-A molecule consists of two or more atoms that are chemically joined together
Example of molecule: H2 (molecular hydrogen); it has two hydrogen atoms
-A compound IS a molecule that consists of two different types of elements
Example of compound: H2O (water); it has two hydrogen atoms and one oxygen atom
Atmospheric
pressure<span>, sometimes also called barometric pressure, is the pressure exerted by the weight of air in
the </span>atmosphere of Earth<span> (or that of another planet)</span>
1 atm is equivalent to = 101325
Pa
= 760 mmHg
= 760 torr
= 1.01325 bar
So 1.23 atm is equal to
= 124629.8 Pa
= 934.8 mmHg
= 934.8 torr
<span>= 1.2462 bar</span>
Answer:
Enthalpy change is 6007 J
Entropy change is
Gibb's free energy change is 0 J.
Explanation:
From the given,
The enthalpy change for the melting of ice =
Temperature =
Let's convert the temperature centigrade into Kelvin.
Number of moles of ice = 1.00 mol
Enthalpy change of 1.00 mol temperature
Therefore, Enthalpy change () for the melting of 1.00 mole of ice at temperature is 6007 J.
Entropy change for the melting of 1.00 mole of ice at :
Therefore, Entropy change() for the melting of 1.00 mole of ice at temperature is .
The Gibb's free energy change is expressed by the following formula.
Therefore, Gibb's free enrgy change () for the melting of 1.00 mole of ice at temperature is
Answer:
[H3O+] = 0.0117 M
[OH-] = 8.5 * 10^-13 M
Explanation:
Step 1: Data given
Concentration of HCl = 0.0117 M
Step 2:
HCl is a strong acid
pH of a strong acid = -log[H+] = - log[H3O+]
[H3O+] = 0.0117 M
pH = -log(0.0117)
pH = 1.93
pOH =14 - 1.93 = 12.07
pOH = -log[OH+] = 12.07
[OH-] = 10^-12.07 = 8.5 * 10^-13
Or
Kw / [H3O+] = [ OH-]
10^-14 / 0.0117 = 8.5*10^-13
<h3><u>Answer and explanation</u>;</h3>
- To balance the charges of ions the number of electrons lost is equal to the number of electrons gained. The overall net charge must be zero.
- The number of ions needed to accomplish this is represented by the subscripts.
- For any given ionic compound, the product of the charge on the ion (or multiatomic ionic group) times the subscript of the ion will give a total charge of zero when all ions are considered.
For examples: NaCl Na = +1 Cl = -1 total is zero