Crime scene investigators keep a wide variety of compounds on hand to with identifying unknown substances they find in the course of their duties. one such investigator, while reorganizing their shelves, has mixed up several small vials and is unsure about the identity of a certain powder. elemental analysis of the compound reveals that it is 63.57% carbon, 6.000% hydrogen, 9.267% nitrogen, 21.17% oxygen by mass. which of the following compounds could the powder be?

The question is incomplete, here is the complete question:

Crime scene investigators keep a wide variety of compounds on hand to help with identifying unknown substances they find in the course of their duties.  One such investigator, while reorganizing their shelves, has mixed up several small vials and is unsure about the identity of a certain powder.  Elemental analysis of the compound reveals that it is 63.57% carbon, 6.000% hydrogen, 9.267% nitrogen, 21.17% oxygen by mass. Which of the following compounds could the powder be?  

a.) = 3,4-methylenedioxymethamphetamine (MDMA), illicit drug

b.) = hexamethylene triperoxide diamine (HMTD), commonly used explosive

c.) = heroin, illicit drug

d.) = acetaminophen, analgesic

e.) = 2,4,6-trinitrotoluene (TNT), common used explosive

f.) = morphine, analgesic

g.) = methamphetamine, stimulant

h.) = caffeine, stimulant

The powder could be acetaminophen, analgesic  having chemical formula

Explanation:

We are given:

Percentage of C = 63.57 %

Percentage of H = 6.000 %

Percentage of N = 9.267 %

Percentage of O = 21.17 %

Let the mass of compound be 100 g. So, percentages given are taken as mass.

Mass of C = 63.57 g

Mass of H = 6.000 g

Mass of N = 9.267 g

Mass of O = 21.17 g

To formulate the empirical formula, we need to follow some steps:

Moles of Carbon =

Moles of Hydrogen =

Moles of Nitrogen =

Moles of Oxygen =

For the mole ratio, we divide each value of the moles by the smallest number of moles calculated which is 0.662 moles.

For Carbon =

For Hydrogen =

For Nitrogen =

For Oxygen =

The ratio of C : H : N : O = 8 : 9 : 1 : 2

The empirical formula for the given compound is

Hence, the powder could be acetaminophen, analgesic  having chemical formula

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).

weight of any object is given by

w = m*g

where m is mass of the object and g is the acceleration due to gravity.

for earth the value of g is 9.8 m/s^2 so

w=117.6 n m=12 g=?

117.6=12g => g=9.8 m/s^2

which is the force of gravity on earth.