how many atoms are there in 3.4 grams of ammonia

Ammonia is NH₃ 

The molar mass (reading from the periodic table) is 17.031g/mol

Therefore 3.4 grams of ammonia is equal to 0.1996359579590159 moles of ammonia.

Multiplying this by 6.022 * 10²³ we get 120220773882919374980000 molecules (or 1.2022 * 10²³ molecules).

In 1 molecule of ammonia there are 4 atoms, so in total there are approx. 4.8088 * 10²³ atoms.

The measurement was made using 2 significant figures, so we can only be sure about this result to 2 significant figures, therefore the amount of atoms in 3.4g of ammonia is approx. 4.8 * 10²³ atoms.

https://www.wolframalpha.com/input/?i=how+many+atoms+is+in+3+grams+of+ammonia

Type in any other element instead of "ammonia" to get that too, in this case it's approxamitely 4.243*10^23 atoms.

Wolfram is great! I asked it what percentage of the average banker is blarney. Result: 31.32%

I asked it what is the percentage of blarney in a certified Blarney Banker. Result: 99.44%