The combustion analysis calculator turns carbon dioxide (co₂) mass, water (h₂o) mass, sample compound’s mass into mass of hydrogen (h), mass of carbon (c), mass of oxygen (o). It suits students checking a worked example, professionals sanity-checking a figure, and anyone who wants to see how the pieces of the calculation fit together.
What Is the Combustion Analysis Calculator?
It is built around mass of hydrogen (h), mass of carbon (c), mass of oxygen (o), and it works the same way whether you are checking a homework answer, confirming a colleague's figure, or working something out for yourself. Everything runs in your browser, so nothing you enter is uploaded anywhere.
How the Combustion Analysis Calculation Works
Nothing is hidden: each output is worked out from the values above it, which makes it easy to see where a surprising answer came from.
The relationship between carbon dioxide (co₂) mass, water (h₂o) mass, sample compound's mass and mass of hydrogen (h), mass of carbon (c), mass of oxygen (o) is fixed, so the same figures always give the same answer. That makes it a good cross-check: run the numbers a second way and see whether the result agrees.
Getting a Result You Can Trust
The most common mistake is mixing units. Keep carbon dioxide (co₂) mass and water (h₂o) mass and sample compound's mass in the same system throughout, and make sure any rates or ratios are quoted per the same period. When a result looks far out of range, the units are nearly always the reason.
Frequently Asked Questions
What do I need to work out mass of hydrogen (h)?
Enter carbon dioxide (co₂) mass, water (h₂o) mass, sample compound's mass. The calculator then works through the relationship and reports mass of hydrogen (h), mass of carbon (c), mass of oxygen (o).
What does the combustion analysis actually calculate?
It takes carbon dioxide (co₂) mass and water (h₂o) mass and sample compound's mass and converts them into mass of hydrogen (h), mass of carbon (c), mass of oxygen (o) using the standard relationship for this problem. Each step is applied in turn, so every output is traceable back to the numbers you typed in.
How should I enter carbon dioxide (co₂) mass?
Use the value you actually have, in the unit shown next to the field. Enter every value in the same unit system. The calculator assumes the figures you supply are consistent, so it cannot correct a mistake that happens before the calculation starts.
Why does a small change in one value move the answer so much?
That happens when an output depends on a ratio, because dividing by a small number magnifies any change in it. Check the units first, then check whether the value you entered is in the range the relationship was designed for.
Can I use this for a quick estimate as well as a precise answer?
Yes. The calculator is built for quick checks, so round your inputs to a sensible number of significant figures and the result will be just as useful. If you need more precision, keep the same method and add digits to the inputs rather than adjusting the method itself.