How many moles of a gas sample are in a 10.0 L container at 298 K and 203 kPa? Use the ideal gas law PV = nRT with R = 8.31 L-kPa/mol-K.

A. 1.22 moles
B. 0.60 moles
C. 1.66 moles
D. 0.82 moles

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.