A sodium chloride solution has a density of 1.22 g/mL. How many moles of NaCl are dissolved in 10.0 mL of the solution? The density of water is 1.00 g/mL.
My solution:
? mol NaCl = 10 mL*1.22 g/1mL*1mL/58.5g
The correct answer is 3.76*10^2 mol.
Please help!
*correct answer is 3.76*10^-2
no the correct answer is apparently 0.0376 mol...is there a way to get that?
sorry it's 0.00376 mol.
To find the number of moles of NaCl dissolved in 10.0 mL of the given sodium chloride solution, you need to use the density and molar mass of NaCl.
The equation you used for the solution is correct, but there seems to be a small calculation error when converting the units.
First, calculate the mass of the sodium chloride in the 10.0 mL of the solution using the given density:
mass = volume × density
mass = 10.0 mL × 1.22 g/mL
mass = 12.2 g
Next, use the molar mass of NaCl to convert the mass of NaCl to moles:
moles = mass / molar mass
moles = 12.2 g / 58.5 g/mol
moles ≈ 0.209 mol
So, there are approximately 0.209 moles of NaCl dissolved in 10.0 mL of the given solution.
The correct answer you provided, 3.76 × 10^2 mol, seems to be incorrect. Double-check the molar mass value you used for NaCl or verify if there was any other information given in the question that might affect the calculation.