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22 January, 06:00

Calculate the number of moles in 8.00 g of He

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  1. 22 January, 06:22
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    2 moles

    Explanation:

    Mole:

    Mole is the unit of amount in chemistry. It is SI unit and represented by "mol".

    Example:

    one mole of hydrogen has a mass of 1.008 g and contain 6.022 * 10∧23 atoms.

    Steps to find the number of moles:

    1. If the number of grams are given then to find out the moles first of all we will find the molar mass of given chemical substance.

    For example:

    If the given chemical substance is NaOH then its molecular weight is determine through following way:

    atomic mass of Na = 1*22.989 g/mol

    +

    atomic mass of oxygen = 1*16 g/mol

    +

    atomic mass of hydrogen = 1 * 1.008 g/mol

    molecular mass of NaOH = 39.97 or 40 g/mol

    2. when the molar mass and grams are known then number of moles are determine through following formula:

    number of moles = mass in gram / molar mass (g/mol)

    Given dа ta:

    Now we will put the values in formula,

    number of moles = 8.00g/4 g/mol

    number of moles = 2 mol
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