Answer:
D. 450 J/kgK
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where:
Q = amount of heat absorbed/released (J)
m = mass of substance (g)
c = specific heat capacity
∆T = change in temperature (°C)
According to the information provided in this question:
Q = 267.3 kJ = 267300J
m = 18kg
∆T = 318K - 285K = 33K
c = ?
Q = m × c × ∆T
c = Q ÷ m∆T
c = 267300 ÷ 18 × 33
c = 267300 ÷ 594
c = 450 J/kgK
Answer:
I = 0.0931 A/cm^2 or 93.1 mA/cm^2
Explanation:
The computation of the corresponding corrosion is shown below:
As we know that
The mathematical form is
where,
m = substance mass
Q= total electric charge
F= Faradays constant i.e. = 96,500 C/mol
M = Substance molar mass
z = number of electrons transferred
Now
Q = It
where
I = current
And t = time
So,
Now it is mentioned that
z=3, M=26.98 g/mol, m=0.25 g/cm2
So,
Hence,
I = 0.0931 A/cm^2 or 93.1 mA/cm^2
Answer:
There will not be any ejection of photoelectrons
Explanation:
Energy of the photon= hc/λ
Where;
h= Plank's constant
c= speed of light
λ= wavelength of the incident photon
E= 6.6×10^-34 × 3 ×10^8/488 × 10^-9
E= 4.1 ×10^-19 J
Work function of the metal (Wo)= 2.9 eV × 1.6 × 10^-19 = 4.64 × 10^-19 J
There can only be ejected photoelectrons when E>Wo but in this case, E<Wo hence there will not be any ejection of photoelectrons.
Answer : The net ionic equation will be,
Explanation :
First we have to balance the chemical reaction.
The given balanced ionic equation will be,
In the net ionic equations, we are not include the spectator ions in the equations.
Spectator ions : The ions present on reactant and product side which do not participate in a reactions. The same ions present on both the sides.
The ionic equation in separated aqueous solution will be,
In this equation, are the spectator ions.
By removing the spectator ions from the balanced ionic equation, we get the net ionic equation.
The net ionic equation will be,