How many molecules of ammonia NH3 are there in 70 grams of it?

univerkov | July 27, 2021 | education

Given:
m (NH3) = 70 g

To find:
N (NH3) -?

1) n (NH3) = m (NH3) / M (NH3) = 70/17 = 4.118 mol;
2) N (NH3) = n (NH3) * NA = 4.118 * 6.02 * 10 ^ 23 = 2.48 * 10 ^ 24.

Answer: The number of NH3 molecules is 2.48 * 10 ^ 24.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.