According to Avogadro's Number there are 6.022 *10^23 molecules in 1 mol. So:
1 mol of glucose = 6.022 * 10^23 molecules of glucose
We can use that ratio to find the answer to our problem.
number of molecules of glucose = 0.068 moles * 6.022 * 10^23 molecules/(1 mol)
number of molecules of glucose = 4.09 *10^22 molecules
Answer: there are 4.09 *10^22 molecules of glucose in 0.068 moles of it.
