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Chapter 4: Q66P (page 180)
Give the oxidation number of nitrogen in the following:
Answer: You need to provide the oxidation no of nitrogen for the given compounds
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Do either of the following reactions go to completion? If so, what factor(s) cause(s) each to do so?
When each of the following pairs of aqueous solutions is mixed, does a precipitation reaction occur? If so, write balanced molecular, total ionic, and net ionic equations:
(a) Sodium nitrate + copper(II) sulfate
(b) Ammonium bromide + silver nitrate
Thyroxine (C15H11I4NO4) is a hormone synthesized by the thyroid gland and used to control many metabolic functions in the body. A physiologist determines the mass percent of thyroxine in a thyroid extract by igniting 0.4332 g of extract with sodium carbonate, which converts the iodine to iodide. The iodide is dissolved in water, and bromine and hydrochloric acid are added, which convert the iodide to iodate.
(a) How many moles of iodate form per mole of thyroxine?
(b) Excess bromine is boiled off and more iodide is added, which reacts as shown in the following unbalancedequation:
How many moles of iodine are produced per mole of thyroxine?
(Hint:Be sure to balance the charges as well as the atoms.) What are the oxidizing and reducing agents in the reaction?
(c) The iodine reacts completely with 17.23 mL of 0.1000 Mthiosulfate as shown in the following unbalancedequation:
What is the mass percent of thyroxine in the thyroid extract?
How many total moles of ions are released when each of the following samples dissolves completely in water?
(a) 0.734 mol of
(b) 3.86 g of
(c) formula units of localid="1656604875395"Limestone (calcium carbonate) is insoluble in water but dissolves when a hydrochloric acid solution is added. Write balanced total ionic and net ionic equations, showing hydrochloric acid as it actually exists in water and the reaction as a proton-transfer process.
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