The balanced chemical equation below represents the formation of magnesium chloride. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)

Question

The balanced chemical equation below represents the formation of magnesium chloride.

Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)

At STP, what is the total number of liters of hydrogen gas produced when 3.00 moles of hydrochloric acid solution-HCl(aq) is completely consumed?
A.22.4 L

B.11.2 L

C.33.6 L

D.44.8

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Thạch Thảo 3 years 2021-09-05T13:42:09+00:00 1 Answers 17 views 0

Answers ( )

  1. kiet
    1
    2021-09-05T13:43:36+00:00
    Reply

    Answer:

    C. 33.6L

    Explanation:

    Based on the reaction, 2 moles of HCl reacts producing 1 mole of hydrogen.

    To solve this question we must find the moles of hydrogen produced using the reaction. Then, with combined gas law (PV = nRT) we can find the volume produced:

    Moles H2:

    3.00 moles HCl * (1mol H2 / 2mol HCl) = 1.50 moles H2 are produced

    Volume:

    PV = nRT

    V = nRT / P

    Where P is pressure = 1atm at STP

    V is volume = Our incognite

    n are moles of the gas = 1.50 moles

    R is gas constant = 0.082atmL/molK

    T is absolute temperature = 273.15K

    V = nRT / P

    V = 1.50mol*0.082atmL/molK*273.15K / 1atm

    V = 33.6L

    C. 33.6L

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )