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Relative Atomic Mass of Element Calculator

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Determination of Equivalent Mass Important Formulas of Basic Chemistry

✖Mass of an Atom is defined as the average mass per atom of a specific composition of an element.ⓘ Mass of an Atom [M_element]			+10% -10%
✖Mass of Carbon-12 atom is defined as the mass of the atom of the Carbon-12 isotope.ⓘ Mass of Carbon-12 atom [M_C-12]			+10% -10%

✖Relative Atomic Mass of an Element is defined as the ratio of the avg. mass of atom of specific composition to the 1/12th of the mass of atom of nuclide C-12.ⓘ Relative Atomic Mass of Element [A_r]

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Formula

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Relative Atomic Mass of Element

Formula

A r = \frac{M element}{(\frac{1}{12}) \cdot M C-12}

Example

15.98358 = \frac{15.99903 g}{(\frac{1}{12}) \cdot 12.0116 g}

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Relative Atomic Mass of Element Solution

STEP 0: Pre-Calculation Summary

Formula Used

Relative Atomic Mass of an Element = Mass of an Atom/((1/12)*Mass of Carbon-12 atom)
A_r = M_element/((1/12)*M_C-12)
This formula uses 3 Variables

Variables Used

Relative Atomic Mass of an Element - Relative Atomic Mass of an Element is defined as the ratio of the avg. mass of atom of specific composition to the 1/12th of the mass of atom of nuclide C-12.
Mass of an Atom - (Measured in Kilogram) - Mass of an Atom is defined as the average mass per atom of a specific composition of an element.
Mass of Carbon-12 atom - (Measured in Kilogram) - Mass of Carbon-12 atom is defined as the mass of the atom of the Carbon-12 isotope.

STEP 1: Convert Input(s) to Base Unit

Mass of an Atom: 15.99903 Gram --> 0.01599903 Kilogram (Check conversion here)
Mass of Carbon-12 atom: 12.0116 Gram --> 0.0120116 Kilogram (Check conversion here)

STEP 2: Evaluate Formula

Substituting Input Values in Formula

A_r = M_element/((1/12)*M_C-12) --> 0.01599903/((1/12)*0.0120116)

Evaluating ... ...

A_r = 15.9835792067668

STEP 3: Convert Result to Output's Unit

15.9835792067668 --> No Conversion Required

FINAL ANSWER

15.9835792067668 ≈ 15.98358 <-- Relative Atomic Mass of an Element

(Calculation completed in 00.004 seconds)

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Relative Atomic Mass of Element Formula

Relative Atomic Mass of an Element = Mass of an Atom/((1/12)*Mass of Carbon-12 atom)
A_r = M_element/((1/12)*M_C-12)

Why do we need to find the Relative Atomic Mass of an Element?

In order to perform accurate chemical calculations, relative atomic mass must be used rather than an individual mass number.
As a result, relative atomic mass takes into account all of the naturally occurring stable isotopes of an element.

What is the unit of Relative Atomic Mass?

As it is a ratio, relative atomic mass is a unitless quantity and is expressed as AMU, where,
1 amu= 1/12 th the mass of a Carbon-12 isotope.

How to Calculate Relative Atomic Mass of Element?

Relative Atomic Mass of Element calculator uses Relative Atomic Mass of an Element = Mass of an Atom/((1/12)*Mass of Carbon-12 atom) to calculate the Relative Atomic Mass of an Element, The Relative Atomic Mass of Element formula is defined as the ratio of the average mass per atom of specified composition of an element to 1/12 the mass of an atom of the nuclide carbon-12. Relative Atomic Mass of an Element is denoted by A_r symbol.

How to calculate Relative Atomic Mass of Element using this online calculator? To use this online calculator for Relative Atomic Mass of Element, enter Mass of an Atom (M_element) & Mass of Carbon-12 atom (M_C-12) and hit the calculate button. Here is how the Relative Atomic Mass of Element calculation can be explained with given input values -> 15.98358 = 0.01599903/((1/12)*0.0120116).

FAQ

What is Relative Atomic Mass of Element?

The Relative Atomic Mass of Element formula is defined as the ratio of the average mass per atom of specified composition of an element to 1/12 the mass of an atom of the nuclide carbon-12 and is represented as A_r = M_element/((1/12)*M_C-12) or Relative Atomic Mass of an Element = Mass of an Atom/((1/12)*Mass of Carbon-12 atom). Mass of an Atom is defined as the average mass per atom of a specific composition of an element & Mass of Carbon-12 atom is defined as the mass of the atom of the Carbon-12 isotope.

How to calculate Relative Atomic Mass of Element?

The Relative Atomic Mass of Element formula is defined as the ratio of the average mass per atom of specified composition of an element to 1/12 the mass of an atom of the nuclide carbon-12 is calculated using Relative Atomic Mass of an Element = Mass of an Atom/((1/12)*Mass of Carbon-12 atom). To calculate Relative Atomic Mass of Element, you need Mass of an Atom (M_element) & Mass of Carbon-12 atom (M_C-12). With our tool, you need to enter the respective value for Mass of an Atom & Mass of Carbon-12 atom and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

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