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From the subscripts from the super scripts from the coefficients none of the above. 1. See answer. allisonalmazan4 is waiting for your help. Why join Brainly? ask questions about your assignment. get answers with explanations. find similar questions. I want a free account.The mole concept is a convenient method of expressing the amount of a substance. Any measurement can be broken down into two parts - the numerical magnitude and the units that the magnitude is expressed in. For example, when the mass of a ball is measured to be 2 kilograms...Answer: 45.0 g conc.HNO3. 12 25.3 g of Sodium carbonate Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ion, Na+ and carbonate ion CO2−3 are respectively (Molar mass of Na2CO3 = 106 g mol-1) A 0.955 M and 1.910 M.