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- The fundamental difference between gravimetric and volumetric analysis: a gravimetric analysis involves a mass measurement as the determining measurement, while a volumetric analysis involves a volume measurement as the determining measurement, true or false?A physical property that can be described numerically as the grams of a substance that will dissolve in 100 g of water or other solvent.Mass of Empty Beaker is 141.2g, Beaker + Water is 388.3g, mass of water is 247.1g, volume of water is 0.2471mL, calculate volume H2=Volume displaced water
- In chemistry laboratories, it is faster and more convenient to measure out liquids by volume with pipets than by mass with an electronic balance. Therefore, when prepare solutions, volume ratio, instead of mass ratio is used sometimes. We can define a new term, volume % of a component, similar to mass % of a component. Let’s use a solution that is made of A and B as an example to explain this concept. If the volume % of A is 70%, the solution is made of 70 mL A with 30 mL B. A solution is prepared by mixing acetonitrile, CH3CN, and methanol, CH3OH, together. The volume percentage of acetonitrile is 35.84%. The density of acetonitrile is 0.786 g/mL and the density of methanol is 0.791 g/mL. Assume that the volume is additive. What is the mass percentage of acetonitrile in the solution? ____________% What is the molarity of the solution? __________ M What is the mole fraction of acetonitrile in the solution? ____________ What is the molality of the solution? __________ mDescribe how volumetric analysis methods are used in quantitative methods. Please provide at least two examples.Balance each of the following equations. Na(s)+Cl2(g)→NaCl(s) Mn(s)+O2(g)→Mn2O3(s) ZnO(s)⟶ΔZn(l)+O2(g) Express your answer as a chemical equation. Identify all of the phases in your answer
- What is the maximum mass of pure iron that could be extracted from 25.0g of hematite, iron ore with the chemical formula Fe2O3 ? Be sure your answer has a unit symbol, if necessary, and is rounded to the correct number of significant digits.Obtain values from the pictures found in the procedure to complete the data table below.Remember to include units!A. Data:1 Mass empty beaker2 Mass beaker + Na2CO33 Mass Na2CO3 used4 Mass graduated cylinder + HCl(aq)5 Mass empty graduated cylinder6 Mass HCl(aq) used7 Total mass before rxn: beaker + Na2CO3 + HCl(aq)8 Mass beaker + salt solution after reaction9 Mass of CO2 generated by the reaction10 Mass of beaker + NaCl (after drying)11 Mass of NaCl GeneratedTrue or False When a physical change occurs, a change in state occurs which indicates that a new substance has been formed.
- One student measured 25 cm3 of a 1.06 g / dm3 sodium carbonate solution. Calculate the mass of sodium carbonate in mg present in the measured volume.Nitrogen ΔHof (kJ/mol) ΔGof (kJ/mol) So (J/mol K) N2 (g) 0 0 191.6 N (g) 472.7 455.6 153.3 NH3 (g) -46.1 -16.5 192.5 NH3 (aq) -80.0 -27.0 111.0 NH4+ (aq) -132.0 -79.0 113.0 NO (g) 90.3 86.6 210.8 NOCl (g) 51.7 66.1 261.8 NO2 (g) 33.2 51.3 240.1 N2O (g) 82.1 104.2 219.9 N2O4 (g) 9.2 97.9 304.3 N2O4 (l) -20.0 97.0 209.0 N2O5 (s) -42.0 134.0 178.0 N2H4 (l) 50.6 149.3 121.2 N2H3CH3 (l) 54.0 180.0 166.0 HNO3 (aq) -207.4 -111.3 146.4 HNO3 (l) -174.1 -80.7 155.6 HNO3 (g) -135.1 -74.7 266.4 NH4ClO4 (s) -295.0 -89.0 186.0 NH4Cl (s) -314.4 -202.9 94.6 NH4Cl (aq) -299.7 -210.5 169.9 NH4NO3 (s) -365.6 -183.9 151.1 NH4NO3 (aq) -339.9 -190.6 259.8 Oxygen ΔHof (kJ/mol) ΔGof (kJ/mol) So (J/mol K) O2 (g) 0 0 205.1 O (g) 249.2 231.7 161.1 O3 (g)…What are the possible errors in using gravimetric method to determine the mass of total solids in water?
