An aqueous solution of nacl has a mole fraction of 0.21. what is the mass of nacl dissolved in 100.0 ml of solution

- 46.4 g of NaCl is dissolved.

Solution:- Mole fraction of NaCl = 0.21

Since we have an aqueous solution of NaCl, it means NaCl is dissolved in water.

sum of mole fractions is always 1.

So, mole fraction of water = 1 - mole fraction of NaCl

mole fraction of water = 1 - 0.21 = 0.79

If we have total 1 mol of the solution then there are 0.21 moles of NaCl and 0.79 moles of water.

mass of NaCl = 0.21 x 58.44 = 12.3 g

mass of water = 0.79 x 18.0 = 14.2 g

If we assume the density for the solution is 1g/mL then 100.0 mL solution is 100 g solution.

From mass of NaCl and water, the mass of solution = 12.3 + 14.2 = 26.5g

From here, 26.5 g of solution has 12.3 g of NaCl. 100 g of solution has how many grams of NaCl?

We could use the proportions here..

12.3/26.5 = X/100

12.3(100) = 26.5(X)

X = 1230/26.5

X = 46.4

So, 46.4 g of NaCl is dissolved in 100.0 mL of solution.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).