0
Molecular Mass
Molecular mass measures the mass of a molecule. It is measured by adding together the atomic masses of atoms the molecule is made of.
617 Questions
How many moles of water contain 2.60 X 1023 molecules of water?
follow the avagardo number
here,
2.60x10^23 molecules of H2O X 1mole
-------
6.02x10^23 molecule of H2O ( molecule of H2O cancel and just remain with mole )
so,
2.60x10^23
----------------- moles
6.02x10^23
your final product wii be 0.43 mole of H20
source
me rata mokai
What is the gram molecular weight of Sodium hydroxide if its molecular mass is 40 a.m.u?
The a.m.u. is defined as the fraction of 1/12 of an atom of the carbon-12 isotope. The value is pretty nearer to the mass of a hydrogen atom. Therefore, in every compound, the gram molecular weight is numerically equal to the molecular mass in atomic mass units. Therefore the gram molecular weight of NaOH is 40 g/mol.
What does the atom do when the electron moves from lower to higher energy level?
When an electron moves from a lower to a higher energy level, it absorbs energy and jumps to a higher orbit. This process is known as excitation. The electron can then release this absorbed energy as light when it moves back down to a lower energy level.
What is the mass of 2.6 moles of silver?
The molar mass of silver is approximately 107.87 g/mol. Therefore, the mass of 2.6 moles of silver would be 2.6 moles x 107.87 g/mol = 280.3 grams.
What is the molecular mass for AlBr3?
you take the mass of Al plus three Br. (27.0) + 3(80.0)
the answer is 267.
Why is C-12 taken as standard for finding atpmic or molecular mass?
Basically, because "Why not?"
Something needs to be the standard. Carbon-12 is fairly common, and it's not oxygen (which was the previous standard; unfortunately, some people took naturally occurring oxygen as the standard and others took oxygen-16 specifically.).
Indeed, the standard was changed from oxygen to be a compromise between the chemists and physicists who used the differing definitions for Oxygen.
It is not Hydrogen because it was not easy to use experimentally to compare elements. (See here http://www.enotes.com/earth-science/atomic-mass-weight)
A detailed history is given here (http://www.iupac.org/publications/ci/2004/2601/1_holden.html).
How do you find molecular mass if specific volume is given?
To find the molecular mass if specific volume is given, you can use the ideal gas law. The ideal gas law relates the pressure, volume, temperature, and the number of moles of gas to the gas constant. By rearranging the ideal gas law equation and solving for the molecular mass, you can determine the molecular mass of the gas.
What is the molecular mass of MgSO4.7H2O?
The molar mass of MgSO4.7H2O (magnesium sulfate heptahydrate) is calculated as the sum of the individual atomic masses of magnesium (Mg), sulfur (S), oxygen (O), and hydrogen (H). The molecular mass is approximately 246.47 g/mol.
2.80 moles of Na represents 2.80 times Avogadro's number of sodium atoms, which is approximately 1.69 x 10^24 atoms of sodium.
The term molecular mass is used for water because it exists as discrete molecules containing two hydrogen atoms and one oxygen atom. Aluminum chloride, on the other hand, does not exist as discrete molecules but as an ionic compound made up of aluminum and chlorine atoms held together by ionic bonds. Therefore, the term formula mass is used to describe the total mass of one formula unit of aluminum chloride.
What is the molecular mass of hydrogen sulphide H2S?
The molecular mass of hydrogen sulfide (H2S) is 34.08 grams per mole.
No - light is not formed by molecules.
Molecules are groups of atoms bonded together by chemical bonds. Examples are water (two atoms of hydrogen and one atom of oxygen, H2O, and methanoic
acid, HCOOH).
Light is formed by elementary particles of the boson category called photons. Since in quantum mechanic particles are described by a quantum field, light can also be seen as an electromagnetic field that can be described through two related vector field: the electrical and the magnetic field (or through a Minkosky
four dimensional tensor collecting the two vector components). To be precise visible light (that we generally call simply light) is an electromagnetic field oscillating in a well precise frequency interval where the human eye is sensible and can detect photons. Since different frequencies of visible light are sensed like different elementary colors by the human brain elaborating information coming from eyes, in the visible frequency band light frequencies are also called
colors.
Photons are responsible of electromagnetic interactions, so that many chemical bonds forming molecules can be interpreted in quantum mechanics as exchange of photons between the involved atoms. For example this is the case of the ion bond binding the Cl (Chloride) and Na (Sodium)
ions in common table salt
What is the molecular mass of adrenaline?
The molecular mass of adrenaline, also known as epinephrine, is approximately 183.21 g/mol.
What is molecular mass of zncl2?
The molecular mass of ZnCl2 (zinc chloride) is calculated by adding the atomic masses of the elements in the compound. The atomic mass of zinc (Zn) is approximately 65.38 g/mol and the atomic mass of chlorine (Cl) is approximately 35.45 g/mol. Therefore, the molecular mass of ZnCl2 is approximately 136.33 g/mol.
What is the relative molecular mass of caco3?
The relative molecular mass of CaCO3 (calcium carbonate) is approximately 100.09 g/mol.
What is molecular mass of h2so4?
The mass in grams of one mole H2SO4 is: 98.079 g/mol (molar mass)
The mass in grams of one molecule H2SO4 is (molecule mass):
98.079 (g/mol) / 6.02214*10+23(molecules/mol) = 16.286*10-23 g/molecule
What is the average molecular mass of drugs?
The average molecular mass of drugs is nearly about ~100-500 u.
What happens to the volume of a gas when the number of moles doubles?
If the number of moles of a gas doubles at constant pressure and temperature, the volume of the gas will also double according to Avogadro's law. This is because the volume of a gas is directly proportional to the number of moles present.
Can Atomic mass be used to determine molecular mass?
Yes, the accumulation of atomic masses of the atoms within a molecule is the molecule's molecular mass.
What is the molecular mass of As2O5?
The molecular mass of As2O5 (arsenic pentoxide) is 229.84 g/mol.
Is 44 amu is equal to molecular mass?
No, 44 amu (atomic mass units) refers to the average mass of an atom of an element. Molecular mass, on the other hand, refers to the sum of the atomic masses of all the atoms in a molecule. So, they are not equal.
Do high refractive neccessarily mean high molecular mass?
No, high refractive index does not necessarily mean high molecular mass. Refractive index is a measure of how much a material bends light, which can be influenced by factors like the electronic structure and density of the material, in addition to molecular mass.
Why do relative molecular mass have decimals?
They are the calculated averages of all the isotopes of a particular element in accordance to their relative abundances, and hence is generally not an integer due to the mathematical division involved.
