a. Consider the following chemical equation: HNO3 + pFeCl2 + qHCl → rFeCl3 + NO + 2H2O Which of the following combinations is correct?           p     q     r A.      3     2     1 B.      3    3      3 C.      1    2     3 D.      1    2     1 b. Which of the following pairs can represent the respective empirical formula and molecular formula of a certain  compound? A. CH and CH4 B. CH and C6H6 C. CH2 and C2H2 D. CH3 and C3H6

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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 be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.