Question

The atomic radius of a strontium is 215 pm and it crystallizes with cubic closed packing. Edge length of the cube is

Answer 1

Answer:

Explanation:Answer : 2.586gcm−3

The cubical closest-packed structure has a face-centred cubic unit cell.In the latter atoms touch along the face diagonal of the cube.Hence

2–√a=4r=4(215pm)=860pm or a=860pm2–√=608.2pm

Now using the expression

ρ=Na3(MNA)

We get ρ=4(608.2×10−12m)3(87.6gmol−16.023×1023mol−1)=2.586×106gm−3≡2.586gcm−3.

Answer 2

Answer:

Ans is 2.586gram

Explanation:

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