Choose the sentence with correct comma usage.

What’s an end mark

Did he stop at the redlight or not

What city will host the Super Bowl in 2028?

In an experiment that reacts a trivalent metal with HCl to generate molecular hydrogen, the following data comes about.  How many significant figures should the MW of the metal in g/mol have?Mass of unknown trivalent metal sample, Munk:0.032 gVolume of trapped air (initial), Vi:1.6 mLVolume of air after experiment (final), Vf:44.0 mLRoom temperature, T:21.4 °CPartial pressure of H2, PH2:748.4  torrGas constant, R:0.0821 L•atm•(mol•K)-11 atm:760 torr

What is the equilibrium constant Kc for [Fe(NCS)]2+ formation from the reaction between hydrated ferric ion (Fe3+) and thiocyanate ion, (NCS)−,  in ratio of molar concentrations?Starting volume of Fe(NO3)3 before mixing in reaction7.27 mLConcentration of Fe(NO3)3 before mixing in reaction0.00469 MStarting volume of (NCS)- before mixing in reaction5.20 mLConcentration of (NCS)- before mixing in reaction0.00566 MConcentration of [Fe(NCS)]2+ as determined from a calibration plot and absorbance after equilibrating reaction0.000753 M

How many significant figures should the heat of reaction, qrxn, of magnesium oxide with aqueous HCl, in J have, given the following data?Mass of MgO0.457 gSpecific Heat of HCl soln (water)4.184 J/g-degChange in temperature, ΔT4.2 degVolume of HCl added104.2 mLConcentration of HCl added0.994 MMW, MgO40.304 g/molDensity of HCl solution1.016 g/mLΔH1 (experimentally determined)-467.8 kJ/molΔHf,water-285.8 kJ/mol

What is the [AcOH] in vinegar in M if you have performed one titration of vinegar with NaOH, involving the following data?Concentration of oxalic acid (OA):0.793 MVolume of OA titrated:10.0 mLVolume of NaOH to titrate OA:10.41 mLConcentration of NaOH on bottle:3.021 MVinegar density:1.005 g /mLVolume of NaOH to titrate vinegar (AcOH):5.25 mLVolume of vinegar titrated:9.96 mLAcOH MW:60.05 g/molWt% of AcOH in vinegar from bottle:5.0%

When reacting a zinc pellet with iodine in water (in the hood), all of the iodine is consumed. Based on this reaction set-up and the starting data below, how many moles of I2 were consumed?  Report your answer to 5 decimal places.  Do not report units.Mass, Porcelain Evaporating Dish (PED):259.439 gMass, PED+starting Zn granules:264.917 gMass, vial+I2 crystals:282.614 gMass, vial:282.007 gMass, PED+ending Zn granules:264.748 gMW I2:253.808 g/molMW Zn:65.38 g/mol

Given the following data, what fomula best represents the way to calculate the theoretical mass of KTOF3 produced, in g, from the reaction of potassium oxalate with ferric (III) chloride?Potassium oxalate (KOx), initially weighed out:3.204 gVolume of water used to dissolve KOx:10.0 mLMW KOx:184.23 g/molFerric Chloride dispensed:3.91 mLFerric Chloride molarity:2.24 MMW KTOF3:491.25 g/molMass of KTOF3 isolated:1.343 g