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Find number of oxygen atoms present in 1...

Find number of oxygen atoms present in `100 mg` of `CaCO_3`. (Atomic mass of Ca = 40 u`, `C = 12 u`,` O = 16 u)

A

`6.02 xx 10^(23)`

B

`6.02 xx 10^(20)`

C

`1.806 xx 10^(21)`

D

`1.204 xx 10^(20)`

Text Solution

Verified by Experts

The correct Answer is:
C
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How many moles of calcium carbonate (CaCO_(3)) are present in 10 g of the substance ? (Ca = 40 u , C = 12 u, O = 16 u)

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Knowledge Check

  • Formula unit mass of K_(2) CO_(3) is (Atomic mass of K = 39 u , C = 12 u and O = 16 u)

    A
    67 u
    B
    138 u
    C
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    D
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  • Number of atoms of He in 100 u of He ( Atomic mass of He is 4 u)

    A
    25
    B
    50
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    100
    D
    400

  • Ninhydrin having molecular formula C_9H_6O_4 , is commonly used by forensic scientists to detect and analyse fingerprints. The number of molecules in 7.4 g of ninhydrin is (Atomic mass of C = 12 u, H = 1 u, O = 16 u)

    A
    `1.5 xx 10^(22)`
    B
    `2.5 xx 10^(23)`
    C
    `2.5 xx 10^(22)`
    D
    `4.2 xx 10^(23)`

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