The most prevalent version of these is Oxygen 16, which has 8 protons and 8 neutrons, for a total atomic mass of 16. O16 accounts for 97.765% of all oxygen atoms on Earth. Mass number = Number of Protons + Number of neutrons = 8 + 8 = 16 Hence mass number for Oxygen is 16. Atomic mass of Oxygen is 15.9994 u. Note that, each element may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The unit of measure for mass is the atomic mass unit (amu). One atomic mass unit is equal to 1.66 x 10 -24 grams.

1. Mass Number Of Oxygen 17
2. Mass Number Of Oxygen 16

1. A periodic table for the atomic mass of the constituent atoms. Avagadro’s number (6.022x10^23), which is the number of atoms in one mole of a pure substance. In this case, oxygen.
2. Oxygen has an atomic number of eight, and the molar mass of oxygen is approximately 15.9994. To understand why knowing oxygen’s molar mass is important, we first have to understand what molar mass is and how it relates to doing calculations in chemistry. What Is Molar Mass?

What is the mass number of oxygen?

2 Answers

The most common Isotope Mass for Oxygen is 16 Atomic Mass Units.

Explanation:

The Weighted Average Atomic Mass for each element is found on the periodic table (That long decimal number near the bottom of each box). This number is a combination of all the known Isotopes and basically tells you the average mass you would expect per atom if you grabbed a random handful of them.

The Mass Number is the mass of a particular atom individually and is measured in Atomic Mass Units (AMU); these will always be whole numbers.

The most common Isotope is found by rounding the Weighted average found on the periodic table to the nearest whole number.

In this case Oxygen has a Weighted Average Atomic Mass of 15.999 AMU. So the Mass Number is 16.

Explanation:

Mass number#('A')# is the sum of the atomic number#'(Z')#, which is the number of protons, and neutrons #('N')# in the nucleus of a specific isotope of an element #('A=Z+N')#. Isotopes are named for their mass numbers. Oxygen has three naturally occurring isotopes.

The most common isotope of oxygen has 8 neutrons. Its atomic number is 8.

#'A=Z+N'#
#'A=8+8=16'#
This isotope of oxygen is oxygen-16.

Another isotope of oxygen has 9 neutrons.
#'A=8+9=17'#
This isotope is oxygen-17.

A third oxygen isotope has 10 neutrons.
#'A=8+10=18'#
This oxygen isotope is oxygen-18.

The following is the isotopic or nuclear notation of an isotope.

Related questions

Molar mass of C12H22O11 = 342.29648 g/mol

This compound is also known as Lactose or Sucrose or Maltose.

Convert grams C12H22O11 to moles or moles C12H22O11 to grams

Molecular weight calculation:
12.0107*12 + 1.00794*22 + 15.9994*11

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.

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.

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.

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.

Mass Number Of Oxygen 17

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.

Mass Number Of Oxygen 16

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.