Express 2.5M NaCl as a percent solution. what is the molar concentration of a 10% NaCl solution?

1.7M

To express 2.5M NaCl as a percent solution, we need to find the amount of NaCl in grams present in 1 liter of the solution.

The molar mass of NaCl (sodium chloride) is approximately 58.44 g/mol. "M" in 2.5M represents moles per liter.

To find the grams of NaCl in 2.5M solution, we can calculate as follows:
2.5 moles NaCl/Liter x 58.44 g NaCl/mole = 146.1 g NaCl/Liter

Therefore, 2.5M NaCl is equivalent to a 146.1% NaCl solution.

Now, let's calculate the molar concentration of a 10% NaCl solution.

Assuming the 10% NaCl solution means 10 grams of NaCl in 100 mL of solution:

First, convert 100 mL to liters:
100 mL ÷ 1000 mL/L = 0.1 L

Next, calculate the number of moles of NaCl:
10 grams NaCl x (1 mole NaCl / 58.44 grams NaCl) = 0.171 moles NaCl

Finally, divide the moles of NaCl by the volume of the solution in liters:
0.171 moles NaCl ÷ 0.1 L = 1.71 M

Therefore, a 10% NaCl solution has a molar concentration of 1.71M.

To express 2.5M NaCl as a percent solution, you need to determine the mass of NaCl dissolved in 100 ml (or 100 g) of the solution.

First, let's understand what "2.5M NaCl" means. "M" stands for molarity, which is a measure of the number of moles of solute (in this case, NaCl) dissolved in one liter of solution. Therefore, a 2.5M NaCl solution contains 2.5 moles of NaCl dissolved in each liter of solution.

To convert this to a percent solution, you'll need to calculate the mass of NaCl dissolved in 100 ml of solution. One liter is equal to 1000 ml, so to find the mass of NaCl in 100 ml of 2.5M NaCl solution, you can use the following formula:

Mass (g) = Moles × Molar mass

The molar mass of NaCl is approximately 58.44 g/mol. Plugging in the values, you get:

Mass (g) = 2.5 mol × 58.44 g/mol = 146.1 g

Therefore, 100 ml (or 100 g) of a 2.5M NaCl solution contains 146.1 g of NaCl.

Now, let's move on to the molar concentration of a 10% NaCl solution. A 10% NaCl solution means that 10 g of NaCl is dissolved in 100 ml (or 100 g) of solution.

To find the molar concentration, you need to convert grams of NaCl to moles. Rearranging the formula mentioned earlier:

Moles = Mass (g) ÷ Molar mass

For a 10% NaCl solution, the moles of NaCl can be calculated as:

Moles = 10 g ÷ 58.44 g/mol ≈ 0.171 moles

Since the volume of the solution is 100 ml, which is equivalent to 0.1 liters, the molar concentration (C) in Molarity (M) can be determined as:

C = Moles ÷ Volume (in liters)

C = 0.171 moles ÷ 0.1 L ≈ 1.71 M

Therefore, the molar concentration of a 10% NaCl solution is approximately 1.71 M.

What kind of percent is that? percent w/v

2.5M means 2.5 moles NaCl/L soln.
grams = moles x molar mass
So yo have grams/L, convert to g/100 mL and that is percent NaCl.

10%w/v means 10g NaCl/100 mL which makes it 100 g NaCl/L soln.
100 g = ? moles. moles = g/molar mass so that is the molarity.