QUESTION 13
Use the standard reaction enthalpies given below to determine AHºrn for the followi
C(s) + H2O(g) - CO(g) + H2(9)
Given:
Reaction 1: C(s) + O2(g) – CO2(g) AHºrxn = -605 kJ
Reaction 2: 2 CO(g) + O2(g) – 2 CO2(g) AH°x = -966 kJ
Reaction 3: 2 H2(g) + O2(g) → 2 H2O(g) AHⓇx = -638 kJ

The for the reaction is 212 kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, the chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to yield the required equation. That means the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The net reaction is

The intermediate balanced chemical reaction will be,

(1)    

(2)    

(3)    

Therefore, the for the reaction is 212 kJ

answer: a tank of height h is filled with water and sits on the ground. water squirts from a hole at a height y above the ground and has a range r. for two y values, 0 and h, r is zero. determine the value of y for which the range will be a maximum.

explanation:

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).