Answer:
28.9
Explanation:
4.5+24.4
= 28.9
Mark me as a brainlist.I hope this helps you.
Heating a substance causes molecules to speed up and spread slightly further apart, occupying a larger volume that results in a decrease in density. Cooling a substance causes molecules to slow down and get slightly closer together, occupying a smaller volume that results in an increase in density.
From: www.middleschoolchemistry.com
The balanced equation is 2HgO --> 2Hg + O2
