Answer:
the packing efficiency is 52.36%
Explanation:
Given the data in the question;
simple cubic unit cell that contains one atom with a metallic radius of 175 pm;
we know that;
Edge length of Simple cubic (a) is related to radius of atom (r) as follows;
a = 2r
since radius r = 175 pm
we substitute
a = 2 × 175 pm
a = 350 pm
Now we get the volume unit;
Volume of unit cell = a³ = ( 350 pm ) = 42875000 pm³
Next we get Volume of sphere;
Volume of Sphere = πr³
Volume occupied by 1 atom = × π × ( 175 pm )³
= × π × 5359375 pm³
= 22449297.5 pm³
Now, the packing efficiency = ( Volume occupied by 1 atom / Volume of unit cell ) × 100
we substitute;
packing efficiency = ( 22449297.5 pm³ / 42875000 pm³ ) × 100
= 0.523598 × 100
= 52.36%
Therefore, the packing efficiency is 52.36%
Answer:
g = 1.11x10⁻⁵Ω.
Explanation:
The membrane conductance (g) can be calculated by dividing membrane current (I) through the driving force (Vm - E) as follows:
<em>where Vm: is the membrane potential and </em><em>: is the equilibrium potential for the ion or reversal potential. </em>
The equilibrium potential for the ion can be calculated using the Nernst equation:
<em>where R: is the gas constant = 8.314 J/K*mol, F: is the Faraday constant = 96500 C/mol, T: is the temperature (K), z: is the ion's charge, [ion]out and [ion]ins: is the concentration of the ion outside and inside, respectively. </em>
Now, we can calculate the membrane conductance (g) using equation (1):
Therefore, the membrane conductance is 1.11x10⁻⁵Ω.
I hope it helps you!
Answer:
Molarity = 1 mol.L⁻¹
Solution:
Molar concentration (Molarity) is given as,
Molarity = Moles / Volume of Solution ------ (1)
Data Given;
Moles = 4 mol
Volume = 4 L
Putting Data in Eq. 1,
Molarity = 4 mol ÷ 4 L
Molarity = 1 mol.L⁻¹
Answer: C5H14N2
Explanation:
The element mass are:
C = 58.77 g
H = 13.81 g
N = 27.42 g
To get their moles, we have to divide by the molar mass which will be:
C: 58.77 / 12.01 = 4.8934
H: 13.81 / 1.008 = 13.7004
N: 27.42 / 14.01 = 1.9572
We then divide by the smallest mole which will be:
C: 4.8934 / 1.9572 = 2.5
H: 13.7004 / 1.9572 = 7
N: 1.9572 / 1.9572 = 1
We then multiply by 2 so that we can get whole number ratio:
C: 2.5 × 2 = 5
H: 7 × 2 = 14
N: 1 × 2 = 2
Therefore, the empirical formula will be = C5H14N2