STEM PRACTICE AND EVIDENCE WORKBENCH
Use supplied balanced-equation coefficients to calculate output moles and audit learner mole-ratio reasoning transparently.
Review output
Load the worked example to inspect realistic inputs, or enter anonymous classroom or laboratory evidence. Results remain in this browser tab until you copy or download them.
Transparent method
Mole-ratio scale factor equals output coefficient divided by input coefficient. Expected output moles equal input moles times that scale factor. Compare the learner value with the expected amount using the declared relative percentage tolerance. Coefficients are used only as ratios, so scaling the entire balanced equation by one common factor leaves the result unchanged. Supported means the learner amount follows the supplied coefficient direction. It does not confirm that the equation is balanced or that this product amount will be obtained experimentally. Review formulas, atom and charge balance, reaction direction, limiting and excess reactants, purity, conversion, equilibrium, percent yield, units, significant figures, uncertainty, hazards, and actual laboratory conditions.
Confirm the learning question, authoritative source, units, notation, response coding, model assumptions, and review threshold. Keep an unchanged copy of the original evidence and remove learner names or identifiers.
Run the worked example first, inspect every intermediate row, and compare it with a hand calculation, diagram, representation, or approved subject method. Correct input evidence before interpreting a flag.
Record the method, assumptions, units, classifications, and flagged rows. Verify the editable report independently, connect the numerical signal with learner reasoning, and document any teaching or laboratory decision outside this tool.
How to interpret the result
Use after balancing an equation when learners need to isolate the coefficient ratio from later mass, particle, limiting-reagent, or yield conversions. The report displays the direction and multiplier. It does not balance equations, parse formulas, choose the limiting reagent, infer reaction completion, calculate molar mass, predict actual yield, or decide whether a reaction is feasible or safe.
Reaction A uses two moles of A for three of B, so four moles of A correspond to six of B. Reaction B doubles 0.5 to 1, while Reaction C uses a one-to-four output-to-input ratio and converts eight to two. The final coefficients three to two convert six input moles to four output moles, so learner value nine is flagged.
Mole-ratio scale factor equals output coefficient divided by input coefficient. Expected output moles equal input moles times that scale factor. Compare the learner value with the expected amount using the declared relative percentage tolerance. Coefficients are used only as ratios, so scaling the entire balanced equation by one common factor leaves the result unchanged.
Supported means the learner amount follows the supplied coefficient direction. It does not confirm that the equation is balanced or that this product amount will be obtained experimentally. Review formulas, atom and charge balance, reaction direction, limiting and excess reactants, purity, conversion, equilibrium, percent yield, units, significant figures, uncertainty, hazards, and actual laboratory conditions.
Do not use subscripts as mole coefficients, invert the ratio, add coefficients, convert grams directly with a mole ratio, choose the larger coefficient automatically, ignore the requested species direction, or treat theoretical output as actual yield. Write input units, place the input coefficient where it cancels, show the output coefficient, and estimate whether the magnitude is sensible.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose a learner, certify an experiment, establish assessment validity, or replace teacher, laboratory, curriculum, accessibility, and safety judgment.
Review checklist
Practical questions
No. Processing occurs in the current browser tab. Avoid personal information and retain authoritative records only in the approved school system.
No. It describes entered evidence under one disclosed rule. Review reasoning, uncertainty, access, and several evidence sources.
Treat it as an editable calculation aid. Show your own reasoning, cite required sources, and follow course and academic-integrity rules.
YOUR NIRMION
