Percent Yield Worksheets

This worksheet is a set of 15 percent yield practice problems written in the plain-text style of a classroom handout: each problem states its given values directly, and the working space is left blank for you to fill in on paper. It is different from the worked examples page, which walks through the full calculation for each scenario line by line, and from the practice problems page, where each card has a toggle you click to reveal a step-by-step solution. This page gives you the raw numbers up front and nothing else until you reach the answer key at the end, which is closer to how percent yield is usually assigned as homework or handed out before an exam.

All 15 problems rely on the same relationship covered on the percent yield formula page: percent yield equals actual yield divided by theoretical yield, multiplied by 100. Some problems ask you to solve for percent yield directly. Others ask you to rearrange the formula to solve for actual yield or theoretical yield instead. The later problems add a calculation step before the formula can even be applied, such as a mass-to-mole conversion, a mole-ratio comparison, a limiting reagent check, or balancing an equation that is given unbalanced.

The worksheet is split into three tiers of five problems each, arranged from simplest to most demanding. The table below summarizes what each tier tests and roughly how much setup work is needed before the percent yield formula is applied.

Foundation problems are meant for a first pass through the formula itself. Every value you need is already in matching units, so the task is choosing the correct rearrangement of the percent yield equation and plugging in carefully. Intermediate problems add one realistic complication, such as reporting the actual yield in moles instead of grams, describing a reaction in terms of a 1:1 mole ratio, or stating the theoretical yield in kilograms while the actual yield is given in grams. Challenge problems combine multiple steps in the order a real lab report would require them: figuring out which reactant runs out first, carrying a result through two reaction steps, or balancing a chemical equation before any stoichiometry can be done at all.

Attempt every problem before looking at the answer key, even the ones that look easy. Percent yield problems are graded on process as much as on the final number, and skipping ahead to the key teaches you to recognize an answer rather than to produce one. Work each problem on paper with your units labeled at every step, since the most common point of failure in this topic is not the formula itself but a mismatched unit, a forgotten mole conversion, or a mixed-up reactant when two starting materials are given.

If a problem comes out wrong, resist the urge to just read the correct answer and move on. Re-derive the problem from scratch instead: rewrite the given values, reconfirm which quantity is being solved for, and redo the arithmetic before checking again. This catches the specific step where the error happened, which is usually more useful than the answer itself. Once you have a number you are confident in, use the percent yield calculator to check your working method rather than only your final digit. If the calculator's result matches yours but your intermediate steps do not match what it implies, that mismatch is worth tracking down before you move to the next problem.

This page is formatted to print cleanly on standard paper for classroom handouts or self-study sessions. The 15 problems are laid out in their three tiers first, followed by the answer key as a separate block at the end, rather than interleaving answers next to each problem. That separation matters if a teacher wants to hand out only the problem set and hold back the key until class review, or if a student wants to fold the page so the answers are hidden during a timed practice run.

Because the answer key is a flat list of final numbers with no step-by-step work shown, it can be photocopied or trimmed separately from the problem sheet without losing any of the questions. If you need to see the full reasoning behind a similar calculation instead of just a final answer, the worked examples page and the practice problems page both show complete step-by-step solutions for comparable problems, and are a better starting point than this worksheet if you are learning the method for the first time.

A blank page also gives you room to show your own reasoning the way an instructor would grade it: labeled given values, a clear formula rearrangement, and a final boxed answer with correct units. Writing the work out fully, even for the Foundation tier, builds the habit that pays off once the problems reach the Challenge tier, where several intermediate quantities have to be tracked at once before the last calculation is even possible.

Percent yield compares what you actually collected from a reaction to what the balanced equation predicts you should collect. The theoretical yield is calculated from stoichiometry, assuming the limiting reactant converts completely with no losses, while the actual yield is the mass or amount actually measured after the reaction and any purification. Dividing actual by theoretical and multiplying by 100 gives the percent yield, and a full breakdown of this relationship, including common unit pitfalls, is on the formula page.

Several Intermediate and Challenge problems on this worksheet also require identifying a limiting reagent, converting between mass and moles, or balancing an equation before percent yield can be calculated at all. If any of those steps feel unfamiliar, review them on the chemistry guide before attempting the later tiers, since the worksheet assumes you already know how to convert grams to moles and how to compare mole ratios between two reactants.

Limiting reagent problems in particular trip up students who otherwise understand the percent yield formula, because the theoretical yield has to be based on whichever reactant runs out first, not on whatever reactant happens to be listed first in the problem. Before starting the Challenge tier, convert each given mass to moles, compare each mole amount to what the balanced equation requires, and confirm which reactant is actually limiting before calculating any theoretical yield.

Once you have checked your 15 answers against the key, the next useful step depends on how many you got right on the first attempt. If most of your answers matched, try the practice problems page, which covers similar problem types with toggle-open solutions so you can check your reasoning one step at a time instead of only the final number. If several answers did not match, or a whole tier felt unfamiliar, work through the worked examples page first, since it explains the full calculation for each type of problem before you attempt more practice on your own.

For a refresher on the underlying relationship before your next attempt, the percent yield formula page covers the equation and its two common rearrangements, and the chemistry guide covers the surrounding concepts, including limiting reagents and mole conversions, in more depth than this worksheet's problems alone can teach.