The mass of 1 mol of molecules in grams is numerically equivalent to the mass of how many molecules in atomic mass units?

The mass of 1 mol of molecules in grams is numerically equivalent to the mass of how many molecules in atomic mass units?

  • Correct Answer: one
  • half
  • ten
  • two

Explanation: The mole concept can be extended to masses of formula units and molecules as well. The mass of 1 mol of molecules (or formula units) in grams is numerically equivalent to the mass of one molecule (or formula unit) in atomic mass units. For example, a single molecule of O2 has a mass of 32.00 u, and 1 mol of O2 molecules has a mass of 32.00 g. As with atomic mass unit–based masses, to obtain the mass of 1 mol of a substance, we simply sum the masses of the individual atoms in the formula of that substance. The mass of 1 mol of a substance is referred to as its molar mass, whether the substance is an element, an ionic compound, or a covalent compound.

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