Consider the below electrochemical cell at standard conditions. Which of the following changes would result in a voltage larger than 1.29 V? 4MnO4^1− (aq) + 4H+ (aq) ↔ 4MnO2 (s) + 3O2 (g) + 2H2O E=1.29 V
a. Increase the partial pressure of oxygen gas.
b. Increase the mass of solid manganese(IV) oxide present.
c. Increase the pH.
d. Increase the concentration of potassium permanganate.

h let me think

convalent bond :

is a chemical bond formed by the sharing of electron between 2 atoms.

it is the direct chemical bond between 2 atoms.

in bond formation atoms are involved here.

electrovalent bond:

is a chemical bond defined as electroststic attraction between 2 atoms.

it is the electrostatic attraction between 2 atoms.

in bond formation, ions are involved here.

hope it

and ur welcm

: )

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol