chem

posted by .

Calculate the number of liters of hydrogen, measured at STP, that can be produced from the reaction of 0.155 mol of aluminum according to the following unbalanced chemical reaction equation.


i got .193 L of H2 but it was wrong. i only have one submition left!

  • chem -

    You didn't include the unbalanced equation. Is it something like
    2Al + 6HCl ==> 3H2 + 2AlCl3 or
    2Al + 3H2SO4 ==> 3H2 + Al2(SO4)3
    Actually, I think any reaction chosen will be a 3/2 ratio as see below.

    0.155 moles Al x (3 moles H2/2 moles Al) = 0.155 x (3/2) = 0.2325 moles H2.
    Since one mole occupies 22.4 L at STP so
    0.2325mol x 22.4 L/mol = ??

  • chem -

    2Al(s) + 2NaOH(aq) + 2H2O(l) 2NaAlO2(aq) + 3H2(g) (unbalanced)

    sorry i forgot. it was unbalanced but then i balance it

  • chem -

    So my answer didn't change because the ratio still is 3/2.
    0.155 moles Al x (3 moles H2/2 moles Al) x (22.4L H2/mol H2) = ??L H2.
    I tried to duplicate your error by substituting errors student often make; however, I never could come up with 1.93 L.

  • chem -

    thanks so its

    5.21 L h2?

  • chem -

    thanks for the help: can you help me with another one?

    Some sulfuric acid is spilled on a lab bench. It can be neutralized by sprinkling sodium bicarbonate on it and then mopping up the resultant solution. The sodium bicarbonate reacts with sulfuric acid as follows.

    2 NaHCO3(s) + H2SO4(aq) --> Na2SO4(aq) + 2 H2O(l) + 2 CO2(g)

    Sodium bicarbonate is added until the fizzing due to the formation of CO2(g) stops. If 34 mL of 6.0 M H2SO4 was spilled, what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid?


    i got 5.7 and it said my answer was off by more than 10%

  • chem -

    How much H2SO4 was spilled(how many moles?) M x L = 6.0 x 0.035 = 0.204
    Convert moles H2SO4 to moles NaHCO3. That will be 0.204 x 2 = 0.408.
    Now convert moles NaHCO3 to grams. g = moles x molar mass.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. science

    Hydrogen Cyanide (boiling temperature 26 degrees Celsius) is an important chemical for the production of nylon and various transparent plastics. It is produced on an industrial scale by the oxidation of methane in the presence of ammonia. …
  2. Chemistry - Equations

    I am a student in the ninth grade and I need help with the following problems because I do not understand how to do them. I appreciate your help and thanks once again. 7. in 2CO(grams) + O2(grams) => 2CO2(grams), what is the ratio …
  3. chem 3A

    please help me with these homework problems from chemistry because the teacher did not give enough information to some of these chemistry work problems. 1) 50.0 g of aluminum is reacted with excess sulfuric acid. The chemical equation …
  4. chemistry

    Hydrogen gas (a potential future fuel) can be formed by the reaction of methane with water according to the following equation: CH4(g)+H2O(g) = CO(g) + 3H2(g) In a particular reaction, 26.5 L of methane gas (measured at a pressure …
  5. chemistry

    Q1) 5 liters of Butane gas (C4H10) is reacted with plenty of oxygen at 27 oC and 1 atm to produce carbon dioxide and water vapor. Calculate the following: 1- The volume of CO2 produced at 1 atm and 400 oC. 2- The mass of H2O vapor …
  6. Chemistry

    In a reaction chamber, 3.0mol of aluminum is mixed with 5.3mol Cl2 and reacts. The reaction is described by the following balanced chemical equation. 2Al + 3Cl2 ==> 2AlCl3 a)Identify the limiting reagent for the reaction. b)Calculate …
  7. Chemistry

    Consider the following chemical reaction: C (s)+ H2O(g) --> CO(g)+ H2(g) How many liters of hydrogen gas are formed from the complete reaction of 1.20 mol of C?
  8. Chemistry

    Oxygen gas reacts with powdered aluminum according to the following reaction: 4Al(s)+3 O2(g) --> 2 Al2O3 (s) How many liters of O2 gas, measured at 789 mm Hg and 35 C, are required to completely react with 2.2 mol of Al?
  9. chemistry

    How many liters of HCl are produced by the reaction of 5.7 L of hydrogen with an equal amount of chlorine?
  10. Chemistry

    Calculate the number of liters of hydrogen gas at STP that could be produced by the reaction of 4.80g of magnesium with excess hydrochloric acid. Mg+HCl=MgCl2+H2

More Similar Questions