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Find (I) No. of moles of cu atom In 10...

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(I) No. of moles of cu atom In `10^(20)` atoms of cu.
(ii) Mass of 200 atoms in amu.
(iii) Mass of 100 atoms of in amu .
(iv) No. of molecules & atoms in 54 gm `H_(2)O`.
(v) No. of atoms in 88 gm `CO_(2)`.

Text Solution

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The correct Answer is:
`(i)(10^(20))/(N_(A))"moles"" "(ii)3200 "amu"" "(iii)14xx1.66xx10^(-24)100g" "(iv)3N_(a),9N_(9)" "(v)6N_(A)`
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Find : (i) No.of moles in 10^(20) atoms of Cu (ii) Mass of 200_(8)^(16)O atoms in amu (iii) Mass of 100 atoms of _(7).^(14)N in gm (iv) No.of molecules & atoms in 54 gmH_(2)O (v) No.of atoms in 88gmCO_(2) .

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Knowledge Check

  • Number of atoms of He in 100 amu of He is :

    A
    25
    B
    100
    C
    50
    D
    `100 xx 6 xx 10^(-23)`

  • Number of atoms of He in 100 atoms of He (at.mass 4 amu) is

    A
    `100xx6.022xx10^(23)`
    B
    `50`
    C
    `25`
    D
    `100`

  • What is the number of moles of O-atom in 126 amu of HNO_(3) ?

    A
    2
    B
    `(2)/(N_(A))`
    C
    6
    D
    `(6)/(N_(A))`

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