How many C atoms are in 639 mol of sucrose?

Answer 1

The formula for sucrose is C₁₂H₂₂O₁₁. So there are 12 atoms of C in one molecule of sucrose. Since there are 6.022 x 10²³ atoms in one mole (of anything) and you have 639 moles of the sucrose, you can find the result this way:

(12 atoms C/1 molecule sucrose)(6.022 x 10²³ molecules sucrose/1 mol sucrose) 639 mol sucrose = 4.62 x 19²⁷ atoms of C