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30 July, 16:24

How many atoms of hydrogen are in 2.50g of water

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  1. 30 July, 16:42
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    1.67 * 10²³ atoms of hydrogen present in 2.5 g of water.

    Explanation:

    Given dа ta:

    Mass of water = 2.5 g

    Number of hydrogen atoms=?

    Solution:

    First of all we will calculate the molar mass of water.

    Molar mass of H₂O = 16 + 1 * 2 = 18 g/mol

    The number of atoms will be determine through the Avogadro number.

    The number 6.022*10²³ is called Avogadro number and it is the number of atoms or molecules in one gram of atoms of an element or one gram molecules of a compound.

    First of all we will calculate the number of moles of water in 2.5 g.

    Number of moles = mass / molar mass

    Number of moles = 2.5 g / 18 g/mol

    Number of moles = 0.139 mol

    The number of molecules of water in 10 g.

    0.139 * 6.022*10²³ = 0.837 * 10²³molecules

    one water molecule contain two hydrogen atoms. For 0.837*10²³ molecules,

    0.837*10²³ * 2 = 1.67 * 10²³ atoms
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