Definition of molecular mass in oxygen scale
Answers
Answer:
An atomic mass unit (a.m.u) is defined as precisely
12
1
the mass of carbon-12 atom. It is a unit of mass of elements e.g the atomic mass of Helium is 4 a.m.u.
FORMULA MASS UNIT - DEFINITION
The formula unit mass of a substance is the sum of the atomic masses of all the atoms in the formula unit of a compound. For example, calcium oxide has a formula unit CaO. Formula unit mass is calculated in the same way as molecular mass.
ATOMIC MASSES OF VARIOUS ELEMENTS - DIAGRAM
concept
The atomic masses of various elements are:
RELATIVE ATOMIC MASS W.R.T. HYDROGEN SCALE - DEFINITION
Number of times one atom of an element is heavier than the mass of an atom of hydrogen.
RELATIVE MOLECULAR MASS W.R.T. CARBON - DEFINITION
Number of times one molecule of the substance is heavier than
12
1
the mass of an atom of carbon.
RELATIVE ATOMIC MASS W.R.T C-12 ATOM - DEFINITION
Number of times an atom of an element is heavier than the
12
1
the mass of an atom of carbon.
MOLECULAR MASS NUMERICALS - DEFINITION
Q. Calculate molecular mass of H
2
O.
No. of atoms of Hydrogen is 2, hence, atomic mass will be 1+1=2. Atomic mass of O is 16. As molecular mass is the addition of atomic masses, hence, 2+16=18 is the molecular mass of water.
Explanation:
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Answer:
The sum of the atomic masses of all atoms in a molecule, based on a scale in which the atomic masses of hydrogen, carbon, nitrogen, and oxygen are 1, 12, 14, and 16, respectively.
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