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13 November, 15:46

Write the formula of each compound, and determine its molecular (formula) mass: (a) sodium dichromate; (b) ammonium Perchlorate; (c) magnesium nitrite trihydrate.

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  1. 13 November, 19:15
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    (a) Na₂Cr₂O₇, 262 g/mol

    (b) NH₄ClO₄, 117.5 g/mol

    (c) Mg (NO₂) ₂.3H₂O, 170.3 g/mol

    Explanation:

    (a) Sodium dichromate

    The formula for the compound is: Na₂Cr₂O₇

    Calculation of the molecular mass as:

    Molar mass of sodium = 23 g/mol

    Molar mass of chromium = 52 g/mol

    Molar mass of oxygen = 16 g/mol

    So, Molecular mass of sodium dichromate = (23*2) + (52*2) + (16*7) = 262 g/mol

    (b) ammonium Perchlorate

    The formula for the compound is: NH₄ClO₄

    Calculation of the molecular mass as:

    Molar mass of nitrogen = 14 g/mol

    Molar mass of hydrogen = 1 g/mol

    Molar mass of chlorine = 35.5 g/mol

    Molar mass of oxygen = 16 g/mol

    So, Molecular mass of ammonium Perchlorate = (14*1) + (1*4) + (35.5*1) + (16*4) = 117.5 g/mol

    (c) magnesium nitrite trihydrate

    The formula for the compound is: Mg (NO₂) ₂.3H₂O

    Calculation of the molecular mass as:

    Molar mass of Magnesium = 24.3 g/mol

    Molar mass of nitrogen = 14 g/mol

    Molar mass of hydrogen = 1 g/mol

    Molar mass of oxygen = 16 g/mol

    So, Molecular mass of magnesium nitrite trihydrate = (24.3*1) + (14*2) + (16*7) + (1*6) = 170.3 g/mol
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