Question

What mass of KCl will produce a saturated solution in 500.0g of water at 20°C? The molar solubility of KCl at this
temperature is 0.456 mol/100.0g

Answer 1

Answer:

2.28mol or 170.0g

Explanation:

to get this answer you have to find the Molar mass of KCL, which is just the Molar mass of both of them added together.  

(in this case, K=39.0983 + Cl=35.453)

In this case the answer is 74.5513g per mol ("sciencing.com" for the molar masses)

Next you times that number by however many mol can dissolve in 500g of water at 20°C which is:

0.456 × (500 ÷ 100) = 2.28

Now we just times our Molar mass number by however many mol we have (2.28) to get:

74.5513g × 2.28mol = 169.976964g

or 170g of KCl

I hope this makes sense