Calculate the concentration, in percent by mass, of a refrigerant brine solution which is 4.03 M in NaCl with a density of 1.116 g mL-1.

detailed answer, please, i don't understand how to do this at all!!!

Assume some volume, say 1 liter.

Then the mass is 1116grms, from the density.

4.03=moles/lites >> 4.03moles in solution.

mass solute= 4.03*molmassNaCl= 4.03*53

percentmass= masssolute/massollution * 100

Just a quick note to say Bob P obviously hit the wrong key for molar mass NaCl. You should confirm this number yourself. It's closer to 58.5 but that isn't exact.

thanks a lot guys, i got it!!! :)

To calculate the concentration of a solution in percent by mass, we need to determine the mass of the solute (NaCl) relative to the total mass of the solution. In this case, the solution is made up of NaCl and water.

Firstly, let's determine the mass of the NaCl in the solution. We know the molarity (M) of the solution, which is 4.03 M. Molarity is defined as moles of solute per liter of solution. Therefore, the number of moles of NaCl can be calculated using the equation:

moles of NaCl = Molarity × volume of solution in liters

In this case, we don't have the volume explicitly given, but we can use the density to find the volume. Density is defined as mass per unit volume (g/mL). Rearranging the equation, we have:

volume of solution = mass of solution / density

Since we are given the density of the solution as 1.116 g/mL, we can rearrange the equation to find the mass of the solution:

mass of solution = volume of solution × density

Now, let's calculate the mass of the NaCl in the solution. We can multiply the molarity by the volume:

moles of NaCl = 4.03 M × volume of solution (in liters)

Next, we need to convert moles of NaCl to grams of NaCl. We can use the molar mass of NaCl, which is 58.44 g/mol, to convert between moles and grams. Multiply the moles by the molar mass:

grams of NaCl = moles of NaCl × molar mass of NaCl

So far, we have calculated the mass of NaCl in grams. To find the percent by mass, we need to divide this mass by the total mass of the solution and multiply by 100:

% mass of NaCl = (grams of NaCl / mass of solution) × 100

By following these calculations, you should be able to determine the concentration of the refrigerant brine solution in percent by mass.