The number of molecules in 0.5 mol of ammonia NH3.

Given:
n (NH3) = 0.5 mol
NA = 6.02 * 10 ^ 23 mol − 1

Find:
N (NH3 molecules) -?

Solution:
1) Using the standard formula, calculate the number of ammonia molecules in a given sample:
N (NH3 molecules) = n (NH3) * NA = 0.5 * 6.02 * 10 ^ 23 = 3.01 * 10 ^ 23.

Answer: The number of ammonia molecules is 3.01 * 10 ^ 23.




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