# Quantitative And Quantitative Analysis On Chemical Reactions

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a) The main topics studied during the unit Quantities in Chemical Reactions were separated into two sections: Quantities in Chemical Formulas and Stoichiometry in Chemical Reactions. The first section involved qualitative and quantitative analysis, using the mole as a unit of calculation, calculating mass, molar mass and number of entities, calculating percentage composition and dealing with empirical and molecular formulas. The second section of the unit involved, mole ratios and mass relationships in chemical equations, determining limiting reagents and calculating percentage yield. Qualitative and quantitative analysis laid down an important base for the studies of this unit. These concepts allow chemists to make critical…show more content…
The empirical formula is a formula that shows the simplest whole-number ratio of elements in a compound. The empirical formula, along with the molar mass of the compound could in turn be used to determine the molecular formula of a compound. The molecular formula shows the exact number of each type of atom present in one molecule of a compound. In the second section of the unit, the principles and applications of stoichiometry were studied. Stoichiometry utilizes the ratios between reactants and products of a chemical equation to predict amounts of products and reactants, given one or more values. First, it was studied how to make calculations of moles and masses of specific substances in chemical reactions. These same principles can be used to determine limiting reagents. It is important to understand how one reactant can be limiting for environmental and economical reasons. A company reacting precious metals would want to have the metal as the limiting reagent, as to not waste any of the more expensive material. From an environmental standpoint, if one was to neutralize an acid spill in a lake, he or she should use a stoichiometric amount of base as to assure that excess base will not cause the lake water to become overly basic. Finally, the calculation of percentage yield was studies. This is the comparison between the theoretical yield and the actual yield. Percentage yield can