A solution of F is prepared by dissolving 0.0954 ± 0.0005 g NaF (molar mass 41.989 ± 0.001 g/mol) in 164.00 ± 0.06 mL of water. Calculate the concentration of F in solution and its absolute uncertainty. Significant figures are graded for this problem. To avoid rounding errors, do not round your answers until the very end of your calculations. [F-] = M ± I+ M
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- 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.Straight-chain, saturated carboxylic acids, a class of hydrocarbons, has the general formula CnH2n+1COOH where n is an integer than ranges from 1 to 18. What would be the %C by mass if n = 1 ? Atomic weights: C=12.01, H=1.01, O=15.99. Input values only with 2 decimal places. Do not include the units.The combustion of ammonia in the presence of excess oxygen yields NO2 and H2O: 4 NH3 (g) + 7 02 (g) → 4 NO2 (g) + 6 H2O (g) The combustion of 218 g of ammonia consumes g of oxygen. Atomic weights: N=14.01, H=1.01, O=15.99. Input values only with 2 decimal places.
- (Incorrect) An impure sample of hydrocarbon having a total mass of 41.0 g undergoes combustion analysis to generate 82.6 g CO₂(g) and 16.9 g H₂O(g). Assuming that the impurities do not contain carbon or hydrogen, what percentage of the initial sample is the pure hydrocarbon? Provide the numerical value of your response in decimal notation rounded to 3 significant figures. You answered: 4.58 The correct answer is: 59.5%1. Fish liver oil is a good source of vitamin A, whose concentration is measured spectrometrically at a wavelength of 329 nm. (a) When 0.1232 g of fish-liver oil is dissolved in 500. mL ofsolvent, the absorbance is 0.724 units. When 1.67×10−3 g ofvitamin A is dissolved in 250. mL of solvent, the absorbanceis 1.018 units. Calculate the vitamin A concentration in thefish-liver oil. (Please type answer no write by hend).Straight-chain, saturated carboxylic acids, a class of hydrocarbons, has the general formula CnH2n+¡COOH where n is an integer than ranges from 1 to 18. What would be the %C by mass if n = 12? Atomic weights: C=12.01, H=1.01, 0=15.99. Input values only with 2 decimal places.
- Determine the elemental percentages of all elements in C7H12CuO2. Enter your answer to two decimal places of precision, but do not include the percentage sign in your answer. C = H = Cu = O= % % % %320.4 grams of isomaltitol, C12H24O11, was combusted in a furnace completely in an excess oxygen. The products of this reaction are liquid water and gaseous carbon dioxide. How much water (in kg) do you expect from this reaction assuming that all of the isomaltitol reacts? Enter your numeric answer in the units of kg. Do not enter the unit. Use enough significant digits to prevent rounding errors. Hint: balance the reaction first. Recall that 1 kg = 1000 g.1. The molecular formula for potassium hydrogen phthalate (abbreviated KHP) is C3H$O4K. What is the molar mass of KHP? Show all work with no rounding errors and have the final answer accurate to at least two decimal places.
- 7. 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/gStraight-chain, saturated carboxylic acids, a class of hydrocarbons, has the general formula CH20+1COOH where n is an integer than ranges from 1 to 18. What would be the %C by mass if n = 6 ? Atomic weights: C=12.01, H=1.01, O=15.99. Input values only with 2 decimal places. Do not include the units. Add your answerUse the meaning of the prefix "nano-" to select the value of "x" in this equation: 1 m = 1 x 10x nm . The value of " x " is (a) +9 (b) -6 (c) +6 (d) -9