Calculate the percentage by mass of nitrogen in an ammonia molecule (NH​​​​​​​3) . Take the relative atomic masses of hydrogen and nitrogen to be 1 and 14 respectively.

Calculating the mass of 1 molecule of ammonia:

Mass = ( Number of hydrogen atoms x Mass of hydrogen atom) + ( Number of nitrogen atoms x Mass of nitrogen atoms)

Mass = ( 3 x 1 ) + ( 1 x 14) = 17

Calculating percentage by mass

Percentage by mass of nitrogen = ( Mass of nitrogen atom / Mass of ammonia molecule ) x 100 = ( 14 / 17 ) x 100 = 82%

ND
Answered by Nic D. Chemistry tutor

25834 Views

See similar Chemistry GCSE tutors

Related Chemistry GCSE answers

All answers ▸

What are the keypoints involved in ionic bonding?


Why is graphene able to conduct electricity.


What is the relative formula mass of CaCO3?


Why does graphite conduct electericity but diamond does not if both substances have a giant covalent structure?


We're here to help

contact us iconContact usWhatsapp logoMessage us on Whatsapptelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences