Moles = mass / molar mass
molar mass of O2 is 32
therefore moles = 72/32
= 2.25 moles
Answer:
2+
Explanation:
The charge on Z in the compound ZB₂ is a 2+
From the given compound:
We know that Br is bromine with a charge of -1;
So;
Using the combining power approach:
Atoms Z Br
Combining power 2 1
Exchange of valency 1 2
So;
The charge on Z is 2+
2
Compounds are represented by chemical formulas
Hydrogen and oxygen are different elements.
when two or more elements combine, they form a compound
hence, two molecules of hydrogen and one molecule of oxygen combine to form water as a compound
