Chemistry, 21.07.2019 18:30 issagirl05

Find the longest wavelengths of light that can cleave the bonds in elemental nitrogen, oxygen, and fluorine. the average bond energy of n―n bond is 945 kj/mol, oxygen is 498 kj/mol, and f―f is 159 kj/mol. give your answers in scientific notation.

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Answer from: maddiecrouch21

Explanation:

Longest wavelengths of light that can cleave the bonds in elemental nitrogen

Energy to cleave 1 mol N-N bond = 945 kJ/mol = 945000 J/mol

1 mol= $6.022\times 10^{23}$

Energy to break 1 N-N bond = $\frac{945000 J/mol}{6.022\times 10^{23} mol^{-1}}=1.56\times 10^{-18} J$

$E=\frac{hc}{\lambda }$

$\lambda =\frac{6.626\times 10^{-34}J s\times 3\times 10^{8} m/s}{1.56\times 10^{-18} J}=12.74\times 10^{-8} m=127.4 nm$

Longest wavelengths of light that can cleave the bonds in elemental nitrogen is 127.4 nm.

Similarly

For oxygen:

Energy to cleave 1 mol O-O bond = 498 kJ/mol = 498000 J/mol

Energy to break 1 O-O bond = $\frac{498000 J/mol}{6.022\times 10^{23} mol^{-1}}=8.26\times 10^{-19} J$

$E=\frac{hc}{\lambda }$

$\lambda =\frac{6.626\times 10^{-34}J s\times 3\times 10^{8} m/s}{8.26\times 10^{-19} J}=2.406\times 10^{-7}m=240.6 nm$

Longest wavelengths of light that can cleave the bonds in elemental oxygen is 240.6 nm.

For fluorine

Energy to cleave 1 mol F-Fbond = 159 kJ/mol = 159000 J/mol

Energy to break 1 F-F bond = $\frac{159000 J/mol}{6.022\times 10^{23} mol^{-1}}=2.64\times 10^{-19} J$

$E=\frac{hc}{\lambda }$

$\lambda =\frac{6.626\times 10^{-34}J s\times 3\times 10^{8} m/s}{2.64\times 10^{-19} J}=7.529\times 10^{-7}m=752.9 nm$

Longest wavelengths of light that can cleave the bonds in elemental fluorine is 752.9 nm.

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

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5 m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.

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Find the longest wavelengths of light that can cleave the bonds in elemental nitrogen, oxygen, and f...