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Find the total negative or positive char...

Find the total negative or positive charge on a 2 g silver coin. The atomic number and atomic mass of silver is 47 and 107.9 u respectively, Given: Avogadro's number is `6.023 xx 10^23 g^(-1) "mol"^(-1)` .

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`pm 84.2xx10^3` C
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How many g atoms and number of atoms are there n (a) 60 g carbon, (b) 22.4 g Cu , an (c ) 72.52 g lead. Given atomic masses of C, Cu and Pb are 12,63.6, and 207.2, respectively. (Avogadro's number = 6.02 xx 10^(23)) .

Knowledge Check

  • If one million atoms of silver weight 1.79xx10^(-16)gm the gram atomic mass of silver is:

    A
    107 g/mol
    B
    107.2 g/mol
    C
    107.8 g/mol
    D
    108.2 g/mol

  • Calculate the total positive (or negative) charge on a 3.11 g copper penny. Given Avogadro's number =6.023xx10^(23)(g^(-1)) mol^(-1), , Given Avogadro's number and atomic mass=63.5.

    A
    `1.37xx10^(7) C`
    B
    `2.5xx10^(5) C`
    C
    `1.37xx10^(5) C`
    D
    `2.5xx10^(7) C`

  • Assertion: Both 12 g . of carbon and 27 g . of aluminium will have 6.02xx10^(23) atoms. Reason: Gram atomic mass of an element contains Avogadro's number of atoms.

    A
    (a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    (b)If both assertion and reason are true and the reason is not the correct explanation of the assertion.
    C
    (c )If assertion is true but reason is false.
    D
    (d)If assertion is false but reason is true.

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    Find the number of electrons present in an 8-g gold pin . Given : Molar mass of gold =197 g/mol , electron per atom is gold =79 and Avogadro's number =6.023xx10^23 g^(-1) mol^(-1)

    Find the half life of U^(238) , if one gram of it emits 1.24xx10^4 alpha -particle per second. Avogadro's Number =6.023xx10^(23) .

    One million of silver atoms weigh 1.79 xx 10^(-16)g . Calculate the atomic mass of silver.

    Estimate the number of free electrons in 36g of water and the negative charge possessed by them. Given : Avogadro's number = 6.023xx10^(23) and molecular weight of water = 18.

    Find the half-life of uranium, given that 3.32 xx 10^(7) g radium is found per gram of uranium in old minerals. The atomic weights of uranium and radium are 238 and 226 and half-life of radium is 1600 years (Avogadro number is 6.023 xx 10^(23)//g -"atom" ).

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