Biology factor label question

Question

How many atoms of Hydrogen can be found in 90 g of ammonia, NH3? 

1 mole NH3 = 17 grams (How do we know?)

1 mole NH3 = 6.022 x 1023 molecules

1 molecule of NH3 has 3 atoms of hydrogen

SHOW ALL OF YOUR WORK! 

(Use scientific notation.)  

Answer 1

This is going to be very simple as it essentially tells you the steps to follow in your question.

First convert 90g of NH₃ into moles of NH₃ as follows by diving by the molar mass.

90g NH₃ /17.03 g/mol= 5.28 moles NH₃

Next, convert the moles of NH₃ into molecules of NH₃ by multiplying by Avogadro's number.

5.28 moles NH₃ *6.022x²³= 3.18x10²⁴ molecules of NH₃

Finally, multiply the number of molecules of NH₃ by three to account for each molecule of NH₃ having three hydrogen atoms

3.18x10²⁴ *3= 9.55x10²⁴ hydrogen atoms present