In: Chemistry
An evaluation of R was performed, following the procedure
described in this module. The barometric pressure was 736 torr, the
temperature was 295 K and the volume of hydrogen gas collected was
35.6 mL. The calculated value of R was 82.1 mL atm K.
1) How many grams of magnesium metal were used?
2) If the vapor pressure of water had not been taken into account,
what would have been the calculated value of R?
3) If the syringe volume had been incorrectly read, giving a
calculated system volume of 25.6 mL, what would have been the
percent error in the calculated value of R?
1. We know that the ideal gas equation is written as PV=nRT
Now apply
Now we know the mass of given metal having
Now
Hence the 0.0336 gm available in Mg metal.
Answer for question number 1.