Given the reactions, x ( s ) + 1 2 o 2 ( g ) ⟶ xo ( s ) δ h = − 505.9 kj xco 3 ( s ) ⟶ xo ( s ) + co 2 ( g ) δ h = + 199.3 kj what is δ h for this reaction? x ( s ) + 1 2 o 2 ( g ) + co 2 ( g ) ⟶ xco 3 ( s )

-705.2 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.

      (1)

 (2)

The final reaction is:  

    (3)

Reversing (2)

 (2')

By adding (1) and (2')

Hence .

answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

hope it

the answer is b. dilution