39) Consider one molecule or formula unit of the following compounds. Which one
ID: 904338 • Letter: 3
Question
39) Consider one molecule or formula unit of the following compounds. Which one has the most oxygens (either oxygen atoms or oxide ions)? 40) Given that the cation can have either a positive two or positive four charge, which formula below is correct for the compound plumbic chloride? 41) How many metalloids are found on the periodic table? 42) What is the mass, in amu, of one atom of Cr? 43) Consider one formula unit or molecule of the following compounds. Which one has the least number of total atoms or ions? 44) Which of the following statements is true about anions? 45) A nonpolar molecule cannot contain any polar bonds. . 46) What is the mass, in grams, of one atom of Cs?Explanation / Answer
39. Ans: c ...[ Aluminium sulphate has 12 O atoms: Al2(SO)4
trinitrogen octoxide: N3O8
Nickel permanganate: Ni(MnO4)2
Lithium Phosphate: Li3PO4
Palladium chlorate: Pd(ClO3)2]
40. Ans: c ....[ Lead(II) chloride (plumbous chloride), mineral name: cotunnite.
Lead(IV) chloride (plumbic chloride)]
41. Ans: a .....[ The metalloids; boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), polonium (Po) and astatine (At)]
42. Mass of one atom of Cs: 132.9 amu
43. Ans: b....[ a. SnCl4
b. CuCl
c. CaBr2
d. Fe2O3
e. NO2 ]
44. Ans: d
45. Ans : b ...[e.g., CO2]
46. Molar mass = 132.9 g/mol
Mass of one atom = 132.9/avogadro no
=132.9/6.023*1023
=2.2*1022 g
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