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Sia ? 6 years, 5 months ago
An atom has a nucleus surrounded by electrons. But when three oxygen atoms combine to form an O3 molecule, it becomes Ozone. So another difference between atoms and molecules is that when similar atoms combine together in varying numbers, molecules of different properties can be formed.
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Sia ? 6 years, 5 months ago
Here, Z = 35, A=80
{tex}\therefore{/tex} No. of protons = Atomic no. = 35
No. of electrons = No. of protons = 35
No. of neutrons = A-Z
= 80 - 35 = 45
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Gaurav Seth 6 years, 5 months ago
Law of multiple proportions (John Dalton 1804) states that when two elements combine to form two or more compounds, the weight of one of the elements which combines with a fixed weight of the other, bears a simple whole number ratio. For example, hydrogen and oxygen combine to form two compounds H2O (water) and H2O2(hydrogen peroxide). In water, Hydrogen 2 parts and oxygen 16 parts In hydrogen peroxide hydrogen 2 parts and oxygen 32 parts.
The weights of oxygen which combine with same weight of hydrogen in these two compounds bear a simple ratio 1 : 2. Nitrogen forms five stable oxides:
N2O Nitrogen 28 parts Oxygen 16 parts
N2O2 Nitrogen 28 parts Oxygen 32 parts
N2O3 Nitrogen 28 parts Oxygen 48 parts
N2O4 Nitrogen 28 parts Oxygen 64 parts
N2O5 Nitrogen 28 parts Oxygen 80 parts
The weight of oxygen which combines with same weight of nitrogen in the five compounds bear a ratio 16 : 32 : 48 : 64 : 80 : or 1 : 2 : 3 : 4 : 5.
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Gaurav Seth 6 years, 5 months ago
(i) Gram atomic mass of Au= 197 g
Or
197g of Au contains = 6.022 x 1023
Therefore 1gm of Au contains = 6.022 x 1023/197*1 = 3.06 x 1021 atoms
(ii) Gram atomic mass of Na = 23 g
Or
23 g of Na contains atoms = 6.022x 1023
Or
1gm of Na contains atoms = 6.022x1023 /23 *1 = 26.2 x1021atoms
(iii) Gram atomic mass of Li = 7
Or
7g of Li contains atoms = 6.022 x 1023
Or
1g of Li contains atoms = 6.022 x 1023/7 *1= 86.0 x 1021 atoms
(iv) Gram atomic mass of Cl = 71 Or 71g of Cl contains atoms = 6.022x1023
Or
1 g of Cl contains atoms = 6.022x1023 /71 * 1= 8.48 x 1021atoms
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Dipole-Dipole interactions result when two dipolar molecules interact with each other through space. When this occurs, the partially negative portion of one of the polar molecules is attracted to the partially positive portion of the second polar molecule. This type of interaction between molecules accounts for many physically and biologically significant phenomena such as the elevated boiling point of water.
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Sia ? 6 years, 5 months ago
1000 cm3 of 0.15 M Na2CO3 contains Na2CO3 = 0.15 mol
100 cm3 of 0.15 M Na2CO3 Will contain Na2CO3 = {tex}\frac { 0.15 } { 1000 } \times 100 = 0.015 \mathrm { mol }{/tex}
Molar mass of Na2CO3 = 2 {tex}\times{/tex} Na +1 {tex}\times{/tex} C +3 {tex}\times{/tex}O =2 {tex}\times{/tex}23 +1 {tex}\times{/tex} 12 + 3 {tex}\times{/tex} 16= 46 + 12 + 48 =106 g mol-1
Therefore, Mass of Na2CO3 =Number of mole of Na2CO3 {tex}\times{/tex} Molar mass of Na2CO3 = 0.015 mole {tex}\times{/tex}106 g/mol = 1.59 g.
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