Answer:
Keqq = 310
Note: Some parts of the question were missing. The missing values are used in the explanation below.
Explanation:
<em>Given values: ΔH° = -178.8 kJ/mol = -178800 J/mol; T = 25°C = 298.15 K; ΔS° = -552 J/mol.K; R = 8.3145 J/mol.K</em>
Using the formula ΔG° = -RT㏑Keq
㏑Keq = ΔG°/(-RT)
where ΔG° = ΔH° - TΔS°
㏑Keq = ΔH° - TΔS°/(-RT)
㏑Keq = {-178800 - (-552 * 298.15)} / -(8.3145 * 298.15)
㏑Keq = -14221.2/-2478.968175
㏑Keq = 5.73674166
Keq = e⁵°⁷³⁶⁷⁴¹⁶⁶
Keq = 310.05
Answer:
Entropy increases
Explanation:
Entropy (S) is a measure of the degree of disorder. For a given substance - say water - across phases the following is true ...
S(ice) < S(water) << S(steam)
For a chemical process, entropy changes can be related to increasing or decreasing molar volumes of gas from reactant side of equation to product side of equation. That is ...
if molar volumes of gas increase, then entropy increases, and
if molar volumes of gas decrease, then entropy decreases.
For the reaction 2KClO₃(s) => 2KCl(s) + 3O₂(g)
molar volumes of gas => 0Vm* 0Vm 3Vm
*molar volumes (Vm) apply only to gas phase substances. Solids and liquids do not have molar volume.
Since the reaction produces 3 molar volumes of O₂(g) product vs 0 molar volumes of reactant, then the reaction is showing an increase in molar volumes of gas phase substances and its entropy is therefore increasing.
Answer:
The right choice is CHCl₃
Explanation:
- <u>To find the empirical formula firstly, change the mass to moles.</u>
For Carbon :
no. of moles = (mass / molar mass) = (5.03 g / 12 g/mol )= 0.42 mol
<u><em>For Hydrogen :</em></u>
no. of moles = (mass / molar mass) = (0.42 g / 1 g/mol )= 0.42 mol
<u><em>For Chlorine :</em></u>
no. of moles = (mass / molar mass) = (44.5 g / 35.5 g/mol )= 1.25 mol
The ratio for Carbon and Hydrogen is 1 : 1
0.42 mol / 042 mol =1.00
- <u>
Then find a ratio between the moles.
</u>
The ratio of Chlorine to both Carbon and Hydrogen is 3:1
1.25 mol / 0.42 mol = 2.98 ≅ 3
So the ratio is 1 C : 1 H : 3 Cl.
So, the right choice is CHCl₃
Carbon usually forms four bonds one to Hydrogen and 3 to Chlorine atoms.
Chlorine usually forms one bond to Carbon atom.
Hydrogen usually forms one bond Carbon atom.
You can determine the number of electrons by valence electrons
Answer: Option (b) is the correct answer.
Explanation:
When useful energy is conserved then this conservation is known as energy conservation.
For example, when lights of a room are switched on where no one is sitting then on switching off the lights we are conserving wastage of electricity.
Thus, we can conclude that out of the given options, the statement energy resources can be conserved by turning off lights when they are not in use is true.
