How many moles of KBr

are present in 100. mL
of a 0.105 M
solution?

The first step is to calculate the number of moles of KBr in the solution using the formula:

moles = Molarity x Volume

moles = 0.105 mol/L x 0.100 L
moles = 0.0105 moles

Therefore, there are 0.0105 moles of KBr present in 100. mL of a 0.105 M solution.