Chemistry

Question

Consider the reaction below. 2H2O 2H2 + O2 How many moles of hydrogen are produced when 6.28 mol of oxygen form?
A. 3.14 mol
B. 6.28 mol
C. 12.6 mol
D. 25.2 mol

2 Answer

  • 1) Write the balanced equation

    2 H2O ----> 2 H2 + O2

    2) State the molar ratios:

    2 mol H2O : 2 mol H2 : 1 mol O2.

    3) Write the proportion with the theoretical ratios and the actual data:

    [2 mol H2 / 1 mol O2 ] = x mol H2 /  6.28 mol O2]

    You can realize that this tells that the number of moles of H2 produced is the double of the number of moles of O2 produced.

    4) Solve for x

    x = 6.28 mol O2 *  2 mol H2 / 1 mol O2 = 12.56 mol O2.

    Answer: option C. 12.6 mol
  • 12.6 mol moles of hydrogen are produced when 6.28 mol of oxygen forms.

    The correct option is C.

    What are moles?

    The mole is the amount of substance in a system that includes the same number of elementary units as there are atoms in 0.012 kilograms of carbon 12; it is represented by the sign "mol."

    Given,

    The balanced equation                

    [tex]\bold{ 2H_2O = 2H_2 + O_2}[/tex]

    The molar ratio is

    [tex]\bold{2\; mol\; H_2O : 2\; mol\; H_2 : 1\; mol\; O_2.}[/tex]

    The proportion with the theoretical ratio

    [tex]\bold{ \dfrac{2 mol H_2}{1 mol O_2}= \dfrac{x mol H_2}{ 6.28 mol \;O_2} }[/tex]

    [tex]\bold{x = 6.28\; mol O_2 \times \dfrac{2\; mol H_2}{1 mol O_2 } = 12.56\; mol\; O_2.}[/tex]

    Thus, the moles of hydrogen produced is (C). 12.6 mol.

    Learn more about moles, here:

    https://brainly.com/question/15209553

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