1) (3pts) Identify the ions present in Na2SO4 a. Na*, S2, and O2 b. Na, s2, and
ID: 937479 • Letter: 1
Question
1) (3pts) Identify the ions present in Na2SO4 a. Na*, S2, and O2 b. Na, s2, and o2 c. Nat and SO4 d. Na, S2, and O e. Na and SO4 203 pts) which element is most likely to form a 2-ion? b. Mg c. d. Br 3) (3 pts) For a nonmetal in Group 16 of the periodic table, the most common monatomic ion will have a charge of b. 2 e. 2+ 4) (3 pts) C2H2F4 is the formula for two possible molecules. CaH Fs is an example of a(n) a. structural formula. b. empirical formula. c. condensed formula. d. space-filling model. e. molecular formula.Explanation / Answer
1) Ions in Na2SO4,
c. Na+ and SO4^2-
2) Element to form -2 ion,
e. S
3) For a non-metal in Group 16, most probable charge would be,
b. 2-
4) C2H2F4 has two structures, is an example of,
a. structural formula
Short answers
1) moles of S = g/molar mass = 63.7 g/32.065 g/mol = 1.99 mols
2) Formula of copper(II) chloride = CuCl2
3) molecules with mass percentage of atoms,
C = 47.35% ; moles of C = 47.35/12 = 4.0 mols
H = 10.60% ; moles of H = 10.60/1 = 10.60 mols
O = 42.05% ; moles of O = 42.05/16 = 2.63 mols
divide by smallest factor,
C = 4.0/2.63 = 1.5
H = 10.6/2.63 = 4
O = 2.63/2.63 = 1
Empirical formula = C3H8O2
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