How many significant figures should the heat of reaction, qr…

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 heat of reaction, qrxn, of magnesium oxide with…

What is the heat of reaction, qrxn, of magnesium oxide with aqueous HCl, in J, 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

In an experiment that reacts a trivalent metal with HCl to g…

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 [AcOH] in vinegar in M if you have performed one…

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%