At a certain temperature the rate of this reaction is second order in SO3 w/ rate constant of ·0.0151M−1s−1. 2SO3g→ 2SO2

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At a certain temperature the rate of this reaction is secondorder in SO3 w/ rate constantof ·0.0151M−1s−1.
2SO3g→ 2SO2g+ O2g
So, SO3 at a concentrationof 0.930M. Calculate the concentrationof SO3 in the vessel 720.seconds later.
_______ M
At a certain temperature this reaction follows first-orderkinetics with a rate constant of 0.00131s−1
2H3PO4aq→ P2O5aq + 3H2Oaq
H3PO4 at a concentration of 0.980M. Calculate theconcentration of H3PO4 in thevessel 630. seconds later.
_______M