How many moles of ammonia contain each of the following number of molecules?

Question

Note: Reference the Fundamental constants table for additional information.
Be sure your answer has the correct number of significant figures.

7.58x10^26 molecules
7.55x10^22 molecules
4.8x10^24 molecules

Answer 1

1. For 7.58x10^26 molecules of ammonia, we first need to convert the number of molecules to moles using Avogadro's number.

7.58x10^26 molecules * (1 mol / 6.022x10^23 molecules) = 126.00 mol

Therefore, 7.58x10^26 molecules of ammonia contain 126.00 moles (with 4 significant figures).

2. For 7.55x10^22 molecules of ammonia:

7.55x10^22 molecules * (1 mol / 6.022x10^23 molecules) = 0.1254 mol

Therefore, 7.55x10^22 molecules of ammonia contain 0.1254 moles (with 4 significant figures).

3. For 4.8x10^24 molecules of ammonia:

4.8x10^24 molecules * (1 mol / 6.022x10^23 molecules) = 7.97 mol

Therefore, 4.8x10^24 molecules of ammonia contain 7.97 moles (with 3 significant figures).