If 3.011 ×10²³ molecules have a mass of 20.04 grams,what is the molar mass of this substance?

Question

Quizplus · Accepted Answer

To find the molar mass, we need to divide the mass by the number of molecules (or particles) present in the given sample.

Molar mass = Mass / Number of particles

Number of particles can be calculated by dividing the given value by Avogadro's number:

Number of particles = 3.011 × 10^23 / 6.022 × 10^23 = 0.500 × 10^0

Now we can calculate the molar mass:

Molar mass = 20.04 g / 0.500 × 10^0 = 40.08 g/mol

Therefore, the correct answer is A, 40.08 g/mol.

If 3011 ×1023 Molecules Have a Mass of 20