In one experiment, 0.780 g Nb (s) was sealed in a 28.0 mL glass tube at 25°C under 6.33 atm of hydrogen gas, H2.

In one experiment, 0.780 g Nb (s) was sealed in a 28.0 mL glass tube at 25°C under 6.33 atm of hydrogen gas, H2. After reacting with the hydrogen for one week, all of the niobium had been converted to niobium hydride, NbH. Calculate the final pressure of hydrogen gas in the system at 25°C.

Gases

Step by Step Explanation Ethylene, C2H4, will react with hydrogen gas under appropriate conditions to form ethane, C2H6. A 10.0-liter vessel is charged with 1.5 atm of hydrogen and 1.0 atm of ethylene at 25°C. The reaction is allowed to proceed to completion. Determine the total pressure in the vessel at 25° at the completion of the reaction.

Gases

Step by Step explanation Ferrous oxalate, FeC2O4, will decompose on heating: FeC2O4 (s) ® FeO (s) + CO2 (g) + CO (g) A 1.25-gram sample of FeC2O4 is added to an evacuated 2.00-liter steel vessel. The vessel is heated to 400°C, at which point all the FeC2O4 is decomposed. Calculate the pressure inside the vessel at 400°

Gases

Potassium chlorate, KClO3, decomposes when heated: KClO3 (s) ® KCl (s) + 3/2 O2 (g) 1.00 gram of potassium chlorate is completely decomposed and the oxygen is collected over water at 25°C and 0.99 atm. Calculate the total volume of gas collected. (The vapor pressure of water at 25°C is 23.8 torr).

Design experiment to reduce Fe+3 to Fe+2

I just need some help to get started on designing an experiment for a quantitative colorimetric iron assay. We're allowed to use the followiing items: deionized water 0.02 M feCl3 1,10-phenantnthroline ferrozine filter paper test tubes and test tube racks volumetric flasks HCl NaOH digested soil samples undigested soil samples Are solutions with Fe+3 ions a different color than Fe+2 solutions? What colors are they? How can I figure out the molecular formulas of 1,10-phenanthroline & ferrozine? What does the soil add to the equation?