Match the correct choices with the given. For gravimetric analysis, use this data to answer the questions. Trial 1 0.6020 g 24.8405 g 24.8451 g 24.8422 g 24.8422 g Trial 3 0.5018 g 22.8169 g 22.8169 g Trial 2 0.5021 g Weight of Sample Weight of Crucible and Ba$O, 22.8165 g 22.8165 g Constant Weight of Crucible & Sample 24.8422 g 22.8165 g 22.8169 g

Subject: chemistry

How many formula units are in 30.912 g of potassium permanganate? Give answer to the correct number of significant figures.  If exponents are needed, use the format 1.23E+4.  Do not include unit or substance for this answer.

9.51 g mixture of metal hydrate BaCl2*2H2O with an unknown amount of KCl is heated to remove water from the sample in order to determine the percent mass of BaCl2*2H2O from the original mixture. Find the percent mass of BaCl2*2H2O from the original mixture if the sample has reduced mass of 9.14 g after heating.

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

When answering this problem, report the answer with the appropriate number of significant figures. Enter your answer USING scientific notation. When entering units, use proper abbreviated units with proper capitalization. In this experiment, a series of solutions are prepared by combining multiple components into a single container. One solution prepared contains 5.00 mL of 0.010 molar KI, 10.00 mL of 0.0010 molar Na2S2O3, 15.00 mL of water, 10.00 mL of 0.040 molar KBrO3, and 10.00 mL of 0.10 molar HCl.  What is the concentration of iodide ions in this solution? Answer: ____x10______units

Assume that your empty crucible weighs 15.98 g, and the crucible plus the sodium bicarbonate sample weighs 18.56 g. After the first heating, your crucible and contents weighs 17.51 g. After the second heating, your crucible and contents weighs 17.50 g. Answer the following questions based on this information.

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%

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What volume of water must be added to 32.7 mL of sulfuric acid solution in order to reduce its concentration to 1/10 its original concentration?  Provide answer in mL to 3 significant figures.