How would I make 500 ml's of a .35M NaCI solution. MW= 58.44

( I know how to do the first part)

How many micromoles of NaCI would be present in that solution?

What would be the percentage of NaCI in that solution?

How many mols do you want? That's M x L = 0.35 x 0.500 = 0.175 mols.

Then grams = mols x molar mass = 0.175 x 58.44 = approx 10.3 grams NaCl but you need to get a more accurate number.

b. There are 0.175 mol and that x 1E6 to give micromoles.

c. % what? w/w; w/v; ? I will assume you want % mass/volume
%NaCl = grams NaCl/100 g solution
You have approx 10.3g in 500 mL or
(10.3g/500)*100 = % w/v

thanks that is exactly how the teacher gave us the questions

To make 500 mL of a 0.35 M NaCI solution, you will need to follow these steps:

Step 1: Calculate the amount of NaCI needed.
To determine the amount of NaCI needed, you can use the formula:

mass (g) = volume (L) x molarity (mol/L) x molecular weight (g/mol)

Given:
Volume (V) = 0.5 L (since 500 mL is equal to 0.5 L)
Molarity (M) = 0.35 mol/L
Molecular weight (MW) = 58.44 g/mol

mass (g) = 0.5 L x 0.35 mol/L x 58.44 g/mol
= 10.221 g

So, you would need 10.221 grams of NaCI to make 500 mL of a 0.35 M solution.

Step 2: Dissolve NaCI in a solvent (e.g., distilled water).
Weigh out 10.221 grams of NaCI using a balance and then add it to a container. Next, add distilled water to the container gradually, while stirring, until the total volume reaches 500 mL. Ensure the NaCI is fully dissolved.

Now, let's move on to your next questions:

Question 1: How many micromoles of NaCI would be present in that solution?
To find the micromoles (μmol) of NaCI, you can use the formula:

micromoles (μmol) = moles (mol) x 10^6

Given:
moles (mol) = Molarity (M) x Volume (L)

Let's calculate:
moles (mol) = 0.35 mol/L x 0.5 L
= 0.175 mol

micromoles (μmol) = 0.175 mol x 10^6
= 175,000 μmol

Therefore, there would be 175,000 micromoles of NaCI in the solution.

Question 2: What would be the percentage of NaCI in that solution?
The percentage of NaCI in the solution can be calculated using the formula:

% NaCI = (mass of NaCI / mass of solution) x 100

Given:
mass of NaCI = 10.221 g
mass of solution = 500 g (since 500 mL of water is approximately equal to 500 g)

Let's calculate:
% NaCI = (10.221 g / 500 g) x 100
≈ 2.04%

Therefore, the NaCI solution would have a NaCI concentration of approximately 2.04%.