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- If 205 g of MgCl2 (FW 95.21 g/mol) is added to a solution containing 295 g of (NH4)3PO4 (FW 149.09 g/mol) what mass, in g, of Mg3 (PO4)2 (FW 262.86 g/mol) precipitate will be formed . The balanced equation is 3MgCL2 +2(NH4)3PO4=Mg3(po4)2+6NH4CL1) The fizz produced when an Alka-Seltzer tablet is dissolved in water is due to the reaction between NaHC03 and citric acid CO2(8) + H,0(1) + Na3CgH;O;(aq) NaHCO;(aq) + H;C,H;O;(aq) a) In a certain experiment 1.00 g of NaHCO3 and 1.00 g of citric acid are allowed to react. Which is the limiting reactant? b) How many grams of sodium citrate (the last compound in the equation) form? c) How many grams of the excess reactant remain after the limiting reactant is completely consumed? d) If 0.723 g of sodium citrate was obtained in this reaction, then what is the percentage yield?what mass of FeS is necessary to form 1.08 g Fe2O3 excess O2? 4FeS+7O2=2Fe2O3+4SO2
- 6. Some sulfuric acid is spilledon a lab bench. You can neutralizethe acid by sprinkling sodiumbicarbonate on it and then moppingup the resultant solution. The sodiumbicarbonate reacts with sulfuric acidas follows:2 NaHCO3(s) + H2SO4(aq)Na2SO4(aq) + 2H2O(l) + 2CO2(g)Sodium bicarbonate is added until thefizzing due to the formation of CO2(g)stops. If 27 mL of 6.0 M H2SO4 wasspilled, what is the minimum mass ofNaHCO3 that must be added to thespill to neutralize the acid?(b) 1. CH3CH₂COCI, AICI3 2. Br₂, CH3CO₂H 3. K+tBuO 4. OsO4 then NaHSO3 5. H₂CrO 4 *%85 l Sn [F ? ChemDoodleⓇ40:99 6. a. If 0.405 mol ethane (C2H6) and 29.4 g oxygen react, how many moles of water will be formed? 4 CO2(g) + 6 H2O(g) 2 C2H6(g) + 7 O2(g) b. The reaction above was found to proceed in 89.7% yield. What was the actual yield (in grams) of carbon dioxide isolated? O 2022 Cuesta College. All rights reserved 43 Handbook 1 , 0ɔ.2 g of HNO3 are isolated. Handbook 1 2022 Cuesta College. All rights reserved 42
- 5-) 1,200 grams of aluminum of an impure NH4AI(SO4)2 sample is converted into Al203 by precipitation with aqueous ammonia and heating. It seems that this comes to 0.1798g. Accordingly, determine the amount of a)% Al203 b)% Al in the initial sample.What weight Fe2O3 (FW = 159.69) can be obtained from 2.63 g of Fe3O4 (FW = 231.53) by gravimetric method *Kk.53. Write a balanced chemical equation and the net ionic equation for the process where aqueous calcium hydroxide reacts with dissolved magnesium chloride to yield solidmagnesium hydroxide and aqueous calcium chloride.
- From Part A: Mass of KxFe(C2O4)y · zH2O prepared : 5.600 g Mass of FeCl3 : 1.60 g From Part B: % Potassium in compound : 23.23 % % Iron (from ion exchange & titration vs. NaOH) : 8.25 % From Part C: % Oxlate : 56.78 % Calculate the following for C2O42-: g in 100 g sample mol in 100 g sample mol/mol Fe (3 sig figs) mol/mol Fe (whole number)I 11 Some lighters contain a hydrocarbon, a) Express the molar mass of an isomer in The percentage, by mass, of carbon in which is a mixture of isomers of general for- mula CnH2n+2, where n is to be determined. kitch The percentage, by _mass, of carbon these isomers is 82.8%. the Ass the r the terms of n. Cond b) Express the percentage, by mass, of car- bon in terms of n. Deduce the molecular formula of the considered isomer. c) Give their condensed structural formulas and their names. |14A mixture of hydrogen and 4.+1. 2HI