(a) Explanation The ratio of carbon atoms to hydrogen atoms in C 2 H 4 is 2 : 4 that can be reduced to 1 : 2 . Write the simplest ratio of carbon and hydrogen as the subscripts after the symbol of the element to obtain the empirical formula. Therefore, the empirical formula is CH 2 . The expression to calculate the empirical formula mass of CH 2 is as follows: Empirical formula mass of CH 2 = ( 1 ) ( M of C ) + ( 2 ) ( M of H ) (1) Substitute 12 (b) Interpretation Introduction Interpretation: The empirical formula and empirical formula mass for C 2 H 6 O 2 are to be determined. Concept introduction: An empirical formula gives the simplest whole number ratio of atoms of each element present in a compound. Following are the steps to calculate the empirical formula mass of a compound. Step 1: Determine the number of atoms of each element from the given formula. Step 2: Divide the atom numbers of each element by a common factor to obtain the lowest whole number values. Write the lowest whole number value as the subscript of the element’s symbol to obtain the empirical formula for the compound. Step 3: Add the molar mass of each element multiplied by its number of atoms present in the empirical formula to obtain the empirical formula mass for the compound (c) Interpretation Introduction Interpretation: The empirical formula and empirical formula mass for N 2 O 5 are to be determined. Concept introduction: An empirical formula gives the simplest whole number ratio of atoms of each element present in a compound. Following are the steps to calculate the empirical formula mass of a compound. Step 1: Determine the number of atoms of each element from the given formula. Step 2: Divide the atom numbers of each element by a common factor to obtain the lowest whole number values. Write the lowest whole number value as the subscript of the element’s symbol to obtain the empirical formula for the compound. Step 3: Add the molar mass of each element multiplied by its number of atoms present in the empirical formula to obtain the empirical formula mass for the compound (d) Interpretation Introduction Interpretation: The empirical formula and empirical formula mass for Ba 3 ( PO 4 ) 2 are to be determined. Concept introduction: An empirical formula gives the simplest whole number ratio of atoms of each element present in a compound. Following are the steps to calculate the empirical formula mass of a compound. Step 1: Determine the number of atoms of each element from the given formula. Step 2: Divide the atom numbers of each element by a common factor to obtain the lowest whole number values. Write the lowest whole number value as the subscript of the element’s symbol to obtain the empirical formula for the compound. Step 3: Add the molar mass of each element multiplied by its number of atoms present in the empirical formula to obtain the empirical formula mass for the compound (e) Interpretation Introduction Interpretation: The empirical formula and empirical formula mass for Te 4 I 16 are to be determined. Concept introduction: An empirical formula gives the simplest whole number ratio of atoms of each element present in a compound. Following are the steps to calculate the empirical formula mass of a compound. Step 1: Determine the number of atoms of each element from the given formula. Step 2: Divide the atom numbers of each element by a common factor to obtain the lowest whole number values. Write the lowest whole number value as the subscript of the element’s symbol to obtain the empirical formula for the compound. Step 3: Add the molar mass of each element multiplied by its number of atoms present in the empirical formula to obtain the empirical formula mass for the compound

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ISBN: 9781266207631

Author: SILBERBERG

Publisher: MCG

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can b…

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