Frieda makes a solution that contains 5.7 g of KCl dissolved in 200 g of water. What would be your percent by mass of KCl in the water solution?

Answer 1

Hi Gloria I'm Eddie and I can help today feel free to reach out if you need more help.

Molar mass is key idea in Chemistry. The periodic table has all masses of every element so everything in the universe from heavy or dense uranium to lightest gas like hydrogen. Water has one of the most famous chemical formula H 2 O to be clear there are 2 H and 1 O. These letters stand for Hydrogen H and Oxygen O.

Normally you need the moles but in this example your simply getting % mass of a solution. It is important to understand what a solution is think of your favorite drink you make maybe it's lemonade. Let me show you the key words.

Water is typically the solvent in most solutions, and powder (sugar) sometimes liquid (lemon) are mixed into the water they are called solutes in chemistry. Now the lemonade or mixture is called solution.

They asked for solute KCl (salt) over the solution (mixture so salt water).

An equation for percent mass = solute/solution x 100%

5.7g/(200 + 5.7)g x 100% =

The trick here is solution isn't just water but salt water.