The complete combustion of 1.00 kg of coal releases about 3.0 x 10E7 J of energy. The conversion of 1.00 kg of mass into energy
2 answers:
Answer: 0.001 metric tonnes
Explanation:
According to Einstein equation, Energy and mass are inter convertible.
E= Energy
m = mass
c= speed of light
Given : Complete combustion of 1.00 kg of coal releases about of energy.
Given mass: 1 kg
Converting kg to metric ton using the conversion factor:
1 kg=0.001 metric tonnes
Thus 1 kg of coal would also be equal to 0.001 metric tonnes.
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❖ <u>Packing Efficiency</u> ❖
➪ The percentage of total space occupied by particles is called <u>packing efficiency</u>.
❖ Packing efficiency of simple cubic structure (SCC).❖
❒ Since, simple cubic unit cell contain 1 atom (sphere). So, the total volume of sphere will be :
- Volume of unit cell = a³
- Volume of unit cell = (2r)³
- Volume of unit cell = 8r³
❒ <u>Now, we know that</u>,❒
➪ Substituting the known values in the formula, we get the following results:
❒ Hence, the packing efficiency of simple cubic structure is 52.4%.
➪ Packing efficiency of cubic close packing (SCC)/face centred cubic structure (FCC).
❒ Since, simple cubic unit cell contain 2 atom (sphere). So, the total volume of sphere will be:
- Volume of unit cell = a³
Volume of unit cell = (2√2r)³
Volume of unit cell = 16√2r³
❒ <u>Now, we know that</u>,❒
➪Substituting the known values in the formula, we get the following results:
❖ Hence, the packing efficiency of face centred cubic structure is 74%.
❖ Packing efficiency of body cubic structure (BCC).
❒ Since, simple cubic unit cell contain 2 atom (sphere). So, the total volume of sphere will be:
- Volume of unit cell = a³
Volume of unit cell = (4r/√3)³
Volume of unit cell = 64r³/3√3
❒ <u>Now, we know that</u>,❒
➪Substituting the known values in the formula, we get the following results:
❒ Hence, the packing efficiency of body centred cubic structure is 68%.