Determination of the Universal Gas Constant Postlab 1. An evaluation of Rwas performed using the procedures outlined in this exercise, The barometric pressure was 735 torr and the temperature was 21.5 "C. The volume of H2(g) collected was 32.7 mL. The calculated value of Rwas 0.0817 L-atm/mol-K. a. How many grams of Mg metal were used in this determination? 0.0316 b. If the correction for the vapor pressure of water had not been performed, what would be the calculated value of R? 70.361 Incorrect c. If the syringe volume had been incorrectly read, resulting in a calculated H, volume of 30.6 ml, what would be the percent error in the calculated value of Rwith respect to the originally calculated value (0.0817 L-atm/mol-K)? 6.4 %

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.