True or False: A mixture is a mixture in which one substance dissolves in another.
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True or False: A mixture is a mixture in which one substance dissolves in another.
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- 29. A solution containing 90% by volume of alcohol (in water) runs at 1 gal/min into a 100-gal tank of pure water where it is continually mixed. The mixture is withdrawn at the rate of 1 gal/min. When will it start coming out 50% alcohol?Question 30 How many grams are in 5.60 x 1024 molecules of NaCI? PreviousA1
- Ascorbic acid (vitamin C) is oxidized by iodine according to the equation below: 1 mol ascorbic acid + 1 mol iodine1 mol dehydroascorbic acid + 2 mol hydroiodic acid a) An iodine solution of unknown concentration is used to titrate 10.00 mL of 0.003013 M ascorbic acid. If 27.55 mL of iodine is required to reach the endpoint, what is the concentration of the iodine solution? Express as a decimal.QUESTION 7 (Start on a new page.) The airbags in motor vehicles contain the compound sodium azide (NaNs). When a car crashes into an object, the compound decomposes and the nitrogen inflates the airbag. The balanced equation for the reaction is as follows: NaN(s) → 2Na(s) + 3N2(g) In one such decomposition, 2,53 x 10° molecules of nitrogen are generated. Calculate the: 7.1 Number of moles of NaN(s) that decomposed 7.2 Volume of N2(g) produced Assume that the reaction occurs at standard pressure. QUESTION 8 (Start on a new page.) Aluminium sulphate is used as a coagulant in water purification. It reacts with sodium hydroxide to form aluminium hydroxide which drags the impurities as it settles. The balanced equation for the reaction is: Al2(SO4)3(aq) + 6NaOH(aq) → 2Al(OH)3(s) + 3Na2SO4(aq) A chemist at a water purification plant adds 700 g of Al2(SO4)3 to a sample of water. 8.1 Calculate the maximum mass of Al(OH)3 that can be produced from this mass of Al2(SO4)3. (4) E [7] (5) The…