A gas has a volume of 4

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1. A gas has a volume of 4.00 L at 0.0 °C. What will be its temperature if the volume changes to 10.0 L at constant pressure?
2. How many grams of Oxygen gas are present in a 500. mL container at a temperature of 952 °C and pressure of 2.5x10^−7 mmHg?
3. An unknown gas sample weighing 7.90 g occupies a volume of 900. mL at a pressure of 0.980 atm and a temperature of 25 ?C. Calculate the molar mass of the unknown gas.