An autopipette was used to place 5.00 mL of commercial bleach, weighing 5.560 g, into a volumetric flask. It was then diluted to a total volume of 50.00 mL. A 10.00-mL sample of the diluted solution was placed in an
Erlenmeyer flask. What is the mass, in grams, of commercial bleach in the 10.00-ml sample of the diluted
solution in the Erlenmeyer flask?

1.112 grams

Explanation:

The mass of commercial bleach in the 10.00 mL sample of the diluted solution in the Erlenmeyer flask would be 1.112 grams.

5.00 mL containing 5.560 g of bleach was diluted to a total volume of 50.00 mL. This means that there is 5.560 g of bleach in the 50.00 mL of the diluted sample. 10.00 mL was taken out of the 50.00 mL dilution:

50.00 mL contains 5.560 g of bleach

10.00 mL of the sample will, therefore, contain:

                      5.560 x 10.00/50.00 = 1.112 g

10.00 mL of the sample will contain 1.112 g of bleach.

c. heat could easily travel through the molecules in the air and escape/enter the flask. removing the air slows down the heat transfer.  

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).