The temperature dropped because B. energy was absorbed during the chemical reaction.
If energy was released, the temperature would rise. If there was no energy input, the temperature would stay the same. Since temperature dropped, it means that energy was absorbed.
Answer:
Explanation:
The correct statement is:
When 1 mol each of C₂H₅OH and CH₃CO₂H are allowed to react in 1 L of the solvent dioxane, equilibrium is established when 1/3 mol of each of the reactants remains. Calculate the equilibrium constant for the reaction. (Note: Water is a solute in this reaction.)
<u>1. Equilibrium equation</u>
- C₂H₅OH + CH₃CO₂H ⇄ CH₃CO₂C₂H₅ + H₂O
↑ ↑ ↑ ↑
ethanol acetic acid ethyl acetate water
<u>2. Equilibrium constant</u>
- Keq = [Products] / [Reactants], each raised to tis stoichiometrical coefficient.
Since water is also a solute in this reaction (the solvent is dioxane) its concentration will appear in the equilibrium constant.
<u>3. Equlibrium concentrations:</u>
Moles
C₂H₅OH + CH₃CO₂H ⇄ CH₃CO₂C₂H₅ + H₂O
Initial 1 1 0 0
Change -2/3 -2/3 +2/3 +2/3
End 1/3 1/3 2/3 2/3
Since the volume is 1 liter, the concentration is equal to the number of moles
<u>4. Calculations:</u>
![Keq=\frac{[CH_3CO_2C_2H_5]\cdot [H_2O]}{[C_2H_5OH]\cdot [CH_3CO_2H]}=\frac{2/3\cdot 2/3}{1/3\cdot 1/3}=4](https://tex.z-dn.net/?f=Keq%3D%5Cfrac%7B%5BCH_3CO_2C_2H_5%5D%5Ccdot%20%5BH_2O%5D%7D%7B%5BC_2H_5OH%5D%5Ccdot%20%5BCH_3CO_2H%5D%7D%3D%5Cfrac%7B2%2F3%5Ccdot%202%2F3%7D%7B1%2F3%5Ccdot%201%2F3%7D%3D4)
Size
The Sun is 1,390,000 km in diameter. That compares with 12,756 km for diameter of the Earth. In other words, the diameter of the Sun is over 100 times the diameter of the Earth.
In June, 2004, Venus passed in front of the Sun, as seen from the Earth. Since the diameter of Venus is only slightly less than that of Earth (12,104 km)
Mass
The mass of the Sun is about 2 x 1030 kilograms (2 followed by 30 zeros). It is one of the larger stars in our Milky Way galaxy. The median size of stars in our galaxy is less than half the mass of the Sun. In comparison, the Earth is 6 x 1024 kg. This means that the mass of the Sun is over 300,000 times greater than that of the Earth.
other than its Big,Orangish-yellowish, round like a ball, and extremly hot