How many O atoms are in 2.1 moles of Glucose?

Answer 1

First look up the molecular formula of glucose. When you do, you'll find it is C₆H₁₂O₆ meaning that there are 6 atoms of oxygen in one molecule of glucose.

Using Avogadro's number, there are 6.022 x 10²³ molecules in one mole of glucose so for 2.1 moles, there would be (2.1)(6.022 x 10²³) = 12.646 x 10²³ or 1.2646 x 10²⁴ molecules of glucose in 2.1 moles of glucose. Since there are 6 oxygen atoms in each one, there are (6)(1.2646 x 10²⁴) = 7.58772 x 10²⁴ atoms of oxygen but, when you round to 2 sig figs, you get 7.6 x 10²⁴

Answer 2

Glucose molecular formula = C₆H₁₂O₆

Avogadro's number = 6.02214076×10²³

(2.1 mol Glucose)*(6.022*10^23 molecules/mol)*(6 atoms O/molecule) = 7.58772*10^24 = 7.6*10^24 atoms O.