C₆H₁₂O₆) x (6.02x10²³ O atoms/1 mol O atoms) = 2.51 x10²⁴ atoms