Question

Use the accepted value for the ideal gas constant (0.08314 L*bar/mol*K) to determine the percentage error in your experimental value.

% error= /(experimental value - accepted value)/accepted value/* 100%

Given that:

Mg(s)+ 2Hcl(aq)----> MgCl2(aq) + H2(g)

Mass of Mg = 0.0872 g

Final burette reading= 89.47 Ml

Atmospheric pressure= 99.1 kpa

Temperature of trapped gas= 21.6 ℃

Difference in solution levels inside and outside burette = 49 mm H2O.

The experimental value is the last question average trial R = 0.08435 L*Bar/mol*K

and the accepted value is given in the question =0.08314 L*bar/mol*K.

Finally I got the answer 1.45% percent discrepency. Is this answer reasonable?

Answer 1

Accounting for experimental uncertainties, error percent upto 8% is acceptable. In this case as it is just 1.45%, result is reasonable.