3.  Diketahui reaksi:

     C_(s) + O_{2(g)       →}  CO_2(g)                                       ∆H  = - 94 kkal

     2H_2(g) + O_{2g)       →}    4H₂O_(l)                                  ∆H  = - 136 kkal

    3C_(s) + 4H_{2(g)      →}  C₃H_8(g)                                           ∆H  = - 24 kkal

   Hitunglah ∆H reaksi:

     C₃H_8(g) + 5O_{2(g)   →}  3CO_2(g) + 4H₂O_(l)

 

     Jawab

   C₃H_{8(g)                         →}   3C_(s) + 4H_2(g)                                 ∆H  = + 24 kkal          x1         

    3C_(s) + 3O_{2(g)         →}  3CO_2(g)                                              ∆H  = - 94 kkal           x 3

   2H_2(g) + O_{2g)             →}    4H₂O_(l)                                            ∆H  = - 136 kkal           x 2      +

  ________________________________________________________________________

   C₃H_{8(g)                           →} 3C_(s) + 4H_2(g)                                  ∆H  = + 24 kkal           

     3C_(s) + 3O_{2(g)          →}  3CO_2(g)                                             ∆H  = - 282 kkal            

   4H_2(g) + O_{2g)              →}    4H₂O_(l)                                           ∆H  = - 272 kkal                     +

   ____________________________________________________________________

  C₃H_8(g) + 5O_{2(g)  →}  3CO_2(g) + 4H₂O_(l)                                        ∆H  = -530 kkal

 

 

 

4.  C₆H₁₂O_6(aq)  +  6O_{2 (g)   →}   6CO_2(g) + 6H₂O_(l)                                                  ∆H  = - 2820 kJ

C₂H₅OH_(aq) +  6O_{2 (g)   →}    2CO_2(g) + 3H₂O_(l)                                                 ∆H  = - 1380 kJ

Hitunglah ∆H reaksi:

C₆H₁₂O_{6(aq)   →}   C₂H₅OH_(aq) + 2CO_2(g)

 

 

 

Jawab

C₆H₁₂O_6(aq)  +  6O_{2 (g)   →}   6CO_2(g) + 6H₂O_{(l )}                                ∆H  = - 2820   kJ        x 1

 2CO_2(g) + 3H₂O_{(l)             →}       C₂H₅OH_(aq) +  3O_{2 (g)}                   ∆H  = + 1380  kJ  +    x 2

 

________________________________________________________________________

C₆H₁₂O_6(aq)  +  6O_{2 (g)    →}    6CO_2(g) + 6H₂O_{(l )}                              ∆H  = - 2820   kJ       

                 4CO_2(g) + 6H₂O_{(l)               →}     2C₂H₅OH_(aq) +  6O_{2 (g)}                 ∆H  = + 1380        kJ  + 

_________________________________________________________________________________

C₆H₁₂O_{6(aq)                                →}       2C₂H₅OH_(aq) + 2CO_2(g)                             ∆H  = - 60 kJ

 

 

 

Latihan 3.1

1.    Diketahui reaksi:

C_(s) + O_{2(g)                →} CO_2(g)                                                    ∆H  = - 94 kkal

2H_2(g) + O_{2(g)                      →}   2H₂O_(l)                                            ∆H  = - 136 kkal

C_(s) + 2H_2(g) + O_{2(g)    →} C₃H₇COOH_(aq)                                                ∆H  = -125 kkal

Hitunglah ∆H reaksi:

C₃H₇COOH_(aq) + 5O_{2(g)  →}   4CO_2(g) + 4H₂O_(l)

 

2.    N₂H_4(g) + O_{2(g)      →} N_{2 (g)} + 2H₂O_(l)                                          ∆H  = - 622 kJ

2H_2(g) + O_{2(g)            →}   2H₂O_(l)                                                    ∆H  = - 570 kJ

H_2(g) + O_{2(g)               →}    H₂O_2(aq)                                                  ∆H  = - 188 kJ

Hitunglah ∆H reaksi:

N₂H_4(g) + 2H₂O_{2(aq)        →}   N_{2 (g)} + 4H₂O_(l)

 

3.    XO₂ + CO      _→  XO + CO₂                                                     ∆H  = - 200 kJ

X₃O₄ + CO     _→  3XO + CO₂                                                   ∆H  = + 60 kJ     

3X₂O₃ + CO   _→  2X₃O₄ + CO₂                                                ∆H  = - 120 kJ

Hitunglah ∆H reaksi:

2XO₂ + CO     _→ X₂O₃ + CO₂

 

4.    CS_2(s) + 3O_{2(g)   →} CO_2(g) + 2SO_2(g)                                           ∆H  = - 1077 kJ

2S_(s) + Cl_{2(g)      →} S₂Cl_2(aq)                                                                            ∆H  = - 60 kJ

C_(s) + 2Cl_{2(g)      →} CCl_4(aq)                                                                            ∆H  = - 103 kJ

S_(s) + O_{2(g)                →}   SO_2(g)                                                                          ∆H  = - 300 kJ

C_(s) + O_{2(g)         →}  CO_2(g)                                                          ∆H  = - 394 kJ    

Hitunglah ∆H reaksi:

CS_2(s) + 3Cl_{2(g)  →}    CCl_4(aq) + S₂Cl_2(aq)