5. What is the wavelength, in nm, of light with an energy content of 700 kJ/mol

Question

5. What is the wavelength, in nm, of light with an energy content of 700 kJ/mol of ph A.2.83 nm C.0.700 nm D.283 nm 6. Which one of the following scts of quantum numbers would not be allowed? A.n-4,1-2, ml- B.n-3,1-1, ml- Cn-5.1 0, ml-0 D.n-2,1-2, ml- 7. Lithium acetate solution (30.0 mL, 0.10 M) and lead(ll) nitrate solution (15.0 ml., 0.1 M) are combined in a flask, what is the theoretical yield of the precipitate formed? A. 15.0 g B.0.488 g C.0.00 g D.0.207 g 8. A 20.00mL stock solution of NaCI (1.00 M) was diluted to 500.0 mL. An aliquot of this intermediate solution was used to make a final solution (1.00 L, 0.0062 M). How much of the intermediate solution was used to make the final solution? A.155 mL B.6.45 mL C.0.155 mL. D.12.4 mL 9. A 45.0 L tank contains a mixture of O; and N2 gases. The molar fraction of O2 is 0.664 and has a partial pressure of 500 mm Hg. What volume does Nz occupy in the tank? A.29.9 L B.0.336 L C.45.0 L D.15.1 L 10.How many electrons can occupy the highest energy subshell when n-62 (hint: start by determining the possible values of D A.22 B. 18 ?. 14 D.10 11.The correct condensed electron configuration for the Ze"2 ion is: A.[Kr]5s 4d B. [Kr] C.[Kr] 4d2 D.[Kr] 5s g electron configuration is a violation of which rule: 1s 2s 2p 3s 3p'4s-3d 4p'ss A.Hund's rule B.No violation: It is a valid electronic configuration C.Aufbau process D.Pauli exclusion principle

Explanation / Answer

5)

Given:

Energy of 1 mol = 7*10^2 KJ/mol

= 7*10^5 J/mol

Find energy of 1 photon first

Energy of 1 photon = energy of 1 mol/Avogadro's number

= 7*10^5/(6.022*10^23)

= 1.162*10^-18 J

This is energy of 1 photon

use:

E = h*c/lambda

1.162*10^-18J =(6.626*10^-34 J.s)*(3.0*10^8 m/s)/lambda

lambda = 1.71*10^-7 m

lambda = 171 nm

Answer: 171 nm

6)

lets verify for set (4,2,0)

This is valid

lets verify for set (3,1,-1)

This is valid

lets verify for set (5,0,0)

This is valid

lets verify for set (2,2,1)

l must be less than n

Here value of n is 2

But value of l is 2

so, l can't be 2

Hence, this is not valid

Answer: D

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