Chemistry
Q8
How many kJ of heat will be evolved in
making 22.4 L at STP (1.00 mol) of H2S
from Fes and dilute hydrochloric acid?
The enthalpies of formation of Fes(s), H
(aq), Fe2+(aq), Cl-(aq), H2S (g) are -95.4,0,
-87.9, -167.0,-20.6 kcal/mol respectively.
-180.1 kJ/mol
/
+180.1 kJ/mol
-13.1 kcal/mol
-13.1 kJ/mol
Answers
Answered by
2
Answer:
87.9" (and any subsequent words) was ignored because we limit queries to 32 words
Answered by
1
Answer:
The amount of heat evolved in making 22.4 L at STP (1.00 mol) of H₂S is -13.1 kJ/mol.
Explanation:
FeS (ferrous sulphide) reacts with dilute HCl to form FeCl₂ (ferrous chloride) and H₂S (hydrogen sulphide).
The reaction is given below.
FeS + 2H⁺ → Fe²⁺ + H₂S
The amount of heat evolved in making 22.4 L at STP (1.00 mol) of H₂S can be calculated as shown below.
ΔH° = (-87.9 + -20.6) - (-95.4)
= -13.1 kJ/mol
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