What is the concentration of H2O2 in a solution that is
30.0% by mass hydrogen peroxide and has a density of
1.11 g cm-3?
(A) 9.79 M
(B) 12.6 M
(C) 18.5 M
(D) 32.6 M
6. A 5.00 g mixture of potassium sulfide and potassium
chloride contains 2.80 g potassium. What percentage by
mass of the mixture is potassium sulfide?
(A) 13.8%
(B) 19.2%
(C) 44.0%
(D) 96.1%
7. Which salt dissolves in water to give a pink solution?
(A) Co(CH:COO)2
(B) CuSOA
(C) Fe(N03)3
(D) ZnCh
Answers: 3
Chemistry, 21.06.2019 22:30
1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 โ 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl โ 3. combine magnesium metal and hydrochloric acid solution. mg + hcl โ 4. electrolysis (splitting) of water. h2o โ 5. burning magnesium. mg + o2 โ
Answers: 3
Chemistry, 22.06.2019 09:00
An excess of lithium oxide undergoes a synthesis reaction with water to produce lithium hydroxide li2o+h2oโ2lioh if 1.05 g of water reacted, what is the theoretical yield of lithium hydroxide? a) 5.83 x 10โ2 g lioh b) 1.17 x 10โ1 g lioh c) 2.79 x 100 g lioh d) 1.40 x 100 g lioh
Answers: 1
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