For the reaction 2Co2S3 (s) + 9O2 (g) → 2Co2O3 (s) + 6SO2 (g). Given: O2 gas has a volume of 42.9 L, pressure of 905 torr, and temperature of 35 °C.
1) (4 points) What in the amount of O2 gas?
2) (4 points) What is the amount of Co2S3 (s) required to react with the given amount of O2 gas?

3) (4 points) What mass of Co2S3 (s) is required to react with the given amount of O2 gas

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2poclâ‚(g) ⇜ 2 pclâ‚(g) + oâ‚‚(g) â†gâ° = (2 mol)î”gfâ°(pclâ‚) – (2 mol)î”gfâ°(poclâ‚) = (2 mol)(–270 –(–502) kj/mol) â†gâ° = + 464 kj = â†hⰠ– tî”sâ° î”sâ° = 179 j/k ⇒ â†hâ° = â†gâ° + (298 k)(179 j/k) = –411 kj assuming that î”hâ° and î”sâ° do not depend on temperature, the temperature at which â†gâ° = 0 is where t = â†hâ°/î”sâ° = (–411 kj)/(0.179 j/k) = 2294 k. at that temp. keq = 1 for the reaction.

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