The Grass Doctor

Chemistry problems! i really need help!! =/ pleasssse?

so i have a chem paper due in a day and I dont get any of this! please please please help! best answer gets 10 points! thanks! 32.dentify each of the following compounds as a strong electrolyte, weak electrolyte, or nonelectrolyte. a. CH3OH (methanol) ____________________ b. CH3COOH ____________________ c. KNO3 ____________________ d. NH3 ____________________ e. NH4Cl ____________________ f. CaCO3 ____________________ 33.Combustion analysis of a 1.893 g sample of a compound produced 5.545 g of CO2 and 1.388 g H2O. The molar mass of the compound is 270.36 g/mol. If the compound contains carbon, hydrogen and oxygen only, determine the molecular formula of this compound. 34. A. What volume (in mL) of a 0.150 M HNO3 solution is required to completely react with 35.7 mL of a 0.108 M Na2CO3 solution according to the following balanced equation? Na2CO3(aq) + 2HNO3(aq) → 2NaNO3(aq) + CO2(g) + H2O(l) b.What mass (in grams) of CO2 is produced? 35.Consider the following reaction for the manufacture of urea (CH4N2O), a fertilizer; 2NH3(aq) + CO2(aq) → CH4N2O(aq) + H2O(l) When 136.4 kg of ammonia is allowed to react with 211.4 kg of carbon dioxide ,168.4 kg of urea is produced. Determine, a.The limiting reagent b.The theoretical yield of urea c.The percent yield of urea 36.Classify each of the following compounds as either soluble or insoluble, using the solubility rules; a. Zn(NO3¬)2 b. MgBr2 c. PbSO4 d. Cu(OH)2 e. (NH4)3PO4 f. CaCO3 g. AgCl h. Pb(C2H3O2)2 i. Al(OH)3 j. K2S 37.Complete and balance the following chemical equations; a. CrBr2(aq) + Na2CO3(aq) → b. NaOH(aq) + FeCl3(aq) → c. Na3PO4(aq) + NiCl2(aq) → d. NH4Cl(aq) + AgNO3(aq) → 38.Write complete and balanced equations for the reactions below: a.potassium carbonate and lead (II) nitrate b.copper (II) nitrate and magnesium sulfide c.chromium (III) nitrate and sodium phosphate d.sodium chloride and lead (II) acetate 39.Balance the following chemical equations. a. NaNO3  NaNO2 + O2 b. Sr(NO3)2 + Na3PO4  Sr3(PO4)2 + NaNO3 c. H2 + P4  H3P d. C4H10 + O2  CO2 + H2O e. C + Fe2O3  Fe + CO f. AlCl3 + O2 → Al(ClO3)3

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1. _____Answers do not like to do all your work. We are here to answer they ones you have worked on, but have not been able to solve. email me which "ONE" of these has given you the most trouble and I will answer it. Here's 33 and 35 that show different techniques: 33.Combustion analysis of a 1.893 g sample of a compound produced 5.545 g of CO2 and 1.388 g H2O. The molar mass of the compound is 270.36 g/mol. If the compound contains carbon, hydrogen and oxygen only, determine the molecular formula of this compound. Let UNITs guide you; always USE THEM in your calculation to prevent errors Firstly, the eqn: CxHyOz + wO2 -----> xCO2 + y/2 H2O ____________1.893 g__________5.545 g____1.388 g H2O moles C =5.545 g / MW CO2 g/mole = ?? ___g C in sample = moles C * 12.00 g/mole = ?? moles H2O = 1.388 g / MW H2O g/mole = ?? ___g H in sample = 2 * moles H2O * 1.008 g/mole = ?? -----g O in sample = (1.893g - g C - g H) = ?? moles O in sample = g O / 16.000 g/mole empirical F: CxHyOz :: C(moles C/moles O) H(moles H/molesO) O (1) # empirical F's in MW = MW / (empirical F wt) = 270.36 g/mole / (x*12.00 + y * 1.008 + z * 16.00) = ?? molecular formula = C #x H #y O#z Plug and SOLVE Basic mathematics is a prerequisite to chemistry – I just try to help you with the methodology of solving the problem. 35.Consider the following reaction for the manufacture of urea (CH4N2O), a fertilizer; 2NH3(aq) + CO2(aq) → H2N(C=O)NH2(aq) + H2O(l) When 136.4 kg of ammonia is allowed to react with 211.4 kg of carbon dioxide ,168.4 kg of urea is produced. Determine, a.The limiting reagent b.The theoretical yield of urea c.The percent yield of urea Let UNITs guide you; always USE THEM in your calculation to prevent errors The eqn: 2NH3(aq) + CO2(aq) → H2N(C=O)NH2(aq) + H2O(l) ________N-3______C+4_______N-2_C+2_N-2 (N->1e & C<-1e; so 2N/1C) (this to show how to do redox eqns) a) limiting reactant: ___kmoles NH3 = 136.4 kg / MW NH3 kg/kmole = ?? ___kmoles CO2 = 211.4 kg / MW CO2 kg/kmole = ?? required: 2 NH3 / 1 CO2; have kmoles NH3 / 1 kmole CO2 ___if have ration < 2 then NH3 limiting, otherwise CO2 b. theoretical yield of urea ___if NH3 limiting: (1 kmole urea / 2 kmole NH3) * moles NH3 * MW urea kg/kmole = ?? ___if CO2 limiting: (1 kmole urea / 1 kmole CO2) * moles CO2 * MW urea kg/kmole = ?? c: yield = 100 % * 168.4 kg of urea / theoretica kg of urea = ?? Plug and SOLVE Basic mathematics is a prerequisite to chemistry – I just try to help you with the methodology of solving the problem.