A mixture of weighing 228 g contain CaCl2 and NaCl . If this mixture is dissolved in 10 kg of water and form ideal solution that boil at 100.364 ℃ The mol % of NaCl in mixture is [ kb of water = 0.52 K per mol Kg]

Given that 228 g mixture of NaCl and CaCl₂ consider that “x” g NaCl and (228-x) gm CaCl₂ present in this mixture:

NaCl and CaCl₂ both are strong electrolytes hence Vant’s Hoff factor are 2 and 3 respectively.

Moles of NaCl = x/58.5

Moles of CaCl₂ = 228-x

And hence molality of NaCl and CaCl₂ are 

Molality of NaCl = ×/58.5×10kg

Molality of CaCl2= 228-x/111×10kg

We know that 

∆Tb = i₁m₁+i₂m₂

100.364= 2(×/58.5×10kg) +3(228-x/111×10kg)

On solving we got x= 117 g 

Moles of NaCl= 117/58.5 =2

Moles of CaCl2= 111/111=1

Mole percentage (%) 0f NaCl = (2/2+1)x100= 66.67%

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What is fractional presence of Fe+2 in Fe0.94 O1.0 ?

Fe0.94 O 1.0 is non stachiometric compound hence Nickel contains both Fe+2 and Fe+3 .

We can calculate ℅  presence of Fe+2  and Fe+3 by oxidation method.

(F+2+Fe+3) O1.O

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What are coordination number (nearest neighbour) in a FCC at distance of (a/√2) and next nearest neighbour at distance (a) and next to next nearest neighbour at distance (a√3/√2) ?.

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What are coordination number (nearest neighbour) in a BCC at distance of (a√3/2) and next nearest neighbour at distance (a) and next to next nearest neighbour at distance (a√2) ?.

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(2) The next nearest neighbour are 6 at distance (a)Lattice parameter.

(3) 3^rd neighbour (Next to Next nearest neighbour) are(12) at distance (a root 2) ( All corner along face diagonal in x,y and Z plane).

What are coordination number (nearest neighbour) in a SCC at distance of it lattice parameter (a) and next nearest neighbour at distance (a√2) and next to next nearest neighbour at distance (a√3) ?.

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(1) The nearest neighbour distance is just the lattice parameter (a) therefore coordination number for a given atom in SCC unit cell is 6 (six).

(2) The next nearest neighbour are 12 at distancea/root 2 (each face diagonal in x ,y and Z plane).

(3) 3^rd neighbour (Next to Next nearest neighbour) are(8) at distance a root 3 (each corner along body diagonal.