After performing Part A of the experiment, a student obtained the following concentrations for sodium hydroxide. Calculate the average concentration. Report your answer with four places after the decimal. Trial 1 Trial 2 Trial 3 Trial 4 Trial 5 Trial 6 0.989 0.975 0.976 1.081 1.062 0.949

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Lab Data Reevaluate your calculations. Collected Volume sodium carbonate (mL) 99.0 Molarity sodium carbonate (M) 0.10 Volume calcium chloride (mL) 100.0 Molarity calcium chloride (M) 0.10 Observations The substance turns from clear liquid to a cloudy white substance. Mass filter paper (g) 0.27 Mass filter paper + precipitate (g) 1.14 Calculated Observed mass calcium 0.87 carbonate (g) MY NOTES Identify limiting reactant Sodium carbonate Expected mass calcium carbonate (g) Percent yield (%) How to calculate theoretical yield and percent yield e Type here to search 近

Ex. 110 - Calculating Mass of 3 attempts left Check my work What mass of oxygen is needed to react with 1.79 gal of methanol according to the balanced equation below? (1.00 gal = 3.79 L, and the density of methanol is 0.793 g/mL.) 2 CH3OH() + 3 02g) – 2 CO2g) + 4 H2O(g) If appropriate, express your answer in scientific notion. (Click on the answer box to show the pallet.) < Prev 3 of 5 ***** ****

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Construct the expression for Kc for the following reaction. 1 3NO(g) = N20(g) + NO2(g) Construct the expression for Kc for the following reaction. 2 X 4HCI(aq) + O2(g) = 2H20(1) + 2C12(g) > Construct the expression for Kc for the following reaction. 3 CH4(g) + 2H2S(g) = CS2(g) + 4H2(g) Construct the expression for Kc for the following reaction. 4 X 2Cu*(aq) + Zn(s) = 2Cu(s) + Zn²*(aq) >

Data obtained: Chips # of extractions Chips' weight (g) Fat weight (g) Regular  3 20.043 6.745   3 20.187 6.438   3 20.198 7.451 Low fat  3 19.456 3.982   3 20.072 4.547   3 20.192 4.589   Mass percent is a method of expressing the concentration of a substance in a mixture or element in a compound. It is calculated as the mass of the component divided by the total mass of the mixture and then multiplied by 100 to get the percent. The formula is: mass % of component= (mass of component / total mass) x 100%   1) Reproduce the following table, and use the data to determine the mass % of fat in the chips for each trial. 2) Show one example calculation. Chips Trial % by mass of fat Regular 1     2     3   Lowfat 1     2     3

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Q) A student misreads the directions and adds 4.0 g of benzoic acid instead of 0.4 g. What do you expect to happen? Would the experiment still be valid? Explain your reasoning.     Pure Lauric Acid Lauric Acid + 0.4 g Benzoic Acid Lauric Acid + 0.5 g Benzoic Acid Mass of Lauric Acid   3.03g 3.00g 3.00g Mass of Benzoic Acid   0 g 0.40g 0.50g Freezing Point   43’C 39’C 38’C Freezing Point Depression *   4’C 5’C Molality of Benzoic Acid in Lauric Acid*   1.026 mol/kg 1.282 mol/kg Moles of Benzoic Acid *   0.003 moles 0.004 moles Experimental Molar Mass of Benzoic Acid *   133.3g/mol 125 g/mol Average Molar Mass *   129.15g/mol   Percent Error *   5.75%

The following volumes of 0.000300 M SCN are diluted to 15.00 mL. Determine the concentration of SCN in each sample after dilution. These values will be used during the experiment. To enter exponential values, use the format 1.0e-5. Sample 0.000300 M SCN (mL) [SCN'] (M) 1 1.50 3.50 7.00 4 10.00 3.