How many moles of KBr are there in 35.8ml of a 0.172M solution?

To determine the number of moles of KBr in the solution, we need to use the formula: moles = concentration (M) × volume (L).

Given:
Concentration (M) = 0.172 M
Volume (ml) = 35.8 ml

First, convert the volume from milliliters (ml) to liters (L) by dividing by 1000:
Volume (L) = 35.8 ml ÷ 1000 = 0.0358 L

Now we can calculate the number of moles of KBr:
Moles = 0.172 M × 0.0358 L = 0.0061496 moles

Therefore, there are approximately 0.0061496 moles of KBr in 35.8 ml of a 0.172 M solution.