Convert Moles per Hour to Moles per Second
Mole per Hour (mol/h) to Mole per Second (mol/s) molar flow rate conversion — enter any value below to get an instant result, or use the table for common values.
Results from this calculator are estimates provided for general informational purposes only, based on formulas, rates, and standards commonly accepted as of 2026. Figures may differ slightly from other calculators or professional sources due to rounding methods, differing assumptions, or regional regulations, and rules may change over time. Always consult a qualified professional — such as a financial advisor, healthcare provider, or other relevant specialist — before making decisions based on these results.
Result
1 mol/h = 0.0002777778 mol/s
1 Mole per Hour = 0.0002777778 Moles per Second
1 Mole per Second = 3599.9997 Moles per Hour
1 mol/h in every supported unit
Conversion chart: Mole per Hour to Moles per Second
Conversion table
| Mole per Hour (mol/h) | Mole per Second (mol/s) |
|---|---|
| 0.01 mol/h | 2.77778E-06 mol/s |
| 0.1 mol/h | 2.77778E-05 mol/s |
| 1 mol/h | 0.0002777778 mol/s |
| 2 mol/h | 0.0005555556 mol/s |
| 3 mol/h | 0.0008333334 mol/s |
| 5 mol/h | 0.001388889 mol/s |
| 10 mol/h | 0.002777778 mol/s |
| 20 mol/h | 0.005555556 mol/s |
| 50 mol/h | 0.01388889 mol/s |
| 100 mol/h | 0.02777778 mol/s |
| 1000 mol/h | 0.2777778 mol/s |
Mole per Hour (mol/h)
Definition: A molar flow unit for moles passing a point per hour, sized for small continuous laboratory or benchtop reactor feeds.
History: Grew out of laboratory practice, where slow, controlled reagent feed rates are naturally reported on an hourly basis to match experiment duration.
Current use: Used to specify small reagent or catalyst feed rates in laboratory-scale continuous stirred-tank reactors and flow chemistry setups.
Mole per Second (mol/s)
Definition: The SI-coherent base unit of molar flow rate — one mole of substance (6.02214076×10²³ elementary entities) passing a given point every second.
History: Derived directly once the mole was adopted as an SI base unit in 1971, giving chemical engineers and reaction scientists a rate unit built on the same amount-of-substance foundation as stoichiometric calculations.
Current use: The reference unit for molar flow rate in chemical engineering process design, reactor sizing, and gas-phase reaction kinetics worldwide.
Supported Units
| Unit | Symbol | In mol/s |
|---|---|---|
| Mole per Second | mol/s | 1 mol/s |
| Kilomole per Second | kmol/s | 1000 mol/s |
| Kilomole per Minute | kmol/min | 16.666667 mol/s |
| Kilomole per Hour | kmol/h | 0.27777778 mol/s |
| Kilomole per Day | kmol/d | 0.011574074 mol/s |
| Mole per Minute | mol/min | 0.016666667 mol/s |
| Mole per Hour | mol/h | 0.0002777778 mol/s |
| Mole per Day | mol/d | 1.15741E-05 mol/s |
| Millimole per Second | mmol/s | 0.001 mol/s |
| Millimole per Minute | mmol/min | 1.66667E-05 mol/s |
| Millimole per Hour | mmol/h | 2.77778E-07 mol/s |
| Millimole per Day | mmol/d | 1.15741E-08 mol/s |
| Micromole per Second | µmol/s | 1E-06 mol/s |
| Megamole per Second | Mmol/s | 1000000 mol/s |
| Gigamole per Second | Gmol/s | 1E+09 mol/s |
About These Parameters
- Value
- The molar flow rate value you want to convert, expressed in the "From" unit. Accepts decimals.
- From Unit
- The unit your input value is currently measured in — a reactor feed spec's mol/s, or a plant mass-balance sheet's kmol/h.
- To Unit
- The unit you want the result converted into. Use the swap button to flip From and To instantly.
How Flow - Molar Conversion Works
The Formula
Every unit here is defined by a fixed multiplier relative to moles per second. To convert a value from one unit to another:
result = value × (factor of "From" unit ÷ factor of "To" unit)
For Mole per Hour → Mole per Second: multiply by 0.0002777778. For example, 1 mol/h × 0.0002777778 = 0.0002777778 mol/s.
Molar Flow vs. Mass Flow
This site's separate Flow - Mass Converter measures how much MASS (kilograms, pounds) passes a point per unit time, while this page measures how many MOLES pass instead. The two are related by molar flow = mass flow ÷ molar mass of the substance — but that conversion requires knowing exactly which gas or fluid is flowing, since every substance has a different molar mass (water is about 18 g/mol, while carbon dioxide is about 44 g/mol). Because of that substance-dependence, molar flow and mass flow can't be converted with a fixed multiplier the way the units on this page can — you always need the specific compound's molar mass as an extra input.
Why Moles Matter in Process Engineering
Balanced chemical equations are written in mole ratios — one mole of methane reacts with two moles of oxygen, for instance — so reactor mass balances, catalyst dosing, and conversion/yield calculations are all naturally done in moles rather than mass or volume. Molar flow also plugs directly into the ideal gas law (PV = nRT), letting engineers relate a gas stream's molar flow rate to its pressure, volume, and temperature without any substance-specific density lookup. This is why process flow diagrams and reactor design calculations almost always carry a molar flow rate figure alongside, or instead of, a mass or volumetric flow rate.
Example
A molar flow rate of 1 mol/h equals 0.0002777778 mol/s. For scale, a small laboratory continuous-flow reactor might run at only a few mmol/s, while a full-scale industrial ammonia synthesis reactor can process feed gas at hundreds of kmol/h.
Frequently Asked Questions
How many Moles per Second are in 1 Mole per Hour?
1 Mole per Hour (mol/h) equals exactly 0.0002777778 Moles per Second (mol/s).
What is molar flow rate used for?
Molar flow rate is used throughout chemical engineering to size reactors, calculate reaction conversion and yield, balance mass across a process, and apply the ideal gas law to gas streams — anywhere a calculation depends on the number of reacting particles rather than their mass or volume.
How do I convert molar flow to mass flow?
Multiply the molar flow rate by the substance's molar mass: mass flow = molar flow × molar mass. For example, 10 mol/s of water (molar mass 18.015 g/mol) is a mass flow of about 180.15 g/s. This site's units page can't do that step for you since it requires knowing which specific substance is flowing — use the site's separate Flow - Mass Converter once you have the mass figure.
How accurate are these conversions?
Every conversion factor used here is an exact, fixed multiplier relative to moles per second (a simple ratio of time-unit and metric-prefix scaling) — results are limited only by floating-point display precision, not by rounded conversion constants.