Chemistry, 12.03.2020 05:31 marelinatalia2000

Butadiene, C4H6, dimerizes to C8H12 with a rate law rate = k[C4H6]2 where k = 0.84 L/(mol·min). What will be the concentration of C4H6 after 180 min if its initial concentration is 0.025 M?

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Answer from: jjsavage06

Answer : The concentration of C₄H₆ after 180 min is, 0.0052 M

Explanation :

The integrated rate law equation for second order reaction follows:

$k=\frac{1}{t}\left (\frac{1}{[A]}-\frac{1}{[A]_o}\right)$

where,

k = rate constant = 0.84L/(mol.min)

t = time taken = 180 min

[A] = concentration of substance after time 't' = ?

[A]_o = Initial concentration = 0.025 M

Now put all the given values in above equation, we get:

$0.84=\frac{1}{180}\left (\frac{1}{[A]}-\frac{1}{(0.025)}\right)$

[A]=0.0052M

Hence, the concentration of C₄H₆ after 180 min is, 0.0052 M

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

"among the transition metal elements, manganese and zinc have a slight lowering of electronegativities. the reason behind this is that the nuclear charges of these elements are slightly weaker than the other transition metal elements due to the way their valence electrons are filled up. both manganese and zinc have their valence electrons filled up to the 4th shell with 1 pair of electrons (4s2) completely occupying it. although the electrons in the 3rd shell (3d) are yet to be paired since the outer most shell is filled up, the ability of the nucleus to attract electrons is lessened. hence, the electronegativity (or the ability to attract electrons) is lessened."

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Butadiene, C4H6, dimerizes to C8H12 with a rate law rate = k[C4H6]2 where k = 0.84 L/(mol·min). What...

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