A 0.619 g0.619 g sample of cobalt, Co,Co, is added to 229 mL229 mL of 0.100 M H2SO40.100 M H2SO4 and reacts according to   Co(s)+H2SO4(aq)→CoSO4(aq)+H2(g) A volume of 135 mL135 mL of hydrogen is collected over water. The water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr and the temperature is 25 ∘C.25 ∘C. What is the percent yield of hydrogen for this reaction?

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