What molar mass is MgO?

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Hint: We know that the molar mass of the substance is the weight of one mole of the sample. In order to calculate the molar mass of the substance, we need to add the atomic masses of all the atoms within the molecule.

Complete answer:

Here, in the given question we need to calculate the molar mass of magnesium oxide. The molar mass, also referred to as molecular weight, is the sum of the atomic weight of all the atoms present in the given molecule. We can also say it is the sum of the molecular weights of all the elements present.Also, to calculate the molar mass of magnesium oxide, we should know about the chemical formula of magnesium oxide, \[MgO\]. Then, we should know the molecular weights of magnesium and oxygen given in the periodic table. The molecular weight of the element magnesium is \[24.31g/mol\]The molecular weight of the element oxygen is \[16g/mol\]Molar mass of magnesium oxide, \[MgO\] = \[16\,\, + \,\,24.31\,g/mol\]Molar mass of magnesium oxide, \[MgO\]= \[40.31\,g/mol\]

Therefore, the molar mass of magnesium oxide is \[40.31\,g/mol\].

Note:

Always remember that the molar mass which is also referred to as molecular weight is the weight of one mole of substance. One mole of substance contains \[6.023 \times {10^{23}}\] entities. These entities can be atoms, molecules or ions. A mole is just a standard value to calculate different things in chemistry just like one dozen contains twelve entities. Mole is used to calculate size of the smallest entities quantitatively. Molar mass is always expressed in grams (g) and Kilograms (Kg).

Molar mass of MgO = 40.3044 g/mol

This compound is also known as Magnesium Oxide.

Convert grams MgO to moles or moles MgO to grams

Molecular weight calculation:
24.305 + 15.9994

›› Percent composition by element

Element	Symbol	Atomic Mass	# of Atoms	Mass Percent
Magnesium	Mg	24.3050	1	60.304%
Oxygen	O	15.9994	1	39.696%

›› Calculate the molecular weight of a chemical compound

›› More information on molar mass and molecular weight

In chemistry, the formula weight is a quantity computed by multiplying the atomic weight (in atomic mass units) of each element in a chemical formula by the number of atoms of that element present in the formula, then adding all of these products together.

A common request on this site is to convert grams to moles. To complete this calculation, you have to know what substance you are trying to convert. The reason is that the molar mass of the substance affects the conversion. This site explains how to find molar mass.

The atomic weights used on this site come from NIST, the National Institute of Standards and Technology. We use the most common isotopes. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. This is not the same as molecular mass, which is the mass of a single molecule of well-defined isotopes. For bulk stoichiometric calculations, we are usually determining molar mass, which may also be called standard atomic weight or average atomic mass.

Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. These relative weights computed from the chemical equation are sometimes called equation weights.

Finding molar mass starts with units of grams per mole (g/mol). When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.

If the formula used in calculating molar mass is the molecular formula, the formula weight computed is the molecular weight. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100.

Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance.

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Molar mass of MgO is 40.30440 ± 0.00090 g/mol
Compound name is magnesium oxideConvert between MgO weight and moles

Elemental composition of MgO

Element	Symbol	Atomic weight	Atoms	Mass percent
Magnesium	Mg	24.3050	1	60.3036
Oxygen	O	15.9994	1	39.6964

Mass percent composition	Atomic percent composition

Sample reactions for MgO

Formula in Hill system is MgO

To calculate molar mass of a chemical compound enter its formula and click 'Compute'. In chemical formula you may use:

Any chemical element. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
parantesis () or brackets [].
Common compound names.

Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose.

Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.

To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.
Examples of molecular weight computations: C[14]O[16]2, S[34]O[16]2.

Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.

Weights of atoms and isotopes are from NIST article.

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