How much water must be added to 40.0 g of CaCl₂ to produce a solution that is 35.0 wt% CaCl₂? A)54.0 g B)74.3 g C)87.5 g D)114 g

Question

Quizplus · Accepted Answer

First, we need to calculate the mass of CaCl2 needed to make the desired solution:

Mass of CaCl2 = 40.0 g / (1 - 0.35) = 61.5 g

Now we can use the formula for weight percent:

35.0 = (mass of CaCl2 / total mass) x 100

Solving for the total mass:

total mass = mass of CaCl2 / (weight percent / 100) = 61.5 / 0.35 = 175.7 g

Finally, we can calculate the amount of water needed:

water = total mass - mass of CaCl2 = 175.7 - 61.5 = 114.2 g

So the answer is B) 114 g.

How Much Water Must Be Added to 40