Chemistry, 10.07.2019 21:00 xaniawashington

Nicotine, a component of tobacco, is composed of c, h, and n. a 2.625-mg sample of nicotine was combusted, producing 7.1210 mg of co2 and 2.042 mg of h2o. what is the empirical formula for nicotine?

Answers: 1

Show answers

Answers

Answer from: kayloveatae1234

The mass sample of nicotine combusted = 2.625 mg (given)

Mass of CO_2 produced = 7.1210 mg (given)

Mass of H_2O produced = 2.042 mg (given)

Molar mass of CO_2 = 44 g/mol

Molar mass of H_2O = 18 g/mol

Percentage of Carbon = $\frac{12 g}{44 g/mol}\times \frac{7.120 mg of CO_2}{2.625 mg sample}\times 100 = 74.04$ %

Percentage of hydrogen = $\frac{2 g}{18 g/mol}\times \frac{2.04 mg of H_2O}{2.625 mg sample}\times 100 = 8.62$ %

Now, for percentage of nitrogen = 100 - (74.04+8.62) = 17.34 %

Calculating the moles of each element:

$Number of moles = \frac{given mass}{Molar mass}$

For

$\frac{74.04 g}{12 g/mol} = 6.17 mol$

For

$\frac{8.62 g}{1 g/mol} = 8.62 mol$

For

$\frac{17.34 g}{14 g/mol} = 1.24 mol$

Dividing with the smallest mole value to calculate the molar ratio of each element:

$C_{\frac{6.17}{1.24}} = C_{4.9} = C_5$

$H_{\frac{8.62}{1.24}} = H_{6.9} = H_7$

$N_{\frac{1.24}{1.24}} = N_1$

Hence, the empirical formula for nicotine is C_5H_7N .

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

in scientific notation, the value of the speed of light in a vacuum

will be written as 2.995 * 10^8. when this value is represented in the form of

a * 10^b, then, a = 2.995 and b = 8.

the value of the speed of light in a vacuum given above can also be rounded up to approximately 300000000. in this case, the scientific notation will be written as 3 *10^8.

Another question on Chemistry

Chemistry, 22.06.2019 12:20

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.

Answers: 1

Answer

Chemistry, 22.06.2019 23:00

What is the number of neutrons in an atom with atomic mass of 35

Answers: 2

Answer

Chemistry, 23.06.2019 01:30

At a certain temperature the rate of this reaction is first order in hi with a rate constant of : 0.0632s2hig=h2g+i2g suppose a vessel contains hi at a concentration of 1.28m . calculate how long it takes for the concentration of hi to decrease to 17.0% of its initial value. you may assume no other reaction is important. round your answer to 2 significant digits.

Answers: 1

Answer

Chemistry, 23.06.2019 06:30

Which of the following steps is not likely to take place during cellular respiration? (5 points) select one: a. oxygen combines with carbon of simple sugar. b. energy molecule transfers energy to cells. c. simple sugar breaks down. d. energy is used up.

Answers: 1

Answer

You know the right answer?

Nicotine, a component of tobacco, is composed of c, h, and n. a 2.625-mg sample of nicotine was comb...

Questions