iron reacts with oxygen and water to create rust and hydrogen gas as shown in the chemical equation. what mass of rust, to the nearest hundredth gram, is produced in this reaction?

The identities of substances are the same before and after which type of change

What is the chemical formula for the compound formed between sodium and flour one

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