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If the mass of the products measured 120g what would the mass of the reactants a. 30g b. 60g c. 120g d. 240g

If i initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 k, and then i raise the pressure to 14 atm and increase the temperature to 300 k, what is the new volume of the gas?

What substance has a mass of 9.5g and volume of 2.1cm^3