17. Calculate the charge in Coulomb of 1 electron. A. 1.6890566 x 10\'16 c B. 1.

Question

17. Calculate the charge in Coulomb of 1 electron. A. 1.6890566 x 10'16 c B. 1.8967864 x 1013 c D. 2.5688868 x 10"C E 1.6021773 x 1019C c. 2.4686886 x 10-6 c 18. Calculate the change in energy expressed in eV for a change in mass equivalent to 1 mass unit u. A. 845678943.2 eV D. 931494460.3 ev E 834149446.3. ev B. 789789654.4. eV C 6549874564. ev 19. Calculate the amount of energy in kJ released during the decay of one mole of A. -6.4. kJ. B. 6.8. kJ. C. 5.1 J. D. 5.8kJ. E. -4.5. kJ 20. Consider the fusion reaction 22Hi-) tie. Calculate in kilojoules per gram of deuterium fused. A. -3.46 x 10 J B. 5.72 x 10 J C. 6.74 x 10 kJ. D. -4.65 x 109 kJ E. 5.76x 10 kJ

Explanation / Answer

17- An electron carries a negative charge. The unit of this negative charge is coloumb. It is a physics constant and has a constant value which is one electron charge= 1.6 x 10-19 Coloumb.

18- An atom contains protons, electrons and neutrons. The mass of the three entities are given in atomic mass unit.

1 a.m.u = 1/12 of mass of isotope of carbon (12)

Carbon 12 contains 6 protons and 6 neutrons and has 12 a.m.u.

Change in the mass equivalent to 1 Mass unit can be calculated by first calculating the 6 times mass of protons, neutrons and electrons and then substracting the mass of carbon 12 atom from it. This is required to calculate the binding energy which will require to split the atom into individual particles.

Mass of electon= 0.000548 u

Mass of proton= 1.007276 u

Mass of neutron= 1.008664 u

Mass of atom C-12 = 12.000 u

The energy obtained = 0.09891 u

The same energy for 12 Carbon = 0.098931* 931.5( mass of 1 u)= 92.15 MeV.

so option D is the change in energy.

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