Question

Iron(II) sulfide has a molar mass of 87. 91 g/mol. 50 grams of this substance would contain about 3. 011 x 1023 molecules.

true or false?​

Answer 1

False

Explanation:

The number of molecules in a mole of any substance is Avogadro's number, 6.022×10^23. The number of moles of a substance is the mass of it divided by the mass per mole. Here, we expect the number of molecules to be about ...

(6.022×10^23 molecules/mole) × (50 g)/(87.91 g/mole)

≈ 3.425×10^23 molecules

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The suggested number is approximately 12% low, too far off to be considered "about" correct. The offered statement is FALSE.