The last one guys this is worht 50 point

How many miles of calcium oxide will be produced when 1.6 miles of iron (iii) oxide react with calcium phosphate

What causes most sediment to wash or fall into a river

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