(87.5−22.541)÷ 0.0058    Express your answer to the appropriate number of significant figures.

A solution of F− is prepared by dissolving 0.0944±0.0006 g NaF (molar mass = 41.989±0.001 g/mol) in 162.00±0.06 mL of water. Calculate the concentration of F− in solution and its absolute uncertainty. To avoid rounding errors, do not round your answers until the very end of your calculations.

A sodium chloride solution was prepared by dissolving 0.0998 \pm 0.0005 g NaCI (58.443 \pm 0.001 g/mol) in 100.00 \pm 0.08 mL of water. Calculate the concentration of NaCl in the solution and its absolute uncertainty. Report the concentrationwith the appropriate number of significant figures.

What answer should be reported, with the correct number of significant figures, for the following calculation? (249.362 + 41.0) / 63.498 O 4.57277 O 4.5728 O 4.573 O 4.57 O 4.6

A tablet of Mylanta antacid contains 0.300 g Mg(OH)2 and 0.200 g Al(OH)3. For the blanks in this question: Report here only your numerical answers (without units), if the value is less than zero as a decimal (not in scientific notation), to the correct number of significant figures. Mg(OH)2 (molar mass:  58.32 g/mole) Al(OH)3 (molar mass:  78.00 g/mole) How many moles Mg(OH)2 are present in the tablet?  How many moles of Al(OH)3 are present in the tablet?  How many moles of HCl are required to neutralize the Mg(OH)2 in the tablet?    Start this question by using your rounded answer from #1. How many moles of HCl are required to neutralize the Al(OH)3 in the tablet?    Start this question by using your rounded answer from #2. How many moles of HCl acid will be required to neutralize both the Mg(OH)2 and the Al(OH)3 in the tablet?    Use your rounded answers from #3 and #4 to answer this question. How many milliliters of 0.200 M HCl can be neutralized by one tablet?    Use your rounded…

(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%

You have a stock solution certified by a manufacturer to contain 245.0±0.2 ?g SO2−4/mL. You would like to dilute it by a factor of 100 to obtain 2.450 ?g/mL. Two possible methods of dilution are stated. For each method, calculate the resulting absolute uncertainty in concentration. Use the manufacturer's tolerances in the table for uncertainties.   Glassware Tolerance 1‑mL transfer pipet ±0.006 mL±0.006 mL 10‑mL transfer pipet ±0.02 mL±0.02 mL 100‑mL volumetric flask ±0.08 mL±0.08 mL Method A: Dilute 10.00 mL up to 100mL with a transfer pipet and volumetric flask. Then take 10.00 mL of the dilute solution and dilute it again to 100 mL.   absolute uncertainty: ±.-----?g/mL   Method B: Dilute 1.000 mL up to 100 mL with a transfer pipet and volumetric flask.   absolute uncertainty: ±------?g/mL

Methyl benzoate is an oily liquid with a boiling point of 199°C. What volume of methyl benzoate is needed to prepare 5.8 grams of benzoic acid? The density of methyl benzoate is 1.08 g·cm⁻³. Molar masses are given in Figure 4. [Give only the number without the unit. Give the answer in cubic centimetres and round to 1 decimal place. Use a decimal point.] * Your answer

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Use 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