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Some Basic Concepts of Chemistry question

2024 · 30 Jan · Shift 1 · Q23
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Some Basic Concepts of Chemistry question

2024 · 30 Jan · Shift 1 · Q23

JEE MainChemistrySome Basic Concepts of ChemistryNumerical+4 / −1
0.05 cm0.05 \mathrm{~cm}0.05 cm thick coating of silver is deposited on a plate of 0.05 m20.05 \mathrm{~m}^20.05 m2 area. The number of silver atoms deposited on plate are ‾\underline{\hspace{2cm}}​×1023\times 10^{23}×1023. (At mass Ag=108, d=7.9 g cm−3\mathrm{Ag}=108, \mathrm{~d}=7.9 \mathrm{~g} \mathrm{~cm}^{-3}Ag=108, d=7.9 g cm−3)
Numerical answer
View written solutionFree

Correct answer: 11

  1. Given data

    • Thickness of silver coating: 0.05 cm0.05\,\text{cm}0.05cm
    • Area of plate: 0.05 m20.05\,\text{m}^20.05m2
    • Density of silver: 7.9 g cm−37.9\,\text{g cm}^{-3}7.9g cm−3
    • Atomic mass of silver: 108 g mol−1108\,\text{g mol}^{-1}108g mol−1
  2. Convert area into cm2\text{cm}^2cm2 Since 1 m2=104 cm21\,\text{m}^2 = 10^4\,\text{cm}^21m2=104cm2, 0.05 m2=0.05×104=500 cm20.05\,\text{m}^2 = 0.05 \times 10^4 = 500\,\text{cm}^20.05m2=0.05×104=500cm2

  3. Find volume of silver deposited Volume=area×thickness\text{Volume} = \text{area} \times \text{thickness}Volume=area×thickness V=500×0.05=25 cm3V = 500 \times 0.05 = 25\,\text{cm}^3V=500×0.05=25cm3

  4. Find mass of silver deposited Using mass=ρV\text{mass} = \rho Vmass=ρV, m=7.9×25=197.5 gm = 7.9 \times 25 = 197.5\,\text{g}m=7.9×25=197.5g

  5. Find moles of silver n=197.5108≈1.83 moln = \frac{197.5}{108} \approx 1.83\,\text{mol}n=108197.5​≈1.83mol

  6. Find number of atoms N=nNA=1.83×6.022×1023N = nN_A = 1.83 \times 6.022 \times 10^{23}N=nNA​=1.83×6.022×1023 N≈11.0×1023N \approx 11.0 \times 10^{23}N≈11.0×1023

  7. Final answer The number of silver atoms deposited is 11×1023\boxed{11 \times 10^{23}}11×1023​ So the required integer is: 11\boxed{11}11​

  8. Comparison with stored answer Stored correct answer = 111111

    Our derived answer = 111111

    Hence, the answer matches the stored correct answer.

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