Answer:
The weakest conjugate base is C9H7O4⁻ which is the conjugate base of Aspirin.
Explanation:
The higher the Ka, the stronger the acid thus the weaker its conjugate base.
Ka of the acid are provided:
CH3COOH = 1.80*10-5
HC9H7O4 = 3.00*10-4
C6H5COOH = 6.30*10-5
From the Ka above, HC9H7O4 have the highest therefore its conjugate acid is the weakest.
When it donates the proton, it becomes the conjugate base.
HC9H7O4 + H2O ⇄ C9H7O4⁻ + H3O⁺
Answer:
Mg(s) + 2HCl(aq) → MgCl2(s) + H2(g)
Explanation:
Many metal undergo displacement reaction . The most reactive metal will displace the less reactive metal from it compound. A single displacement reaction is a reaction in which one element displaces another in it compound.
Many metal undergo displacement reaction with hydrogen chloride . One example is magnesium. Magnesium will displace hydrogen in hydrogen chloride because it is more reactive than hydrogen. The displacement reaction is as follow
Mg(s) + HCl(aq) → MgCl(s) + H2(g). The balanced equation with the simplest whole number ratio is as follows
Mg(s) + 2HCl(aq) → MgCl2(s) + H2(g)
Answer:
D
Explanation:
we use noble gas configuration of Kr because Kr atomic number is nearest to Sr
the atomic number of Kr and Sr
is equal to 36 and 38 based on this we write the electron configuration
1s2 ,2s2 , 2p6 , 3s2 , 3p6 , 4s2 , 3d10 , 4p6 === Kr and 5s2
Answer:
10.63 kJ/mol is the 
of the reaction.
Explanation:
To calculate of the reaction, we use Van't Hoff's equation, which is:
![\ln (\frac{K_1}{K_2})=\frac{\Delta H}{R}[\frac{1}{T_1}-\frac{1}{T_2}]](https://tex.z-dn.net/?f=%5Cln%20%28%5Cfrac%7BK_1%7D%7BK_2%7D%29%3D%5Cfrac%7B%5CDelta%20H%7D%7BR%7D%5B%5Cfrac%7B1%7D%7BT_1%7D-%5Cfrac%7B1%7D%7BT_2%7D%5D)
where,
= equilibrium constant at 
= equilibrium constant at 
= Enthalpy change of the reaction
R = Gas constant = 8.314 J/mol K
Given : 
= initial temperature = 
= final temperature = 
= ?
Putting values in above equation, we get:
![\ln(\frac{2.68\times 10^{-2}}{2.60\times 10^{-2}})=\frac{\Delta H}{8.314J/mol.K}[\frac{1}{1110 K}-\frac{1}{1140 K}]](https://tex.z-dn.net/?f=%5Cln%28%5Cfrac%7B2.68%5Ctimes%2010%5E%7B-2%7D%7D%7B2.60%5Ctimes%2010%5E%7B-2%7D%7D%29%3D%5Cfrac%7B%5CDelta%20H%7D%7B8.314J%2Fmol.K%7D%5B%5Cfrac%7B1%7D%7B1110%20K%7D-%5Cfrac%7B1%7D%7B1140%20K%7D%5D)
10.63 kJ/mol is the of the reaction.
