# What is RAM and RMM?

RAM is a mass of an atom, relative to the mass of C-12. … RMM is a mass of a molecule, relative to the mass of C-12. Since it is a ratio, it is unitless.

## How do you calculate RAM and RMM?

It is often shortened to RMM. The RMM is used in many sorts of calculations in chemistry, and so you must be able to calculate it to answer all the other calculations you might meet.

Calculating the Relative Molecular Mass (RMM) of Compounds.

Relative Atomic Masses
Element Symbol RAM
Carbon C 12
Hydrogen H 1
Oxygen O 16

## What is the meaning of RMM in chemistry?

relative molecular mass in British English

noun. the sum of all the relative atomic masses of the atoms in a molecule; the ratio of the average mass per molecule of a specified isotopic composition of a substance to one-twelfth the mass of an atom of carbon-12. Symbol: Mr. Abbreviation: r.m.m..

## How do you calculate RMM?

The relative molecular mass/relative formula mass is defined as the sum of all the individual atomic masses of ALL the atoms in the formula (Mr). e.g. for ionic compounds e.g. NaCl = 23 + 35.5 58.5) or molecular mass for covalent elements or compounds …

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## What is the RAM in chemistry?

Relative atomic mass is often abbreviated as r.a.m. … The relative atomic mass of an element is the weighted average of the masses of the isotopes in the naturally occurring element relative to the mass of an atom of the carbon-12 isotope which is taken to be exactly 12.

## How do you work out RAM?

You can always find the relative mass of an element by adding the number of protons to the number of neutrons for the specific isotope of the element you’re considering. For example, a carbon-12 atom has 6 protons and 6 neutrons, and so has a relative atomic mass of 12.

## What do isotopes mean?

Isotope, one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behaviour but with different atomic masses and physical properties. Every chemical element has one or more isotopes.

## What is relative formula?

The relative formula mass of a compound is calculated by adding together the relative atomic mass values for all the atoms in its formula. Moles are units used to measure substance amount. Chemistry (Single Science)

## How do atoms exist?

Atoms exist in free states in the form of molecule. … Molecules may be formed by the combination of atoms of two or more different elements. For example molecule of water. It is formed by the combination of two atoms of hydrogen and one atom of oxygen.

## Is RFM and RMM the same?

It’s basically the same. Relative atomic mass is the summation of the individual masses of the atoms. This mostly applied to molecular compounds like water, ammonia, etc. … Formular mass applies to ionic compounds.

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## How is equivalent weight calculated?

Equivalent Weight = Molecular weight/ Valency

Therefore, the equivalent weight of H3PO4 is 49.

24.305 u

## What is carbon12 scale?

Carbon-12 is of particular importance in its use as the standard from which atomic masses of all nuclides are measured, thus, its atomic mass is exactly 12 daltons by definition. Carbon-12 is composed of 6 protons, 6 neutrons, and 6 electrons.

## What is an average atomic mass?

The average atomic mass (sometimes called atomic weight) of an element is the weighted average mass of the atoms in a naturally occurring sample of the element. Average masses are generally expressed in unified atomic mass units (u), where 1 u is equal to exactly one-twelfth the mass of a neutral atom of carbon-12.

15.999 u

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