Answer :

Final answer:

To convert 38.1 grams of NaBr to formula units, calculate the number of moles using the molar mass of NaBr and then multiply by Avogadro's number. This results in approximately 2.228×1023 formula units.

Explanation:

The question asks us to convert 38.1 grams of NaBr to formula units. Here's a step-by-step process:

  1. First, we calculate the molar mass of NaBr. Na (sodium) has an atomic mass of 22.99 amu, and Br (bromine) has an atomic mass of 79.90 amu. Therefore, the molar mass of NaBr is (22.99 + 79.90) = 102.89 g/mol.
  2. To convert grams to moles, we use the molar mass of NaBr: 38.1 g × (1 mol / 102.89 g) = 0.370 mol NaBr.
  3. Since each mole of NaBr contains Avogadro's number of formula units, which is approximately 6.022×1023 units/mol, we then calculate the number of formula units in 0.370 mol: 0.370 mol × (6.022×1023 units/mol) = 2.228×1023 formula units.

In summary, 38.1 grams of NaBr is equal to approximately 2.228×1023 formula units.

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