Question

How many liters of a 2.00 M KBr solution are needed to obtain 3.00 moles of KBr?

a) 0.75 L
b) 1.50 L
c) 3.00 L
d) 6.00 L

Answer 1

To obtain 3.00 moles of KBr from a 2.00 M KBr solution, 1.50 liters of the solution are needed, making the correct answer (b) 1.50 L.

Step-by-step explanation:

The question at hand is how many liters of a 2.00 M KBr solution are needed to obtain 3.00 moles of KBr. To find the volume required, we use the molarity equation, M = moles/volume (L), where M is the concentration in molarity, moles is the amount of the solute, and volume is the solution volume in liters. We rearrange the formula to solve for volume: volume (L) = moles / M.

For a solution with a molarity (M) of 2.00 and a desired quantity of 3.00 moles of KBr, the volume can be calculated as follows:

Volume (L) = moles / M = 3.00 moles / 2.00 M = 1.50 L.

Therefore, option (b) 1.50 L is the correct answer.