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In a 2 step synthesis where the 1st reaction has a 55% yield and the 2nd reaction has a 24% yield, determine the overall percent yield ?

At a certain temperature and pressure 0.70 Litres of Hydrogen reacts with 0.70 Litres of Iodine.,determine what volume of HI, will be produced at the same temperature and pressure, If all the H2 and I2 are consumed?

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