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Chapter 3: Q20P (page 131)
Calculate each of the following:
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Concentrated sulfuric acid (18.3 M) has a density of 1.84 g/mL. (a) How many moles of H2SO4 are in each milliliter of solution? (b) What is the mass % of H2SO4 in the solution?
What mass % of ammonium sulfate, ammonium hydrogen phosphate, and potassium chloride would you use to prepare 10/10/10 plant fertilizer (see Problem 3.140)?
Ethanol (CH3CH2OH), the intoxicant in alcoholic beverages, is also used to make other organic compounds. In concentrated sulfuric acid, ethanol forms diethyl ether and water:
In a side reaction, some ethanol forms ethylene and water:
(a) If 50.0 g of ethanol yields 35.9 g of diethyl ether, what is the percent yield of diethyl ether? (b) During the process, 45.0% of the ethanol that did not produce diethyl ether reacts by the side reaction. What mass of ethylene is produced?
Hydrogen gas has been suggested as a clean fuel because it produces only water vapour when it burns.Ifthe reaction has a 98.8% yield, what mass of hydrogen forms 105 kg of water?
Find the empirical formula of the following compounds:
(a) 0.039 mol of iron atoms combined with 0.052 mol of oxygen atoms
(b) 0.903 g of phosphorus combined with 6.99 g of bromine
(c) A hydrocarbon with 79.9 mass % carbon
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