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How many grams of Oxygen gas are required  if It is desired to inflate a baggie with  842 milliliters volume by filling it with O2 gas  at 1.21 atm pressure and a 306 K.temperature ?

when 45% aqueous calcium chloride has density = 1.10 g/ml, formula weight of calcium chloride= 110 g.mole then calculate the concentration of solution?

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