Question

1.- In many engineering jobs it is common to use the British Btu thermal unit to express specific heat capacity. Using a dimensional analysis estimate the C value of the water in Btu / lb * ° f

2.- Represent the F atom by drawing all of its occupied orbitals (in outline mode)

3.- What is the wavelength that a photon requires so that when absorbed, the electron goes from n = 4 to n = 6, whose delta E = 7.6x10-20 J

4.- What is the maximum number of electrons that can occupy the level n = 5

(Image is for guidance in case symbols are confusing)

12. En muchos trabajos de ingeniería es común usar la unidad térmica británica Btu para expresar la capacidad calorifica especifica. Mediante un análisis Btu dimensional estime el valor de la Cs del agua en Ib. OF 13. Represente al átomo de F dibujando todos sus orbitales ocupados (en modo contorno). 14. ¿Cuál es la longitud de onda que requiere un fotón para que, al absorberse, el electrón pase de n=4 a n=6, cuya AE = 7,6-10-20 J? 15. ¿Cuál es el número máximo de electrones que pueden ocupar el nivel n=5?

Answer 1

1) specific heat capacity is defined as the quantity of heat energy (in Btu) required to rise the temperature of one pound of a material by one degree farenheit .

f - is? 252 2p5 IL IS (11 (1211/ 1 25 2p where 2- Wave % -'m ] length R- Rydberg constant rer 1.097 x 10 m 19 = 1.094x10272- +1.094x10* [us-] = 1.097 x 10 576 - 1.097 x 18 x 0.03472 0.0380g xio 3.809 x 105 mm hen 3 8.809810 0.262 536x10 mm 0 12

The specific heat of water is 1Btu/lb.⁰f . Or one Btu per pound per degree farenheit.

2) four F atom there are seven electrons. Which occupy in the orbitals s and p as follows

1S² 2S² 2P⁵ which is also represented as in picture

3)wavelength can be calculated from the equation

4)the maximum number of electon that can occupie a given energy level is given by

Maximum no. Of electron =2n² where n is energy level

Here n=5 then

maximum no. Of electrons = 2×5² = 50 e-