How many molecules of glucose (C6H12O6 molecular mass = 180 daltons) would be present in 90 grams of glucose?

Question

Quizplus · Accepted Answer

The number of moles of glucose can be calculated as follows:

moles of glucose = mass of glucose / molar mass of glucose
moles of glucose = 90 g / 180 g/mol
moles of glucose = 0.5 mol

One mole of glucose contains 6.02 x 10^23 molecules. Therefore:

number of molecules of glucose = moles of glucose x Avogadro's number
number of molecules of glucose = 0.5 mol x 6.02 x 10^23 molecules/mol
number of molecules of glucose = 3.01 x 10^23 molecules

Therefore, 90 grams of glucose contains 3.01 x 10^23 molecules, which is closest to answer choice E, (90/180) x 6.02 x 10^23.

How Many Molecules of Glucose (C6H12O6 Molecular Mass = 180