discribe how to prepare this solutions show all work and calcualtion? a) 50mL of
ID: 595656 • Letter: D
Question
discribe how to prepare this solutions show all work and calcualtion? a) 50mL of asolution containing 0.15M malonic acid [CH2(COOH)2 plus 0.02 manganese sulfate [ MnSO4] b) 100 mL of 0.08M sulfuric acid [H2SO4] from 18 M concnentrated sulfuric acid stock solution c)50mL of 0.2M potasium iodate [KIO3] dissolved in the 0.08M sulfuric acid that you prepared abave d)25mL of 3.6M hydrogen perioxide [H2SO4] from 30%(w/w) stock H2o2 solution (p=1.11g/ml) e) 50ml of a 3% ( w/v) soluble starch solution in water molecular weights of some compounds are malonic acid= 104.06 g/mol manganese sulfate=169.01g/mol potassium idate= 214 g/mol hydrogen peroixde= 34.01 g/molExplanation / Answer
60. 4Li(s) + O2(g) >>>>>>>>>>> 2Li2O(s) moles O2 required = (84 grams Li) * (1 mol Li / 6.941 grams Li) * (1 mol O2 / 4 mol Li) = 3.026 moles O2 required. PV = nRT, P = 1 atm, V = ?, n = 3.026 moles, R = 0.0821 L*atm/mol*K, T = 273 K (1 atm)*(V) = (3.026 moles O2) * (0.0821 L*atm/mol*K) * (273 K) V = 67.82 Liters is the answer. -------------------------------------- 61. M1 * V1 = M2 * V2 (9.0 M) * (V1) = (1.0 M) * (2.25 L) V1 = 0.25 Liters To prepare the solution, get the 0.25 Liter, 9.00 M stock solution, and add (2.25 L - 0.25 L) = 2.00 L of water to the stock solution to achieve the desired laboratory solution of 2.25 L at 1.0 M. ------------------------------------ 62. density of a gas = PM / RT, P = pressure, M = molar mass of gas, R = gas constant, T = temperature in Kelvin d = (PM) / (RT) d = ((1.00 atm) * (32 grams/mol)) / ((0.0821 L*atm/mol*K) * (273 K)) d = 1.428 grams/Liter is the answer.
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