12. The average atomic massofatomic chlorine is 35.45 amu. This makes sense, acc
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12. The average atomic massofatomic chlorine is 35.45 amu. This makes sense, according to the mass spectrum to the right, because (B) ue to its larger peal largest peak. the average mass is equal to the mass of the (D) ...the average mass is halfway between the two isotope masses. 17 13. How are the isotopes of Cl related to one another? (A) They have different atomic numbers but different numbers of electrons. (B) They have different atomic numbers but the same number of neutrons. (C) They have different atomic numbers but the same number of protons. mass amul (D) They have the same atomic number but different numbers of neutrons. (E) They have the same atomic number but different numbers of protons, 14. Pick the largest mass among the following options. (Assume that they are exact quantities. (A) 10-10 ng (B) 109 Aug (D) 103 dg 15. Consider the problem: "Measurements show that 1.0 gofiron atoms (Fe) contains 1.1x102 Fe atoms. Each hemoglobin molecule contains exactly 4 atoms. Ifan average adult body contains 4.9 g of Fe atoms, how many hemoglobin molecules are in 3 people?" Which of the following shows a correct setup to solve the problem? 4.9 g Fe atoms x (1.1x1022 Feat 10 Fe atoms (A) 1.1x1022 Fe atoms 49 Fe atoms 1.0 Fe atoms 1.1x1022 Fe atoms) 4 hemoglobir (D) 3 bodies x 4 Fe atoms (E) 3 bodies x Fe atoms 1.0 g Fe atomsExplanation / Answer
12. Option A and B you can discart them because even though 35 Cl has a large peak, it's not heavier than 37 Cl. The average mass it's calculated by taking the average of the mass of both isotopes. So option C is the correct one because a large peak indicates more common.
13. The atomic number indicates the number of protons, and when you substract it with the mass you'll get the neutrons. In these case both isotopes have the same atomic number so the number of protons is the same, but the number of neutrons will be different (35-17 = 18, 37-17 = 20), so the correct option would be D.
14. Let's convert all of these units to the same unit (in this case, all to grams):
A) 10-10 ng * 1x10-9 g/ng = 1x10-19 g
B) 10-9 ug * 1x10-6 g/ug = 1x10-15 g
C) 0.1 kg * 1x103 g/kg = 100 g
D) 103 dg * 1x10-1 g/dg = 100 g
Option C and D are the largest.
14. Option E is the correct option.
Hope this helps
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