Atomic Mass

I think you are asking for the mass of 0.35 moles of methane (CH4). First, we find the molecular mass of methane by addin the masses of all of the atoms. A carbon is 12, and each H is 1, so the molecular mass of CH4 is 16g/mole.

Now we multiply 0.35 moles by 16 g/mole. The moles cancel out, and we have 5.6 g.

For finding the atomic mass of any element, we have to get sum of number of protons & number of neutrons. Atomic Mass (A) : p+n. * p = no. of protons. * n = no. of neutrons. Therefore, atomic mass of oxygen is 15.

Rn has 86 electrons, Th is the closest to having an atomic mass of 230

The atomic mass of the element with eight protons and nine neutrons is 17 atomic mass units. This is calculated by adding the number of protons and neutrons together, as electrons contribute negligible mass to the overall atomic mass.

The atomic number represents the number of protons in an atom, while the atomic mass represents the sum of protons and neutrons. Generally, the atomic mass is larger than the atomic number for most elements since it includes both protons and neutrons.

Atomic mass increases from top to bottom and left to right on the periodic table. In each row, the noble gasses have the highest atomic mass. As you travel down that column, also called a group or family, the noble gasses increase in atomic mass. The naturally occurring noble gas with the highest atomic mass is Radon (Rn; atomic mass = 211.4 amu).

In 2002, the unstable element Ununoctium was synthesized, and although it is a member of group 18, it was later determined to be a solid at room temperature, so it is not classified as a noble gas.

The average atomic mass of the element would be the average of the atomic masses of the three isotopes. Since they occur in equal amounts, the average atomic mass would be the sum of the atomic masses of the three isotopes divided by 3. This average atomic mass is a weighted average, taking into account the relative abundance of each isotope.

Basic arithmetic (5+6) suggests that the atomic mass is eleven.

Alcohol is a molecular compound made up of different elements such as carbon, hydrogen, and oxygen. Therefore, it does not have a single atomic number or atomic mass. The atomic number and atomic mass of the individual elements in alcohol (e.g., carbon, hydrogen, and oxygen) would need to be considered instead.

atomic mass unit (short: a.m.u.), symbol 'u', equiv. with (in S.I. units) 1.66054*10-27kg

The atomic mass number of an element is the sum of the number of protons and neutrons in its nucleus. To get the atomic mass number of 28.09, it typically corresponds to the average atomic mass of an element on the periodic table. For example, the element silicon has an average atomic mass of approximately 28.09, indicating that a silicon atom has an atomic mass number of around 28.

The element with atomic mass number 207 is lead (Pb). Lead is a heavy metal that is commonly used in batteries, construction materials, and ammunition.

Among these three elements, Cl has the greatest mass, as can be seen from any periodic table or other reference work that shows atomic masses.

The atomic mass for Ge (germanium) is approximately 72.63 grams per mole.

Magnesium has 12 protons and electrons and its electronic configuration is 2.8.2, therefor it has 2 electrons in its 3rd energy level or elcectron outer shell

In an atom of chlorine with an atomic number of 17, the number of protons in the nucleus is 17. Since the atom is neutral, it will also have 17 electrons. Neutrons can be calculated by subtracting the atomic number from the atomic mass, so for chlorine with an atomic mass of 35, it would have 35 - 17 = 18 neutrons in the nucleus.

The number of neutrons in an atom can be calculated by subtracting the atomic number (protons) from the atomic mass. In this case, for the isotope of yttrium with an atomic number of 39 and an atomic mass of 89, the number of neutrons is 50 (89 - 39 = 50).

To calculate the atomic mass of an atom, you would need to know the atomic number (number of protons) and the mass number (sum of protons and neutrons) of the atom. The atomic mass is typically a weighted average of the isotopes of that element based on their abundance.

To find the number of neutrons in an atom, you would subtract the atomic number (number of protons) from the atomic mass (sum of protons and neutrons). The difference between the atomic mass and the atomic number gives you the number of neutrons in the atom.

To calculate the relative atomic mass of an element (which is by its definition an average), you need the mass number and relative abundance of each isotope present.

Suppose we have the following data from the mass spectrometer:

first isotope mn X, abundance A%

second isotope mn Y, abundance B%

third isotope mn Z, abundance C%.

Then ram = (A/100 x X) + (B/100 x Y) + (C/100 x Z)

If there are more than 3 isotopes, just do the same for each one and add all the expressions together.

The element that has the atomic mass of 12 is carbon.

For elements the correct expression is atomic weight (not mass).

The atomic weight of carbon (after IUPAC 2009) is [12,0096; 12,0116] or as a more simple, conventional value 12,011.

The approximate mass of an oxygen atom in atomic mass units is 16. Oxygen has an atomic number of 8, which means that its atomic mass is approximately 16 atomic mass units.

False - an electron is about 1/1836 the mass of a proton.

The atomic mass of nobelium is approximately 259.1 atomic mass units.

Numbers should only ever be rounded when a number of significant figures are expressly requested. In this case you would simply leave it as 79.904. However, if you were asked to round 79.904 to two significant figures then the correct answer would be 80 to 2 s.f. Note that you must explicitly specify the significance of the trailing zero otherwise it implies an unwanted level of precision.