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- Question. Determination of percent water (%H₂O) in hydrated FeSO4nH₂O is demonstrated in General Chemistry Laboratory (I), Chem. 105. The following table contains the results collected from the students groups. 1 2 3 4 5 6 (a) Calculate the average number of water molecules (b) %H₂O in each sample. 3.38 3.47 3.35 3.40 3.44 3.41 1.4 1.35 1.35 1.44 1.49 1.39 Mass of water (g) Moles of water Moles FeSO4 11= Moles H₂O Mole FeSO Average n % water in hydrated salt (wt/wt) Hint: Atomic mass: Fe = 56 g/mol; O = 16 g/mol; H = 1.0 g/mol; S = 32 g/mol.One hundred milliliters (100 mL) of a hydrocarbon (density = 0.660 g/mL) have undergone combustion to give CO2 and H2O. The molar masses, %yield and actual masses of isolated CO, and H20 are given below: Combustion Actual yield(g) Molar Mass Yield Product (g/mol) (%) H,0 18.02 76.47 73.88 CO2 44.01 86.77 175.49Vinegar contains ~5 wt% acetic acid. How many grams of vinegar are required to react with 5g of NaHCO3? The density of vinegar is close to 1.0 g/mL. How many mL of vinegar are required to react with 5g of NaHCO3? The reaction of vinegar and sodium bicarbonate is given by the reaction NaHCO3 + CH3COOH → Na+ + CO2 + H2O + CH3COO-
- 3.A core sample is saturated with an oil (po = 35°API), gas and water. The initial weight of the sample is 224.14 g. After the gas is displaced by water (pw = 1 g/cm'), the weight is increased to 225.90 g. The sample is the placed in a Soxhlet distillation apparatus, and 4.4 cm' water is extracted. After drying the core sample, the weight is now 209.75 g. The sample bulk volume, 95 cm3 is measured in a mercury pycnometer. Find the porosity, water saturation, oil saturation, gas saturation and lithology of the core sample.1. 250.0 g each of toluene (CoHsCH:) and benzene (CsHs) are mixed together. Answer the following questions. C&H6 C6HSCH3 Compound M (g/mol) Kr (°C/m) | TP (°C) | Kb(C/m) 5.12 7.27 78.108 93.142 5.55 -95.0 2.53 3.29 To (°C) 81.1 110.7 (a) In this solution, which is the solute and which is the solvent? (b) What is the freezing point of this solution, in °C? (c) What is the boiling point of this solution, in °C? (d) Calculate the osmotic pressure of this solution in kPa. Assume that the masses are additive and the density of the final solution at 25°C is 0.867 g/mL.a.) C+ 2H2 = CH4 From the equations: 1. С + О23D СО2 AH = -393.51 kJ 2. H2 + % O2 = H20 AH = -285.83 kJ 3. CH4 + 202 = CO2 +H2O AH = -890.37 kJ b.) 2N203 = 2N2 + 302 From the equations: 1. N203= NO + NO2 AH = 39.7 kJ 2. ½ N2 + ½ O2 = NO AH = 90.4 kJ 3. ½ N2 + O2 = NO2 AH = 33.8 kJ %3D
- Stoichiometry and balanced equations make it possible to use one piece of information to calculate another. There are countless ways stoichiometry can be used in chemistry and everyday life. Try and see if you can use what you learned to solve the following problems. a equations not olid 2) ation 1C must moles . alow. CH4(9)+UZ\9/ A 0.777g sample of an organic 5) compound is burned completely. It produces 1.42g CO2 and 0.388g H2O. Knowing that all the carbon and hydrogen atoms in CO2 and H2O came from the 0.777g sample, what is the empirical formula of the organic compound?1) O3 Ph 2) Zn, H20 3) NaOH, H2O heat (dehydration) 1) (excess) KMNO4, CH3 NaOH, H20, heat 9. 2) H2O, H3O*, (excess) 3) SOCI2 (excess) ČH(CH3)2 4) Et,NH (excess) 10. 1) CH3COOH 2) NaOH, H2O, heat CO2H 1) Br2, P; 2) H20 11. 3) NH3 (excess)Page < 2 of 2 ZOOM + 7. Write balanced chemical eqess | esc | to exitTO Screen ctions. a. production of ammonia, NH3(g), by combining N2(g) and H2(g) b. production of methanol, CH3OH(1), by combining H2(g) and CO(g) c. production of sulfuric acid by combining sulfur, oxygen, and water 8. Diborane and related compounds were proposed as rocket fuels in the 1950s. A representative reaction for this class of molecules is that of B2H6 and O2 to form B2O3 and H2O. Write the balanced chemical equation for this process. 9. Silicon nitride, Si3N4, is used as a reinforcing fiber in construction materials. It can be synthesized from silicon tetrachloride and ammonia. The other product is ammonium chloride. Write the balanced chemical reaction for this process. 10. Classify the following compounds as electrolytes or nonelectrolytes: a. potassium chloride, KCl b. hydrogen peroxide, H2O2 c. methane, CH4 d. barium nitrate, Ba(NO3)2
- 13. Given 10g of MgC12 and 16g of AGNO3 and an actual yield of 1.099g of AgCl. How much excess reagent is USED up in the reaction? Rxn: _MgCI2 + _A9NO3 -> _AgCI + _Mg(NO3)2 0.13 g 4.63 g 5.13 g 4.49 g 2.51 gK2Cr,O7, H2SO4, distill or PCC, CH,Cl2, 25 °C O. H. Ince tv FEB 21 MacBook ACalculation of AH; of Magnesium Oxide Mg + 2 HCI MgCl2 * Hz2 AH, = kJ/mole MgCl2 +H2O > Mgo + 2 HCI -AH2 = kJ/mole He + 를 O2 + H2O AH3 = - 286 kJ/mole net: Mg + 을 O2- MgO 사Hnet = kJ/mole The literature value for the AHf of magnesium oxide is -602 kJ/mole.