Chemistry, 31.08.2019 02:30 10040816

How many molecules of n2 gas can be present in a 2.5 l flask at 50c and 650 mmhg?

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First step is to change temperature and pressure into SI units:
50 degree celcius = 50 + 273 = 323 degree kelvin
650 mmHg = 650/760 = 0.855 atm

Second step is to calculate the number of moles of N2 that can be found under the mentioned conditions using the rule:
PV = nRT where:
P is the pressure, V is the volume, n is the number of moles, R is the gas constant (= 0.08206) and T is the temperature.
Substituting in the equation we get:
0.855 x 2.5 = n x 0.08206 x 323
n = 0.0806 moles

Third step is to get the number of molecules in 0.0806 moles by multiplying the number of moles by Avogadro's number:
number of molecules = 0.0806 x 6.02 x 10^23 = 0.485212 x 10^23 molecule

Answer from: Quest

i think the answer is c hope i'm right

Answer from: Quest

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).

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