Blood serum in healthy adults normally contains approximately 3.2 mg/ml of sodium ions (na+) and approximately 3.5 mg/ml of chloride ions (cl−).
how many milliliters of blood serum would be needed to obtain 3.1 g of na+?
how many milliliters of blood serum would be needed to obtain 3.1

968.75 mL of blood serum are needed to obtain 3.1 g of Na⁺

885.71 mL of blood serum are needed to obtain 3.1 g of Cl⁻

Explanation:

Knowing that the blood serum contains 3.2 mg/mL of sodium ions (Na⁺) we devise the following reasoning:

if          3.2 mg of sodium ions are found in 1 mL of blood serum

then    3100 mg of sodium ions are found in X mL of blood serum

X = (1 × 3100) / 3.2 = 968.75 mL

Knowing that the blood serum contains 3.5 mg/mL of chlorine ions (Cl⁻) we devise the following reasoning:

if          3.5 mg of chlorine ions are found in 1 mL of blood serum

then    3100 mg of chlorine ions are found in X mL of blood serum

X = (1 × 3100) / 3.5 = 885.71 mL

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).