Answer: conversion of ice to steam
Explanation: Endothermic process is one in which energy is absorbed by the system.
Conversion of ice to steam is change of solid phase to gaseous phase, thus energy is required to break the strong inter molecular forces of attraction in solids to convert it into gaseous phase.
Conversion of steam to ice, conversion of steam to water and conversion of water to ice releases energy and are examples of exothermic processes.
9.04354 * 10^2
The “*” identifies as a multiplication sign. Hope this helps
The given question is incomplete. The complete question is:
An acidic solution at 25°C will have a hydronium ion concentration ________ and a pH value ________.
![[H_3O^+]](https://tex.z-dn.net/?f=%5BH_3O%5E%2B%5D)
> 
M, pH < 7.00
< , pH < 7.00
< ,, pH > 7.00
> ,, pH > 7.00
Answer: > M, pH < 7.00
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution.
pH is calculated by taking negative logarithm of hydrogen ion concentration.
Acids have pH ranging from 1 to 6.9, bases have pH ranging from 7.1 to 14 and neutral solutions have pH equal to 7.
![pH=-\log [H_3O^+]](https://tex.z-dn.net/?f=pH%3D-%5Clog%20%5BH_3O%5E%2B%5D)
![7=-log[H_3O^+]](https://tex.z-dn.net/?f=7%3D-log%5BH_3O%5E%2B%5D)
![[H_3O^+]=10^{-7}](https://tex.z-dn.net/?f=%5BH_3O%5E%2B%5D%3D10%5E%7B-7%7D)
As pH of acids is less than 7, the hydronium ion concentration is greater than
Thus the correct option is > M, pH < 7.00
<span>Kp is the equilibrium pressure constant calculated from the partial pressures of a reaction equation.
Kp =[pCF4]*[p CO2] / [p COF2]^2 = 2.2 x 10^6
When the mole fraction gets doubled we have
Kp = [pCO2]^2*[pCF4]^2 / [pCOF2]^4
Kp = [[pCF4]*[p CO2] / [p COF2]^2] * 2
Kp = (2.2 * 10^6) * 2
Kp = 4.8 * 10^12</span>
