EVALUATION OF GAS LAW CONSTANT HELLLPPP !?

Cindy Walsh

New member
An evaluation of R was performed. 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 mol^-1.

a.How many grams of magnesiun metal were used?
b.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
(I keep getting a negative answer,is that right?)

Any help you can give is greatly appreciated !
 
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