-390.3 KJ is the Hrxn for the reaction
→ ![CCl_4(l) + HCl(g).](https://tex.z-dn.net/?f=CCl_4%28l%29%20%2B%20HCl%28g%29.)
<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.
→ ![CCl_4(g) + 4HCl(g)](https://tex.z-dn.net/?f=CCl_4%28g%29%20%2B%204HCl%28g%29)
→
) 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
→ ![CCl_4(l) + HCl(g).](https://tex.z-dn.net/?f=CCl_4%28l%29%20%2B%20HCl%28g%29.)
Learn more about the Hess's Law here:
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From the density of ethanol given, the number of pounds of ethanol in the drum will be 46.099 pounds.
<h3>How to calculate density</h3>
Density of ethanol = 0.789/cm³
1 gallon = 3785.4ml
Volume of ethanol = 7 gallons = 7 × 3785.4ml = 26497.8ml
Mass of ethanol = Volume × Density.
= 26497.8 × 0.789
= 20906.764g
Since 1g = 0.002205 pounds, the mass of ethanol will be:
= 20906.764 × 0.002205
= 46.099 pounds.
Learn more about density on:
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I believe it's C. Elements. Elements can't be separated by physical means unlike mixtures and solutions.