STEM REASONING AND EVIDENCE WORKBENCH
Aggregate entered elemental contributions into compound molar masses and audit verified and learner totals.
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
For each compound label, molar mass equals the sum over elements of atom count multiplied by the supplied atomic mass. Full-precision contributions are accumulated before display. Calculated totals are compared independently with the verified and learner values using an absolute 0.005 unit tolerance. A learner match supports the arithmetic for the supplied counts and atomic masses. A verified-value conflict identifies a possible answer-key or input issue rather than silently grading against it. Ask learners to annotate the formula, preserve parentheses and subscripts, show each contribution, and explain the mole basis.
Confirm the question, approved source, units, notation, signs, response coding, model assumptions, and review threshold. Keep an unchanged copy of measurements or learner evidence.
Run the worked example, inspect every intermediate row, and compare the result with a hand calculation, diagram, representation, periodic table, or approved laboratory method.
Record the method, assumptions, uncertainty, units, classifications, and flagged rows. Verify the editable report independently before instruction, assessment, or laboratory use.
How to interpret the result
Use after a chemical formula has already been interpreted into element counts. The tool groups explicit rows and exposes each count-times-mass contribution. It does not parse formulas, parentheses, hydrates, isotopes, names, or charge; choose atomic masses; establish the correct formula; or convert between mass and moles.
Two water rows sum two hydrogen contributions and one oxygen contribution to 18.015 g/mol. Carbon dioxide sums to 44.009 while a learner total of 40 is flagged. Calcium chloride combines one calcium and two chlorine atoms and matches a rounded 110.98 learner result within the disclosed tolerance.
For each compound label, molar mass equals the sum over elements of atom count multiplied by the supplied atomic mass. Full-precision contributions are accumulated before display. Calculated totals are compared independently with the verified and learner values using an absolute 0.005 unit tolerance.
A learner match supports the arithmetic for the supplied counts and atomic masses. A verified-value conflict identifies a possible answer-key or input issue rather than silently grading against it. Ask learners to annotate the formula, preserve parentheses and subscripts, show each contribution, and explain the mole basis.
Do not add atomic numbers, ignore subscripts outside parentheses, multiply every element by the same count, round each contribution early, confuse formula-unit mass with sample mass, or mix atomic-mass tables. Verify the formula and isotopic basis first, then retain units and reasonable precision.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose a learner, certify an experiment, establish a chemical structure, or replace teacher, laboratory, 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 school-approved system.
No. It describes entered evidence under one disclosed rule. Compare several evidence sources and ask for reasoning before drawing a conclusion.
Treat it as an editable calculation aid. Show your own reasoning, cite required sources, and follow the course method and academic-integrity rules.
YOUR NIRMION
