Achemist prepares a solution of sodium carbonate (na2co3) by measuring out 28 î¼gol sodium carbonate into a 300ml volumetric flask and filling the flask to the mark with water. calculate the concentration in î¼mol of the chemist's sodium carbonate solution. round your answer to significant digits.

Question in incomplete , complete question is;

A chemist prepares a solution of sodium carbonate by measuring out  28μg of sodium carbonate into a  300 mL volumetric flask and filling the flask to the mark with water.

Calculate the concentration in μmol/L of the chemist's sodium carbonate solution. Be sure your answer has the correct number of significant digits.

is the concentration of the chemist's sodium carbonate solution.

Explanation:

Mass of sodium carbonate = 28μg =

Volume of the solution = 300 mL = 300 × 0.001 L= 0.3 L

( 1 mL = 0.001 L)

Moles of sodium carbonate =

is the concentration of the chemist's sodium carbonate 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).