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Atomic Mass
Atomic mass is the mass of protons, neutrons, and electrons in a single specific atom.
1,752 Questions
What is the mass of 2.47 moles of fluorine atoms?
The gram atomic mass of fluorine is 18.9984. Therefore, the mass of 2.47 moles is 2.47 times the gram atomic mass, or about 46.9 grams, to the justified number of significant digits.
What is the mass of chlorine-35 relative to carbon-12?
The nucleon numbers 35 and 12 represent the relative isotopic mass of the isotopes. So, chlorine-35 is about three times heavier compared to carbon-12. You can see all the (average) atomic masses of the elements in the periodic table.
What is the mass of F in 24.6g of Tin II Flouride?
The formula for tin(II) fluoride is SnF2. The molar mass for that compound is 157g/mol, and its percent composition is 76% tin and 24% fluorine. (calculated from dividing the atomic masses by the total) So, if you have 24.6g of the compound, 24% by mass will be accounted for by the fluorine, and 24% OF 24.6g is about 5.9g of fluorine.
Pick up a periodic table. There are numbers above and below each element. Eg, carbon will have a 6 (atomic number) and 12(.011). The 12.001 is Carbon's mass. If it is molecular mass, it involves adding the atomic masses together. And remember, say if it is O2 you add it twice because there are two of that element.
What is phosphorus' atomic number and atomic mass number?
Atomic number for p is 15. atomic mass for p is 31.
What has 8 neutrons and a atomic mass of 14.0067?
Atoms of carbon-14 isotope has six electrons and eight neutrons, so the relative atomic mass of 14.
How atomic number better than atomic mass?
No two elements may have the same atomic number. But two elements may have same atomic mass. Hence atomic number is better than atomic mass.
Why does not atomic mass of element represent the actual mass of the atoms?
Because the gram atomic mass of an element is the mass in grams of Avogadro's Number of atoms. To find the actual mass of a single atom, the gram atomic mass must therefore be divided by 6.022 X 1023.
An atom's atomic mass is usually thought of as the total number of protons and neutrons together. Each has a relative mass of 1, so the count of each equals the atom's atomic mass. For example, 1 ordinary atom of sodium (Na) has 11 protons and 12 neutrons. Its atomic mass therefore is 23.
The overall atomic mass of an element, however, is a weighted average of its isotopes, which occur in consistent ratios throughout the universe.
atom have: 20 protons,20 electrons and20 neutrons
ion have: 20 protons 18 electrons( metals lose electrons) and20 neutrons
What is atomic mass A and neutron number N for given atom?
Atomic mass is the number of protons and neutrons that make up an atom.
The neutron number is only the number of neutrons present in the atom. This can be found by subtracting the number of protons from the atomic mass.
What is the relative atomic mass of phosphoric acid?
The relative atomic mass of phosphoric acid (H3PO4) is calculated by adding the atomic masses of all the constituent atoms. Phosphoric acid contains one phosphorus atom with an atomic mass of approximately 31.0, three hydrogen atoms with an atomic mass of approximately 1.0 each, and four oxygen atoms with an atomic mass of approximately 16.0 each. Adding these together gives an approximate relative atomic mass of 98.0.
The average mass of a crow is typically around 300-600 grams, depending on the species and individual size.
What element is a very dense metal with an atomic mass of 207.2 amu?
The element you are referring to is lead, with the atomic number 82 and a very high density of 11.34 g/cm^3.
What is the mass of a house key in grams?
A house key will vary in weight depending on the metal used and the size of the key. On average, a house key weighs about four ounces.
What are the major sources of error in your determination of the molar mass?
1.) Some of the sample may have been lost in between testing that could resulted in slight
error when calculating your molar mass.
2.) Weighing sample incorrectly and having too low/high std. deviation
How do you find the atomic mass of an element?
Atomic mass (not to be confused with atomic mass number) refers to the mass of a given atom of a specific isotope, and is often expressed in unified atomic mass units. Atomic mass is found by adding together the individual masses of the protons and neutrons in the nucleus (the mass of electrons is comparatively insignificant). The value displayed on the periodic table is a weighted average based on the relative natural occurrence of all possible isotopes of an element.
What makes atomic mass complicated is the fact that elements come in more than one isotope. Chemists need to know what a given element will actually weigh, in order to know how much to use (and so forth) when working with it in their laboratories, so the atomic mass refers to the actual weight of that element, per atom on the average. This depends upon the isotopes that exist, and also upon the relative abundance of those isotopes. It can only be determined experimentally, it is not something derived from the periodic table. You have to actually weigh the element to find out what it weighs.
*The atomic mass number of an element is the total number of neutrons and protons for a given isotope. For example 14C or carbon-14 has 6 protons and 8 neutrons.
Atomic mass is equivalent to the number of?
The atomic mass is the mass of an atom of that element in AMUs. (Atomic Mass Units)
The atomic number, however, is equivalent to the number of protons in an atom of that element.
The relative atomic mass of an element is the weighted average of the masses of the isotopes relative to 1/12 of the mass of a carbon-12 atom.
It is a weighted average as it takes into account the relative abundances of the different isotopes (atoms of the same element but with different numbers of neutrons) of an element. This number is found in the periodic table.
For example chlorine has two isotopes, 35Cl and 37Cl, in the approximate ratio of 3 atoms of 35Cl to 1 atom of 37Cl.
The number of protons and neutrons in a 35Cl atom must add up to 35, the mass number. The relative atomic mass of chlorine takes into account both isotopes and is therefore 35.5.
What does the atomic mass equals the number of?
An isotope's mass number is the sum of the protons and neutrons in each atomic nucleus of the isotope.
Element does not exist so I have to ignore that part. Atomic mass as it appears on the periodic table is an average mass of gram (weight) per mole of atom (see avagadros number). Furthermore, it is average in the sense that it is weighted based on the percentage of a specific isotope existing (some contain more neutrons than others) with the actual weight of each isotope
What is the atomic mass of the element Cu?
The atomic mass of Cu (Copper) is 63.546 amu (atomic mass unit).
There are 18 neutrons. If the valence level has 7 electrons, that means the first is full, and always has 2(unless its hydrogen which has 1) and the second will be filled with 8 making 17 total. Since the electrons always equal protons we know there are 17 protons. Since atomic mass is protons plus neutrons, and atomic mass is 35 we minus 17 form 35 and have 18.
Why do you subtract the atomic number from the mass number?
We can find atomic mass and mass number in chemical elements. Atomic mass is about weight of the atom. Mass number is about total of neutrons and protons.
What does the atomic mass tell us?
it tells us that the number is equal to the number of protons plus the number of nuetrons in the nucleus of an atom
