Question

Tolong dong no. 4-9 (dengan caranya)
terima kasih

Answer 1

4. C2H5OH + 3 O2 → 2 CO2 + 3 H2O
ΔH = [(2 × ΔH CO2) + (3 × ΔH H2O)] - [ ΔH C2H5OH + (3 × ΔH O2)]
     = [(2 × -394) + (3 × - 240)] - [ -277 + (3 × 0)] = - 1231

ΔH = - ((50% × Q) ÷ mol)
- 1231 = - (( 50% × (100 × 4,2 × 30)) ÷ mol)
mol = 5,12

gr etanol = 5,12 × 46 = 235,41

5. C2H4 + 3 O2 → 2 CO2 + 2 H2O
ΔH = [(2 × ΔH CO2) + (2 × ΔH H2O)] - [ΔH C2H4 + (3 × ΔH O2)]
     = [(2 × -394) + (2 × -285)] - [52 + (3 × 0)] = - 1410 kJ/mol
ΔH = - (Q ÷ mol)
- 1410 = - (Q ÷ (6,72 ÷ 22,4))
Q = 423 kJ

6. CaCO3 → CaO + CO2
ΔH = (ΔH CaO + ΔH CO2) - (ΔH CaCO3)
     = (-635,5 + (- 394)) - (-1207) = 177,5

7. HCN → H^+ + CN^-      ΔH = + 42,8
   H^+ + OH^- → H2O      ΔH = - 53,2
  HCN + OH^- → H2O + CN^-  ΔH = - 10,4

8. (C2H5)2O + 6 O2 → 4 CO2 + 5 H2O    ΔH = - 2510
     4 CO2 + 5 H2O → C4H9OH + 6 O2      ΔH = + 2456
     (C2H5)2O → C4H9OH                          ΔH = - 54