Marie Curie in 1898
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Answer:
Iron has 5 unpaired electrons in Fe⁺³ state.
Explanation:
Iron having atomic number 26 has following electronic configuration in neutral state.
Fe = 1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d⁶
When Iron looses three electrons it attains +3 charge with following electronic configuration.
Fe⁺³ = 1s², 2s², 2p⁶, 3s², 3p⁶, 3d⁵
The five electrons in d-orbital exist in unpaired form as,
3(dz)¹, 3d(xz)¹, 3d(yz)¹, 3d(xy)¹, 3(dx²-y²)¹
Answer: option A. Cobalt
Explanation:
1) Data:
Q = 1.24 × 10⁶ J
m = 2 kg
Tf = 1768 K
Ti = 298 K
Cs = ?
2) Formula:
Q = m Cs ΔT
ΔT = Tf - Ti = 1,768K - 298K = 1,470K
3) Calculations:
i) Solve for Cs:
Cs = Q / [ m ΔT]
ii) Substitute the data:
Cs = 1.24 × 10⁵ J / [ 2kg (1768K - 298K) ] = 421 J / (kg K)
4) Compare with the specific heats (Cs) of the vaious metals given and you find that it is Cobalt.
Explanation:
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