22. What changes occur to the atomic number and mass of a nucleus during each of

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22. What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: a particle is emitted a. The atomic number decreases by two and the mass number decrease by four b. The atomic number increases by one and the mass number remains unchanged c. The atomic number and mass number remain unchanged. d. The atomic number decreases by one and the mass number remains unchanged e. The atomic number decrease by one and the mass number remains unchanged.

23. . What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: radiation is emitted a. The atomic number decreases by two and the mass number decrease by four b. The atomic number increases by one and the mass number remains unchanged c. The atomic number and mass number remain unchanged. d. The atomic number decreases by one and the mass number remains unchanged e. The atomic number decrease by one and the mass number remains unchanged

24. What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: a positron is emitted a. The atomic number decreases by two and the mass number decrease by four b. The atomic number increases by one and the mass number remains unchanged c. The atomic number and mass number remain unchanged. d. The atomic number decreases by one and the mass number remains unchanged e. The atomic number decrease by one and the mass number remains unchanged

25. What changes occur to the atomic number and mass of a nucleus during each of the following decay scenarios: an electron is captured (a) The atomic number decreases by two and the mass number decreases by four. (b) The atomic number increases by one and the mass number remains unchanged. (c) The atomic number and mass number remain unchanged. (d) The atomic number decreases by one and mass number remains unchanged. (e) The atomic number decreases by one and the mass number remains unchanged.

26. 239Pa is a nuclear waste by product with a half – life of 24,000 y. What fraction of the 239Pu present today will be present in 1000y?

27. Calculate the molecular or formula mass for P4

28. Calculate the molecular or formula mass for H2O

29. Calculate the molecular or formula mass for Ca(NO3)2

30. Calculate the molecular or formula mass for CH3CO2H ( acetic acid)

31. Calculate the molecular or formula mass for C12H22O (sucrose, cane sugar)

32. Determine the mass in grams of 0.6000 mol of oxygen atoms ( grams x 1mole/(Mass of element)

33. Determine the mass in grams of 0.600 mol of oxygen molecules, O2 (grams x 1mole/mass of molecule)

34. Determine the mass I grams of 0.600 mol of ozone molecules, O3 (grams x 1mole/(mass of molecule)

35. Which type of radiation is most penetrating? A, alpha B. beta C. gamma D. they are equal

Explanation / Answer

Since it is a multi question i do answer for few questions only

27. Molar mass of P4 is 123.8950480 ± 0.0000080 g/mol

28. Molar mass of H2O is 18.01528 ± 0.00044 g/mol

88.8102 %

29. Molar mass of Ca(NO3)2 is 164.0878 g/mol

30. Molar mass of CH3CO2H is 60.0520 g/mol

31. Molar mass of C12H22O is 182.3025 g/mol

32. mass in grams of 0.6000 mol of oxygen atoms = 0.6 x 16 = 9.6 gm

33.  mass in grams of 0.600 mol of oxygen molecules =  0.6 x 32 = 19.2 gm

34. mass in grams of 0.600 mol of ozone molecules = 0.6 x 47.998 = 28.7988 gm

(Molar mass of O3 is 47.99820)

35.  Which type of radiation is most penetrating : Gamma rays are the most penetrating of the radiations. Gamma rays are highly energetic waves and are poor at ionising other atoms or molecules.

Symbol Element Atomic weight Atoms Mass percent H Hydrogen 1.00794 2 11.1898 % O Oxygen 15.9994 1

88.8102 %

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