Answer:
option b is correct
Explanation:
Taking the Van't Hoff equation
d ln Keq / dT = ΔH/(RT²)
then
Keq increases with increasing temperature (d ln Keq / dT>0) when ΔH>0 and decreases with increasing temperature (d ln Keq / dT<0) when ΔH<0
if Keq decreases (reactions shift toward reactants) from 7.9×10³ to 0.77 when temperature increases from 298 K to 713 K (d ln Keq / dT<0) → ΔH<0 ( exothermic reaction)
therefore option b is correct
Answer:
<em>1. flour = insoluble </em>
<em>2. salt = soluble </em>
<em>3</em><em>. sugar = soluble </em>
<em>4. peeper = Insoluble </em>
<em>5. mango seed = insoluble </em>
Explanation:
hope this answer will help you.
Feels slippery would be the correct answer
The question is incomplete, complete question is :
A chemist must dilute 73.9 mL of 400 mM aqueous sodium carbonate solution until the concentration falls to 125 mM . He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Be sure your answer has the correct number of significant digits.
Answer:
The final volume of the solution will be 0.236 L.
Explanation:
Concentration of sodium carbonate solution before dilution =![M_1= 400 mM](https://tex.z-dn.net/?f=M_1%3D%20400%20mM)
Volume of sodium carbonate solution before dilution = ![V_1=73.9 mL](https://tex.z-dn.net/?f=V_1%3D73.9%20mL)
Concentration of sodium carbonate solution after dilution =![M_2= 125 mM](https://tex.z-dn.net/?f=M_2%3D%20125%20mM)
Volume of sodium carbonate solution after dilution = ![V_2=?](https://tex.z-dn.net/?f=V_2%3D%3F)
Dilution equation is given by:
![M_1V_1=M_2V_2](https://tex.z-dn.net/?f=M_1V_1%3DM_2V_2)
![V_2=\frac{M_1V_1}{M_2}](https://tex.z-dn.net/?f=V_2%3D%5Cfrac%7BM_1V_1%7D%7BM_2%7D)
![V_2=\frac{400 mM\times 73.9 mL}{125 mM}= 236.48 mL\approx 236 mL](https://tex.z-dn.net/?f=V_2%3D%5Cfrac%7B400%20mM%5Ctimes%2073.9%20mL%7D%7B125%20mM%7D%3D%20236.48%20mL%5Capprox%20236%20mL)
1 mL = 0.001 L
236 mL = 0.236 L
The final volume of the solution will be 0.236 L.