Question

Calculate the total number of hydrogen atoms and hydrogen molecules present in 1.7 gram of
ammonia.

Answer 1

Answer:

This is because the molar mass of ammonia is N (14 amu) + 3 x H (1 amu) = 17 amu, and a mole is one gram of weight per amu so 17 grams in a mole. By definition, a mole is 6.022 x 10^23 atoms. Now, 1.7 grams is one tenth of a mole of ammonia, so the number of atoms would be one tenth of what it is for a mole, so 6.022 x 10^22.