CHEM 2090 Lecture Notes - Lecture 2: Limiting Reagent, Chemical Formula, Molecular Mass

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28 Nov 2016

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Document Summary

The mole: one of the most important concepts in chemistry. The quantity of a substance that is equal to its formula mass in grams is called a mole. The molar mass of a compound is the number of grams needed to make up a mole of the compound. Stoichiometry: the calculation of the quantities of elements or compounds involved in chemical reactions. We can use stoichiometry to determine the empirical formula of a compound. An empirical formula tells you the ratio of the constituent elements. The molecular formula can be an integral multiplier of the empirical formula. However, in order to determine the molecular formula, we will need more info, such as the molar mass. Limiting reactant: when two or more substances react, the mass of the product is determined by the limiting reactant (the reactant that is completely consumed) To determine limiting reactant: find the number of moles of reactants and look at the stoichiometric coefficients.

Related Questions

A 16.43 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 16.06 grams of CO₂ and 3.288 grams of H₂O are produced.

In a separate experiment, the molar mass is found to be 90.04 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

Enter the elements in the order C, H, O

empirical formula =

molecular formula =

A 5.433 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 9.682 grams of CO₂ and 3.964 grams of H₂O are produced.

In a separate experiment, the molar mass is found to be 74.08 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

Enter the elements in the order C, H, O

empirical formula =

molecular formula =