MediumChemistryHigh School (9–10)GeneralAtoms and Molecules › Molecules, Ions and FormulaeNumericalBoard Exam
How many atoms of hydrogen, nitrogen and oxygen are there in 2 HNO₃ and 3 H₂O taken together? …
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
How many atoms of hydrogen, nitrogen and oxygen are there in and taken together? How many atoms are there in all?
Need a reminder? The key ideaShow
A molecule is a group of atoms joined together. Its atomicity is the number of atoms in it. A small number after a symbol counts atoms in one molecule; a number in front counts molecules; a number after a bracket multiplies everything inside.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. . Hydrogen , nitrogen , oxygen .
Step 2. . Hydrogen , oxygen .
Step 3. Together. Hydrogen , nitrogen , oxygen : atoms in all.
Answer: hydrogen, nitrogen, oxygen; atoms.
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