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Chemistry - Solid State Question with Solution | TestHub

ChemistrySolid StateMiscellaneous/MixedEasy2 minPYQ_2020

ChemistryEasysingle choice

How many unit cells are present in a cube shaped ideal crystal of $N a C l$ of mass $1 .00 g$ ?

$[Atomic mass : N a = 23, C l = 35.5]$

Options:

Answer:

Solution:

Mass of one unit-cell $(m)$ = volume $\times$ density

$= a^{3} \times d = a^{3} \times \frac{M Z}{N_{0} a^{3}} = \frac{M Z}{N_{0}}$

$m = \frac{58.5 \times 4}{6.02 \times 10^{23}} g$

$∴$ Number of unit cells in $1 g$ $= \frac{1}{m}$

$= \frac{{6.02 \times 10}^{23}}{58.5 \times 4}$

$= 2.57 \times 10^{21}$

Stream:NTA_ABHYAS_NEETSubject:ChemistryTopic:Solid StateSubtopic:Miscellaneous/Mixed

⏱ 2mℹ️ Source: PYQ_2020

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