Oxygen gas can be prepared by heating potassium chlorate: 2kclo3(s)2kcl(s) + 3o2(g) in one experiment, a sample of kclo3 reacts and the gas produced is collected by water displacement. the gas sample has a temperature of 24.00 °c, a volume of 564.0 ml, and a pressure of 754.0 mm hg.
calculate the amount (in moles) of oxygen gas produced in the reaction. the vapor pressure of water is 22.38 mm hg at 24.00 °c.

0.0222 mol

Explanation:

When a gas is collected by water displacement, the total pressure is equal to the pressure of the gas (in this case oxygen) and the pressure of the water vapor.

P = Pw + PO₂

PO₂ = P - Pw = 754.0 mmHg - 22.38 mmHg = 731.6 mmHg

We can find the moles of oxygen using the ideal gas equation.

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).