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1)Molecular mass is 12×2+6+16
=24+22
=46
2)law of constant proportion - (chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight. law of definite proportions. law of nature, law - a generalization that describes recurring facts or events in nature; "the laws of thermodynamics"
3)number of moles of Na = 7/23 =0.30
Given Mass = 7 g. Molar mass = 23 g. We know that ; To find the number of moles, we divide Given Mass by the molar mass.
4)Calcium hydroxide is an inorganic compound with the chemical formula Ca(OH)2. It is a colorless crystal or white powder and is obtained when calcium oxide is mixed, or slaked with water.... atomicity. Atomicity- no of total atoms present in a molecule.
5)Sodium atom is neutral whereas sodium ion is a charged specie with a charge of +1. The number of protons and electrons in sodium atom is same i.e 11 whereas the number of protons in sodium ion (11) is more than number of electrons (10). The size of sodium ion is smaller than sodium atom.
6)Formula mass is defined as the sum of atomic masses of the ions present in the formula unit of an ionic compound while molecular mass is the sum of the atomic masses of the atoms in a molecule. Formula mass is more general term than molecular mass and maybe used in referring to all compounds but not the molecular mass
7)Alcl3=aluminium chloride
8)Isobars. Isotopes
Chemicals elements which
have the same mass Different atomic structure of the same element
The atomic masses are equal The atomic masses are different
Often the physical properties are similar
Usually, physical properties are different
Atomic numbers are different Atomic numbers are the same
Chemical elements are different same chemical elements but in different forms
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