STEM PRACTICE AND EVIDENCE WORKBENCH
Convert empirical composition and measured molar mass into a bounded whole-number multiplier and audit molecular formulas.
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
Empirical mass is the sum of atomic mass times empirical count. Raw ratio equals measured molar mass divided by empirical mass. The ratio must fall within the entered percentage tolerance of a positive whole number. Multiply every empirical subscript by that same integer to produce the molecular formula. Supported means both learner multiplier and formula match the bounded calculation. A clean integer does not establish compound identity; agreement depends on empirical composition, molar-mass evidence, atomic-mass convention, and uncertainty. Review whether the ratio is defensible, the formula is reduced only at the empirical stage, and chemistry supports the result.
Confirm the question, source, units, notation, response coding, model assumptions, and review threshold. Keep an unchanged copy of the original evidence.
Run the worked example, inspect every intermediate row, and compare it with a hand calculation, diagram, representation, or approved subject method.
Record the method, assumptions, units, classifications, and flagged rows. Verify the editable report independently before educational or laboratory use.
How to interpret the result
Use after an empirical formula and independent molar-mass estimate are available. The diagnostic exposes empirical mass, raw ratio, selected integer, and scaled formula. It does not derive empirical composition from percentages, identify a compound, correct noisy measurements, parse parentheses, choose a formula convention, or prove chemical plausibility.
The glucose-like empirical unit CH2O has mass near 30.026 and measured mass near 180.156, giving multiplier six and formula C6H12O6. The peroxide-like unit HO gives multiplier two and H2O2. The ethene-like CH2 evidence gives multiplier two, so the entered multiplier one and formula CH2 are flagged.
Empirical mass is the sum of atomic mass times empirical count. Raw ratio equals measured molar mass divided by empirical mass. The ratio must fall within the entered percentage tolerance of a positive whole number. Multiply every empirical subscript by that same integer to produce the molecular formula.
Supported means both learner multiplier and formula match the bounded calculation. A clean integer does not establish compound identity; agreement depends on empirical composition, molar-mass evidence, atomic-mass convention, and uncertainty. Review whether the ratio is defensible, the formula is reduced only at the empirical stage, and chemistry supports the result.
Do not divide empirical mass by measured mass, round a poor ratio aggressively, multiply only one subscript, reduce the molecular formula back to the empirical formula, use mixed units, omit an element, or assume any whole-number ratio proves identity. Retain precision and compare with independent composition and structural evidence.
Learning boundary
This browser-local workbench applies only the disclosed rules. It cannot diagnose a learner, certify an experiment, 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 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
