Final answer:
To find the mass of 9.00 × 10²² molecules of NH₃, divide that number by Avogadro's number to get moles and multiply by NH₃'s molar mass of 17.03 g/mol.
Step-by-step explanation:
To calculate the mass of 9.00 × 10²² molecules of NH₃, we need to use Avogadro's number and the molar mass of NH₃. Avogadro's number is 6.022 × 10²³, which represents the number of units in one mole of a substance. The molar mass of NH₃ is 17.03 grams per mole, which can be calculated by adding the atomic masses of nitrogen and three hydrogen atoms. Here is a step-by-step calculation:
- First, we determine the number of moles of NH₃ by dividing the provided number of molecules by Avogadro's number: (9.00 × 10²² molecules) / (6.022 × 10²³ molecules/mol).
- Next, we multiply the number of moles of NH₃ by its molar mass (17.03 g/mol) to find the mass.
Completing these steps will give us the mass of NH₃ corresponding to 9.00 × 10²² molecules.