What would be the effect on the calculated ratio (mole of copper:mole of iron) if: (a)some iron had been spilt?

(b)The iron fillings were not 100% pure?

(c)Some copper had been spilt?

(d)The copper was not completely dry?​

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