The reaction corresponds to the combustion of propane (C3H8). The balanced reaction is:
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)
The reaction enthalpy is given as:
ΔHrxn = ∑nΔH°f(products) - ∑ nΔH°f(reactants)
= [3ΔH°f(CO2(g)) + 4ΔH°f(H2O(g)] - [1ΔH°f(C3H8(g)) + 5ΔH°f(O2(g)]
= [3(-393.5) + 4(-241.8)] - [-103.9 + 5(0)] = -2043.8 kJ
The enthalpy for the combustion of propane is -2044 kJ
Answer: The percent ionization of 
in a 0.050 M 
solution is 8.9 %
Explanation:
cM 0 0
So dissociation constant will be:
Give c= concentration = 0.050 M and 
= degree of ionisation = ?
Putting in the values we get:
percent ionisation =
The effective nuclear charge is the net positive charge experienced by valence electrons
<span>If "hf" is the standard heat of formation, the Hf for Al is zero -- as it is for all elements in their standard state. The standard heat of formation for water is −285.8 kJ/mol. Thank you for posting your question here. I hope the answer helps. </span>
Based on the information given, it should be noted that sound travels through air, and putting your ear to a wall will not allow the person to hear the noise on the other side better. Therefore, it is false.
<h3>How does sound travel?</h3>
It should be noted that when sound is created, the air particles vibrate and collide with each other. The vibrating particles pass the sound through to a person's ear and then vibrate in the eardrum.
Sound travels through air, and putting your ear to a wall will not allow the person to hear the noise on the other side better. In such a case, the noise will be better heard when it travels through the air.
In conclusion, sound needs a medium such as air to travel.
Learn more about sound on:
brainly.com/question/9349349
