-390.3 KJ is the Hrxn for the reaction →
<h3>What is Hess's Law?</h3>
Hess's Law of Constant Heat Summation (or just Hess's Law) states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.
For Hess's Law, we need to get the corresponding equation below using the sequence of reactions given
By manipulating the reaction, either reversing them or multiplying/dividing them to a certain factor, we can get to the target equation as well as the total enthalpy.
→
→ ) ΔH = −74.6kJ (needs to reverse)
→ ΔH = −95.7kJ (retain)
→ ΔH = −184.6kJ (multiply by 2 to get and cancel out 4 HCl and )
Therefore, it is -390.3 KJ.
Hence, -390.3 KJ is the Hrxn for the reaction →
Learn more about the Hess's Law here:
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Answer:
<h2>The answer is option C</h2>
Explanation:
The percentage error of a certain measurement can be found by using the formula
From the question
actual density = 0.1478 g/mL
error = 0.1478 - 0.1369 = 0.0109
The percentage error is
We have the final answer as
<h3>7.375 %</h3>
Hope this helps you
A neutron is in the nucleus. The isotope symbol consists of the mass number and atomic number. <span>The mass number is the number of neutrons and protons. </span>
<span>Therefore adding neutrons affects the mass number. This means the symbol is affected.</span>
The answer to the question is A