What mass of water should be added to 22.0 g of KCl to make
a 5.50 % by mass solution?_ gH20
Enter the answer

The correct answer is 378 g of water

Explanation:

A concentration of 5.50% by mass means that there are 5.50 grams of solute in 100 grams of solution:

5.50 %m/m = 5.50 g solute/100 g solution

If we have 22.0 g of solute (KCl), we found the total mass of solution as follows:

5.50 g KCl 100 g solution

22.0 g KCl X = 22.0 g KCl x 100 g solution/ 5.50 g KCl = 400 g solution

22.0 g KCl/400 g solution = 5.5 g KCl/100 g solution = 5.50 % m/m

This is the total mass of solution (400 g). The mass of water we have to add is the following:

Mass water = 400.0 g solution - 22.0 g KCl = 378.0 g

So, in order to prepare a 5.50% m/m of solution, we have to weight 22.0 g of KCl and to add 378.0 g of water until reaching 400.0 g of total mass solution.

a rain shadow is a dry region of land on the side that is protected against the prevailing winds of a mountain range. the prevailing winds are the winds that occur most of the time in a particular place of the earth

prevailing winds carry air toward the mountain range. as the air rises up over a mountain range, the air cools, water vapor condenses, and clouds form. on this side of the mountains, called the windward side, precipitation falls in the form of  rain  or snow. this dry air produces a  rain shadow.

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year