Water keeps living organisms alive
PV=nRT
n = mole = 2.1 g : 32 g/mole = 0.065
T = 13 + 273 = 286 K
V = nRT/P
V = (0.065 x 0.08205 x 286)/0.1
V = 15.253 L
The reaction is a substitution reaction since bromide ion was replaced by hydroxide ion.
<h3>What is a chemical reaction?</h3>
A chemical reaction is a change which results in a the permanent rearrangements of the atoms and constituents of a substance such that new substances are formed.
The given reaction is a as follows:

Bromide ion was replaced by hydroxide ion.
Therefore, the reaction is a substitution reaction.
Learn more about chemical reactions at: brainly.com/question/16416932
Adding hot cocoa to hot water would be a chemical change