Determination of delta H(formation) of MgO. data table: Mg. MgO. mass of weigh d

Question

Determination of delta H(formation) of MgO.

data table:                    Mg.                  MgO.
mass of weigh dish 1.732g            1.702g
mass dish+sample    1.886g.         1.953g
mass of sample.         0.154g.         0.251g
molecular weight.        24.305g.    40.31g
#of moles.            6.34×10^-3. 6.23×10^-3
mass of Styrofoam.    8.233g.      9.302g
mass Styro+react. mix. 33.519g 34.491g
mass of reaction mix. 25.286g. 25.189g
T intial                             20.60'C   22.10'C
T final.                             49.81'C   25.15'C
delta T.                            29.21'C    3.05'C

solve for q, heat transferred, delta H reaction and delta H formation of MgO for both sets of data.

please show me how to do this step-by-step.

and how to balance
the equations for reactions between these data sets. where 25.0 ml of 1 mol HCl was mixed with 0.154g of Mg solid.
And the repeated 25.0mL of 1 mol HCl with 0.251g of MgO with the second reaction mixture.

thank you.

9

Explanation / Answer

25 ml of 1mol HCl is mixed with 0.154gr of Mg :

      Mg + 2HCl -----------> MgCl2 + H2

25ml of 1mol HCl is mixed with 0.251gr of MgO

    MgO + 2HCl --------------> MgCl2 + H2O

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