At 430ºC Keq = 0.064 for the reaction of rust with hydrogen gas. Given the [H2] = 0.45 M, [H2O] = 0.37 M, and
This question cannot be answered as posed because there are at least three possible reactions between Fe2O3 (hematite) and H2. Each of these reactions has a different expression for the equilibrium or activity product: hematite reduction to magnetite: Fe2O3 + 1/3 H2 = 2/3 Fe3O4 + 1/3 H2O K = [H2O]^(1/3)/[H2]^(1/3) hematite reduction of wustite: Fe2O3 + H2 = 2FeO + H2O K = [H2O]/[H2] hematite reduction to metallic iron: Fe2O3 + 3 H2 = 2 Fe + 3 H2O K = [H2O]^3/[H2]^3 All of these are a "reaction of 'rust' with hydrogen gas". Which does the question refer to? The problem is made even worse by the fact that any of these reactions can be multiplied through by a constant, which will result in a different equilibrium expression. I have written all these reactions using one mole of Fe2O3 reactant, but, for instance, I could have also written the first reaction as: 3Fe2O3 + H2 = 2Fe3O4 + H2O (i.e., the equation above multiplied by a factor of 3) for which the equilibrium constant expression would be: K = [H2O]/[H2] Unless your teacher or book specifies the exact reaction that corresponds to the value of Keq = 0.064, you cannot answer this question. -------------------------------------- Once you know the reaction, then you would plug in the values for [H2] and [H2O] to calculate the reaction product, Q. If Q > K, the reaction will run to the left to reach equilibrium. If Q < K, the reaction will run to the right to reach equilibrium. If Q = K, then the reaction is already at equilibrium.
How many hydrogen atoms are there in 3 moles of hydrogen gas?
First, stress those points that need to be noticed in your question: how many hydrogen atoms are there in 3 moles of hydrogen gas?This problem seems not difficult but it may be complex a little. Just because of its wordsIn Chemistry, you need to remember a constant named after a famous Chemist, Avogadro, which is 6.023 x 10^23Avogadro found that "there're always about 6.023 x 10^23 atoms/molecules in 1 mole of any substance"For example:There's 1 mole of iron (Fe), that means you have 6.023 x 10^23 atoms of iron nowThere's 1 mole of salt (NaCl, sodium chloride), that means you have 6.023 x 10^23 molecules of saltWhy?? Because chemicals which are forming from more than 2 atoms (in this case, Na and Cl) are called "molecule". Not a single atom as iron aboveTurn back to your problem, hydrogen gas has molecular formula is H2This means in 1 molecule of hydrogen gas, there're 2 atoms of hydrogenNow just calculate…Applying Avogadro constant, in 3 moles of hydrogen gas there're 3 x (6.023 x 10^23) = 1.8069 x 10^24 molecules of hydrogen → there're 2 x (1.8069 x 10^24) = 3.6138 x 10^24 atoms of hydrogen→ So, the final answer of your question is that there're 3.6138 x 10^24 atoms of hydrogen in 3 moles of hydrogen gas !
Kinetic Energy of Hydrogen and Oxygen Gas Conceptual Question?
By tne theorem of equipartition of energy, the average translational energy of all kinds of molecules is the same at thermal equilibrium (T = 50 degrees = 323.15 K). Therefore, the average square of the speeds for hydrogen and oxygen molecules are inversely proportional to their molecular masses. The squares of the speeds are thus in a 16 to 1 ratio and the speeds are in a 4 to 1 ratio. The rms speed of diatomic oxygen is 500 m/s. NOTE that the rms average of 1/2 m v^2 at temperature T is actually 3/2 k T. One mole of any perfect gas has a total translational kinetic energy of 3/2 RT = 4030.23 J (This is close enough to the number stated in the question.) As diatomic hydrogen has 2 degrees of rotational freedom in addition to the 3 degrees of translational freedom, a mole of the gas at temperature T stores an energy 5/2 RT (at least at temperatures that are low enough to make the addiotional degree of vibrational freedom inactive).
Determine volume of hydrogen.. chem question. please help.?
Mg + 2HCl → MgCl2 + H2 From the balanced equation above, determine the volume of hydrogen gas at standard temperature and pressure that can be produced from three moles of magnesium reacting with hydrochloric acid. i would really appreciate if you could help me out with this. im kinda confused. although, when i did it i got 67.2 L H(subscript)2 lol not sure how to do it exactly.. help?
A cylinder containing hydrogen gas physics question?
Assume ideal gas The number of moles in the cylinder compartment can be found from ideal gas law p·V = N·R·T => N = (p·V)/(R·T) The internal energy of an ideal gas is solely a function of temperature: dU = N·Cv·dT Hydrogen is an diatomic gas. The specific heat capacity of an ideal diatomic gas is: Cv = (5/2)·R Therefore the energy needed is: ΔU = N·Cv·ΔT = (p·V)/(R·T) · (5/2)·R · (T' - T) = (5/2) · (p·V/T) · (T' - T) = (5/2) · (10·101325Pa · 0.27m³ / 273K) · (25K) = 231.97kJ
Is it possible to use hydrogen gas as a fuel in cars and other vehicles used daily?
Interesting question.I hope I will be able to give you a clear picture through this answer from my experiences.So daily used cars now have Internal Combustion Engines producing the power and torque to run vehicles. Where we have petrol and diesel as a fuel for spark ignition (SI) and compresion ignition (CI) engines respectively under the hood.Now coming to hydrogen, yes hydrogen can be used in Internal Combustion Engines (ICE) instead of petrol and diesel with few modification in existing deaign. A lot of research at various automobile giants is under progress for this. A lot of money is invested to to commercialize the idea of using hydrogen as fuel in ICE.Now hydrogen can also be used as fuel for Fuel Cells. Fuel cell is a device which converts Chemical eneegy to Electrical energy throgh electochemistry. Fuel that is Hydrogen is supplied to anode and Oxygen i.e. air, supplied to cathode and through fuel oxudation and Oxygen reduction electricity is produced in fuel cells, giving away heat and water the only byproducts. This electicity can be used to run motors fitted in vehicles and practically a car can run on Hydrogen. There are couple of cars available from Honda, Toyota and Hyundai globally which run on this technology.However issues such as hydeogen infrastructure, safety are major concerns blocking this technology. For example if hydrogen is burning you can’t actually see its fire, untill you get burned yourself.Hope this helps !!Cheers ☺
Molar volume of a gas questions?
In setting up the experiment of a finding molar volume of hydrogen gas, a student noticed that a bubble of air leaked into the graduated cylinder when it was inverted in the water bath. What effect would this have on the measured volume of hydrogen gas? Would the calculated molar volume of hydrogen gas be too high or too low as a result of this error? Exlplain.
Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric aci?
Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc. Zn(s) + 2 HCl(aq) → ZnCl2(aq) + H2(g) Typically, the hydrogen gas is bubbled through water for collection and becomes saturated with water vapor. Suppose 248 mL of hydrogen gas is collected at 30.°C and has a total pressure of 1.036 atm by this process. a) What is the partial pressure of hydrogen gas in the sample? __atm b) How many grams of zinc must have reacted to produce this quantity of hydrogen? (The vapor pressure of water is 32 torr at 30°C.) __g