Calculate the mass percentage of cobalt in Co3(PO3)2.
1 Calculate the mass percentage of cobalt in Co3(PO3)2.
a. 55.6 percent
b. 52.7 percent
c. 18.5 percent
d. 49.7 percent
2 A close chemical relative of the banned insecticide DDT is methoxychlor (C16H15Cl3O2). Methoxychlor is currently used as a home insecticide. Calculate the mass percent of oxygen in methoxychlor.
a. 10.3 percent
b. 55.0 percent
c. 9.26 percent
d. 76.8 percent
3 Convert 1.24 x 1024 molecules AgCH3COO (MW = 167 g/mol) to grams AgCH3COO.
a. 4.47 x 1045 g
b. 1.25 x 1050 g
c. 1000 g
d. 344 g
4 Convert 0.261 moles AsCl5 (MW = 253 g/mol) to grams AsCl5.
a. 1.03 x 10-3 g
b. 66 g
c. 6.60 x 104 g
d. 6.60 x 10-2 g
5 Convert 42.7 grams Al(OH)3 (MW = 78 g/mol) to moles Al(OH)3.
a. 3.33 x 103 mol
b. .547 mol
c. .605 mol
d. 2.57 x 1025 mol
6 Convert 14.2 grams Pb(NO3)2 (MW = 331 g/mol) to molecules Pb(NO3)2.
a. 2.58 x 1022 molecules
b. 7.12 x 10-26 molecules
c. 2.85 molecules
d. 7.81 x 1021 molecules
7 Convert 3.94 x 1022 molecules KAl(SO4)2 (MW = 258 g/mol) to moles KAl(SO4)2.
a. 2.37 x 1046 mol
b. .191 mol
c. 6.54 x 10-2 mol
d. 6.54 x 1021 mol
8 Convert 2.58 x 1027 molecules CH3COOH (MW = 60 g/mol) to grams CH3COOH.
a. 2.59 x 1049 g
b. 7.49 x 105 g
c. 2.57 x 105 g
d. 71.4 g
9 Find the molarity of a solution prepared by dissolving 43.8 g NaOH (MW = 40 g/mol) in 220 cm3 of solution.
a. 7.96 M
b. 5.49 M
c. 4.98 x 10-3 M
d. 4.98 M
10 Determine the mass of AgNO3 (MW = 170g/mol) required to dissolve in 400 mL solution in order to prepare a solution which is .14 M AgNO3.
a. 9.52 x 103 g
b. 27.9 g
c. 9.52 g
d. 59.5 g
11 Find the molarity of a solution prepared by dissolving 120 g CaCl2 (MW = 111 g/mol) in 450 cm3 of solution.
a. .24 M
b. 2.4 M
c. 24 M
d. 2.4 x 10-3 M
12 Determine the mass of RbCN required to prepare a 500 mL solution which is .12 M RbCN (MW = 112 g/mol).
a. 6.72 g
b. 11.8 g
c. 67.2 g
d. 6.72 x 103 g
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