Physics

Physics

Problem

In an experiment studying the reaction 2 SO2+O2→2 SO32\,\text{SO}_2+\text{O}_2 \rightarrow 2\,\text{SO}_3, the concentration of SO2\text{SO}_2 is measured as 0.500 M (±0.005 M)0.500\,\text{M}\,(\pm0.005\,\text{M}) at t=0t=0 and 0.445 M (±0.005 M)0.445\,\text{M}\,(\pm0.005\,\text{M}) at t=60 st=60\,\text{s}. Assuming the absolute uncertainties add when subtracting the two readings, which of the following gives the concentration of SO3\text{SO}_3 formed during the 60 s interval together with its propagated absolute uncertainty? a) 0.055 M (±0.007 M)0.055\,\text{M}\,(\pm0.007\,\text{M}) b) 0.110 M (±0.010 M)0.110\,\text{M}\,(\pm0.010\,\text{M}) c) 0.055 M (±0.010 M)0.055\,\text{M}\,(\pm0.010\,\text{M}) d) 0.055 M (±0.005 M)0.055\,\text{M}\,(\pm0.005\,\text{M})

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