# Calculate the mass of 160 glucose molecules.

The number of molecules and the mass of a substance are linked by the concepts of Avogadro’s number and the amount of substance.

Avogadro’s number is a constant that shows how many particles are contained in 1 mole of a substance. By calculating the molar mass and knowing the number of moles and the number of molecules, you can find the mass.

Let’s find the molar mass of glucose.

M (C6H12O6) = 12 * 6 + 1 * 12 + 16 * 6 = 180 g / mol.

Na = 6.02 * 10 ^ 23

Let’s make a proportion.

1 mole of glucose – 6.02 * 10 ^ 23 molecules

x mole of glucose – 160 molecules

x (C6H12O6) = 160 / (6.02 * 10 ^ 23) = 26.6 * 10 ^ -23

m (C6H12O6) = n * M = 180 * 26.6 * 10 ^ -23 = 4.8 * 10 ^ -20 g

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