Which expression best reflects the way to calculate the enthalpy of the reaction of MgO and HCl to form MgCl2 and H2O (ΔHrxn,MgO+HCl) in kJ/mol from the released heat of reaction, given the following data? Mass of MgO 0.511 g Specific Heat of HCl soln (water) 4.184 J/g-deg Change in temperature, ΔT 4.4 deg Volume of HCl added 101.2 mL Concentration of HCl added 0.997 M MW, MgO 40.304 g/mol Density of HCl solution 1.016 g/mL ΔH1 (experimentally determined) -466.8 kJ/mol ΔHf,water -285.8 kJ/mol

In an experiment that reacts a trivalent metal with HCl to generate molecular hydrogen, the following data comes about.  What is the MW of the metal in g/mol? Mass of unknown trivalent metal sample, Munk: 0.032 g Volume of trapped air (initial), Vi: 1.6 mL Volume of air after experiment (final), Vf: 44.0 mL Room temperature, T: 21.4 °C Partial pressure of H2, PH2: 748.4  torr Gas constant, R: 0.0821 L•atm•(mol•K)-1 1 atm: 760 torr

A shift in control results is a:

Explain the 41s Westgard QC rule.

A chemical solution of a known concentration that can be used as a reference or calibration substance is:

When you have a normal Gaussian distribution, the mean, median and mode are equal.

Which of the following values is altered by recent food ingestion?

What is the % CV for a set of data with a standard deviation of 0.22 and mean of 1.75?

Which of the following would be included in the analytical phase of a QA plan?

Explain the R4s Westgard QC rule.