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28 July, 00:50

When the following equation is balanced, what is the coefficient for HCl? Mg (s) + HCl (aq) → MgCl2 (aq) + H2 (g)

2

1

3

6

+5
Answers (1)
  1. 28 July, 03:53
    0
    We have:

    M

    g

    (

    s

    )

    +

    H

    C

    l

    (

    a

    q

    )



    M

    g

    C

    l

    2

    (

    a

    q

    )

    +

    H

    2

    (

    g

    )

    LHS

    Mg = 1

    H = 1

    Cl = 1

    RHS

    Mg = 1

    Cl=2

    H=2

    To make Cl and H have 2 on both sides, we place a 2 in front of the HCl

    M

    g

    (

    s

    )

    +

    2

    H

    C

    l

    (

    a

    q

    )



    M

    g

    C

    l

    2

    (

    a

    q

    )

    +

    H

    2

    (

    g

    )

    LHS

    Mg=1, H=2, Cl=2

    RHS

    Mg=1, H=1, Cl=2

    Thus the equation is balanced and the coefficient of Mg is 1, which is understood so it is not written in the final equation.
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