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Chapter 4 (397919)
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Chemical Equations and Stoichiometry
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Chemical Equations and Stoichiometry
1. KT6 4.P.006. [489847] Show Details
Balance the following equations and name each reactant and product. (Use the lowest possible coefficients.) 2. KT6 4.P.010. [489839] Show Details
The balanced equation for a reaction in the process of reducing iron ore to the metal is shown below.
Fe2O3(s) + 3 CO(g) 2 Fe(s) + 3 CO2(g) (a) What is the maximum mass of iron, in grams, that can be obtained from 495 g of iron(III) oxide? (b) What mass of CO is required to react with 308 g of Fe2O3? 3. KT6 4.P.026. [489881] Show Details
Aspirin, C6H4(OCOCH3)CO2H, is produced by the reaction of salicylic acid, C6H4(OH)CO2H, and acetic anhydride (CH3CO)2)O.
http://www.webassign.net/v4cgibatista@yale/assignments/preview.tpl C6H4(OCOCH3)CO2H(s) + (CH3CO)2)O(l) C6H4(OCOCH3)CO2H(s) + C6H4(OH)CO2H(l) If you mix 100. g of each of the reactants, what is the maximum mass of aspirin that can be obtained? 4. KT6 4.P.031. [467436] Show Details
A mixture of CuSO4 and CuSO4 5 H2O has a mass of 1.235 g, but after heating to drive off all the water, the mass is only 0.822 g. What is the mass percent of CuSO4 5 H2O in the mixture? 5. KT6 4.P.044. [489880] Show Details
To find the formula of a compound composed of iron and carbon monoxide, Fex(CO)y, the compound is burned in pure oxygento give Fe2O3 and CO2. If you burn 1.959 g of Fex(CO)y and obtain 0.799 g of Fe2O3and 2.200 g of CO2, what is the empirical formula of Fex(CO)y? (Type your answer using the format CO2 forCO2.) 6. KT6 4.P.045. [467603] Show Details
Balance the following equations. (Use the lowest possible coefficients.) (a) the synthesis of urea, a common fertilizer (b) reactions used to make uranium(VI) fluoride for the enrichment of natural uranium (c) The reaction to make titanium(IV) chloride, which is then converted to titanium metal. 7. KT6 4.P.050. [489843] Show Details
Your body deals with excess nitrogen by excreting it in the form of urea, NH2CONH2.The reaction producingit is the combination of arginine (C6H14N4O2) with water to give urea and ornithine (C5H12N2O2).
If you excrete 65 mg of urea, what quantity of arginine must have been used? What mass of ornithine must have been produced? 8. KT6 4.P.068. [486058] Show Details
http://www.webassign.net/v4cgibatista@yale/assignments/preview.tpl Thioridazine, C21H26N2S2, is a pharmaceutical used to regulate dopamine. (Dopamine, a neurotransmitter, affects brain processes that control movement, emotional response, and ability to experience pleasure and pain.) A chemist can analyze a sample of the pharmaceutical for the thioridazine content by decomposing it to convert the sulfur in the compound to sulfate ion. This is then "trapped" as water-insoluble barium sulfate (see Figure 4.8). 4 (aq, from thioridazine) + BaCl2 Suppose a 6 tablet sample of the drug yielded 0.397 g of BaSO4. What is the thioridazine content, in milligrams, of each tablet? 9. KT6 4.P.014. [486064] Show Details
The formation of water-insoluble silver chloride is useful in the analysis of chloride-containing substances.
Consider the following unbalanced equation.
BaCl2(aq) + AgNO3(aq) AgCl(s) + Ba(NO3)2(aq) (a) Balance the equation. (Use the lowest possible coefficients.) (b) What mass AgNO3, in grams, is required for complete reaction with 0.142 g of BaCl2? 10. KT6 4.P.036. [486059] Show Details
The aluminum in a 0.750 g sample of an unknown material was precipitated as aluminum hydroxide, Al(OH)3, which was then converted to Al2O3 by heating strongly. If 0.154 g of Al2O3 is obtained from the 0.750 g sample, what is the mass percent of aluminum in the sample?

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