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if a sample of 3.16g at a pressure of 0.750 atm and temperature of 45 degree Celsius then calculate What is the molar mass of a gas if it occupies a volume of 2.05 litres?

Using a sample of ferrous ammonium sulfate hexahydrate of 0.5585 grams needs KMnO4 solution of 21.45 ml to reach a pink endpoint then calculate what will be tha molarity of the KMnO4 solution?

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