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Number of atoms in 12 g of ""(12)^(24)M...

Number of atoms in 12 g of `""_(12)^(24)Mg` is equal to

A

oxygen atoms in 11 g `CO_(2)`

B

hydrogen atoms in 4g `CH_(4)`

C

nitrogen atom in 46 g `N_(2)O_(4)`

D

sulphur atom in 79 g `Na_(2)S_(2)O_(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
12 g of `._(12)^(24)Mg`(0.5 mol) contains atoms
`= 3.01xx10^(23)`
(A) 11 g of `CO_(2)`(0.25 mol) contains oxygen atom
`= 0.50 mol`
`=3.01xx10^(23)` atoms
(B) 4 g of `CH_(4)`(0.25 mol) contain hydrogen atoms
`= 1 mol = 6.02xx10^(23)`atoms
(C) 46 g of `N_(2)O_(4)`(0.5 mol) contains sulphur atoms
`=2 mol = 2xx6.02xx10^(23)` atoms
(D) 79 g of `Na_(2)S_(2)O_(3)` (0.5 mol) contains sulphur atoms = 1 mol = `6.02xx10^(23)` atom
(Molar mass of `CO_(2), CH_(4), N_(2)O_(4)` and `N_(2)S_(2)O_(3)` are 44, 16, 92 and `158 g mol^(-1)`
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Knowledge Check

  • Number of atoms in 12 g of ""_(6)^(12) C is :

    A
    6
    B
    12
    C
    `6.022 xx 10^(23)`
    D
    `12 xx 6.022 xx 10^(23)`

  • {:(,"List-I",,"List-II"),("(P)","Mass of one atom of C",(1),12xxN_(A)),("(Q)","Number of atoms in 144 g C",(2),12//N_(A)),("(R)","24 g of magnesium",(3),1//N_(A)),("(S)","1 atomic mass unit",(4),N_(A)):}

    A
    P-3, Q-2, R-4, S-1
    B
    P-4, Q-3, R-1, S-2
    C
    P-2, Q-1, R-3, S-4
    D
    P-2, Q-1, R-4, S-3

  • If 12 gram of carbon has x atoms, then the number of atoms in 12 grams of magnesium will be :

    A
    x
    B
    2x
    C
    `x/2`
    D
    `1.5 x`

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