If you were to compare the mass of the products and reactants in a reaction, you would find that the mass of the products is always greater the mass of the reactants is always greater the mass of the products is equal to the mass of the reactants the mass of the products may be greater or less than the mass of the reactants

Before it was launched, a helium-filled balloon had a pressure of 201 kpa at a temperature of 27°c. at an altitude of 15,000 m, the pressure had decreased to 2.5 kpa and the temperature had dropped to -14 °c. the volume of the balloon increased to 59.3 m3. what is the original volume of the balloon? 13 m3 0.85 m3 0.077 m3 1.17 m3