Which pair shares the same empirical formula?
1 answer:
Answer:- 3. and
Explanations:- An empirical formula is the simplest whole number ratio of the moles of atoms present in the compound.
If we simplify the first par formula then they becomes and CH. This pair does not share the same empirical formula.
Second pair formulas are already simple and could not be further simplify. Since they are different, it is also not the right option.
Fourth pair has CH and .
could be simplify to
. The two formulas are still different and so it is not the right choice.
The only correct one is third pair as one of them is and other one is
could be simplify to
. This pair share the same empirical formula,
.
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<u>Answer:</u> When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
<u>Explanation:</u>
Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.
According to this law, the chemical equation is treated as ordinary algebraic expressions and can be added or subtracted to yield the required equation. This means that the enthalpy change of the overall reaction is equal to the sum of the enthalpy changes of the intermediate reactions.
The overall chemical reaction follows:
The intermediate balanced chemical reaction are:
(1)
(2)
The expression for enthalpy of the reaction follows:
Hence, when the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.