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- Prepared 8 M of HCL in 500 ml, that density is 1.19 g/cm3 and percentage w/w is 37 %? * O The volume needed is 327.06 ml. O The volume needed is 250.08 ml. O The volume needed is 205.50 ml.ALEKS - Megan Boy... Classes | Pivot Inter... ta The Expert TA | Hu... PDFescape O STOICHIOMETRY Interconverting number of atoms and mass of compound Calculate the number of vanadium atoms in a 90.0 g sample of vanadium(V) oxide (V,0,). Be sure your answer has a unit symbol if necessary, and round it to 3 significant digits. x10 Check7. 22 This question is about several salts. (a) A hydrated salt, compound A, is analysed and has the following percentage composition by mass: Cr, 19.51%; CI, 39.96%; H, 4.51%; O, 36.02%. Calculate the formula of compound A, showing clearly the water of crystallisation. Show your working. formula of compound A = (b) A student carries out an experiment to determine the amount of water of crystallisation in the formula of another hydrated salt. The student intends to remove the water by heating the hydrated salt. A diagram of the apparatus used by the student is shown below. crucible pipeclay triangie The student adds the hydrated salt to the crucible and weighs the crucible and contents. The student heats the crucible and contents and allows them to cool. The student weighs the crucible and residue. The student's results are shown below. 16,84 Mass of crucible + hydrated salt/g 16.26 Mass of crucible + residue after heating/g
- i OWLV2 | On x O Significant x 4. Access Den x G Google * Settings My Home nment/takeCovalentActivity.do?locator3Dassignment-take [Review Topics] [References] Use the References to access important values if needed for this question. A dime has a mass of 2.30 x 10¬3 kilograms and a volume of 0.390 milliliters. a. Using unit analysis, calculate the density of the dime in units of grams/milliliter. Use one of the following to set up the conversion factor. 1 kg=1000 g 1000 mL=1 L 100 cm=1 m 1000 mg=1 g 1 mL=1 cm³ 1000 mm=1m 2.30 x 10 kg (number)(unit) g/mL 0.390 mL (number)(unit) b. Based on your calculation will the dime float or sink in water? Submit Answer Retry Entire Group 9 more group attempts remainingDATA: weight of the crucible + lid (Worucibletlid) =30.4265 weight of the crucible + lid + magnesium (Worucible-tlid+Mg) =30.6831 weight of the product + crucible + id (Werucible-tid+Mg 0) =30.7168 mass of the product (mMgo) = ? CALCULATIONS: Mass of magnesium: mMg = Mass of oxygen: mo = Number of moles of Mg: PMg = Number of moles of O: no = Mole ratio of Mg to O in the compound: rMg / no = Empirical (simplest) formula of the compound: Molecular formula of the compound (Note that the compound is an ionic compound) |/1wdGaF3fc41TY-3NU4JhvIQJLK2kFekLX/edit minutes ago IUA 三 ==,E 三E|X 20 2 | E 3 LI 4 IT3 E OI I 7 + EXPERIMENT Percent vield Due after completing the lab. Answer in the space provided. 1. A student reacted 0.500 g of Pb(NO.)2 with 0.750 g of KI according to the reaction, Pb(NO.b (aq) + 2 KI (aq)- → Pbb (s) +2 KNO: (aq) How many moles of Pb(NO.)2 were used? mol of Pb(NO) b) How many moles of KI were used? mol of KI c) How many moles of PbL would form, based on mol of Pbb the moles of Pb(N0) used? d) How many moles of Pbl would form, based on mol of Pbl the moles of KI used? e) Which is the limiting reactant? What is the theoretical yiekd of PbL in grams? 主 g of PbL g) If the student obtained 0.583 grams of PbL product after collecting it by fihration and dry ing it, what was the percent yield of Pbl obtained? 2. Diborane, B H, can be produced by the following reaction: NaBH (aq) H 50 (a) = H (g) = Na SO (aql= BH(B) What is the maximum quantity, in grams, of B H that can be prepared…
- .Ash content is - 29 A - Ash = residue after combustion. O B - Ash = residue after cooling. O The unit measuring of moisture - 30 is A-mm. O B-%. O C-gm. O Proximate analysis of coal - 31 A - Determines only fixed carbon, volatile O matter, moisture and ash B - Determines only fixed carbon. O"Analytical data are never more reliable than the sampling technique". Explain this statement.42.How many of the following should be included in a good hypothesis? (i) A prediction of the results of the experiment (ii) A step-by-step walkthrough of how to do the experiment with specific references to amounts of reactants, glassware used, and other experimental details (iii) A summation of the data collected after doing the experiment, with comments on accuracy and precision if possible. (iv) A detailed list of chemicals that will be used (v) Waste disposal procedures (vi) A brief scientific explanation of the predicted results. Said another way, the hypothesis should include a scientific explanation of why the predicted results are expected. A. 1 B. 2 C. 3 D. 4 E. 5
- Suppose that in a gravimetric analysis, you forget to dry the filter crucibles before collecting precipitate. After filtering the product, you dry the product and crucible thoroughly before weighing them. Is the apparent mass of product always high or always low? Is the error in mass systematic or random?2. Give the answer with correct sig.figs.: 332.57 +24.668 x 2.38 =1. a. Calculate the mass of BaSO4 required to make 50.00 mL of a 0.1500 M solution. b. Calculate the absolute uncertainty in the molar mass of BaSO4. c. Calculate the absolute uncertainty in the concentration, assuming that the balance is calibrated and precise to ±0.1 mg and that the volumetric flask is calibrated and precise to 0.05 mL.