is a comparison between the actual yield and the theoretical yield and is defined as percent yield = actual yield theoretical yield × 1 00 % The percent yield Actual yield divided by theoretical yield times 100% to give a percentage between 0% and 100%. It is also common to see something called a percent yield. If it is not, then an error has been made.īoth theoretical yields and actual yields are expressed in units of moles or grams. By definition, the actual yield is less than or equal to the theoretical yield. The amount that is actually produced in a reaction is called the actual yield The amount that is actually produced in a chemical reaction. In many cases, less-sometimes much less-of a product is made during the course of a chemical reaction. In many cases, however, this is not what really happens. When we calculate an amount of product assuming that all the reactant reacts, we calculate the theoretical yield An amount that is theoretically produced as calculated using the balanced chemical reaction., an amount that is theoretically produced as calculated using the balanced chemical reaction.

Many chemical reactions do not proceed to completion as written, for a variety of reasons (some of which we will consider in Chapter 13 'Chemical Equilibrium'). The second assumption, that the reaction proceeds completely, is more troublesome.

However, we will continue to ignore side reactions, unless otherwise noted. For example, in the actual combustion of some carbon-containing compounds, such as methane, some CO is produced as well as CO 2. In reality, such things as side reactions occur that make some chemical reactions rather messy. In all the previous calculations we have performed involving balanced chemical equations, we made two assumptions: (1) the reaction goes exactly as written, and (2) the reaction proceeds completely.

Define and determine theoretical yields, actual yields, and percent yields.

Yield chemistry calculator