A regular cube of metal measures exactly 10 cm on an edge and has density 8 g / cc . If the cube contains 6 × 1 0 25 atoms of the metal, determine atomic weight of metal? (take N A = 6 × 1 0 23 )

Question

A regular cube of metal measures exactly 10 cm on an edge and has density 8 g / cc . If the cube contains 6 × 1 0 25 atoms of the metal, determine atomic weight of metal? (take N A ​ = 6 × 1 0 23 )

TestHub · Accepted Answer

Explain the question: Find atomic weight of a metal.

Concept: This question is based on Mole Concept & Density Formula

Solution: Volume of cube $= 10 \times 10 \times 10 = 1000 cm^{3}$

Mass of cube $= 8 \times 1000 = 8000 gm$

$=$ moles of total $= \frac{6 \times 1 0 ^{25}}{6 \times 1 0 ^{23}} = 100$ moles

Moles of Metal $= \frac{8000}{atomic weight} = 100$

atomic weight $= 80$

Final Answer: The correct option is (C)

Chemistry - Mole Concept Question with Solution | TestHub

Options:

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