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Amar Kumar 8 years, 3 months ago
18.02 g/mole moles to grams.
For example, the molar mass of water is 18.02 g/mol. Thus: 1 mole H2O = 18.02 g H2O.
Posted by Sristi Papnai 8 years, 3 months ago
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Rajan Sharma 8 years, 3 months ago
A hydrogen bond is a the electrostatic attraction between two polar groups that occurs when a hydrogen (H) atom covalently bound to a highly electronegative atom such as nitrogen (N), oxygen (O), or fluorine (F) experiences the electrostatic field of another highly electronegative atom nearby.
In simple words, consider the molecule H+-F-; here H will have a partial positive charge and F will be with partial negative charge. Now if another H-F molecule comes in their proximity then a H-bond will be formed. Please remember: H-bond is just an electrostatic attarction, there is no sharing of electrons here.
H+-F- ------ H+-F- ----- H+-F- {------ are H bonds}
H-bonds have a huge importance in modern day chemistry; as the organic molecules such as NH3, sugar are soluble in water because they have the ability to form H-bonds with water molecules.
Vineet Kumar 8 years, 3 months ago
Posted by Sudhir Kumar 8 years, 3 months ago
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Posted by Sourabh Mathur 8 years, 3 months ago
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Shridha Sharma 8 years, 3 months ago
first understand what is ionization enthalpy : this enthalpy sometimes called ionization enegy, it suggest that amount of enegy is required to convert atom into ion or removal of electron from its outermost shell.
now we have to find electronic configuration of beryllium and boron , beryllium has 2 electrons in its outer most s-subshell, whereas boron has 2 electrons in s-subshell and 1 electron in 2p orbital , now we know that electron repels each other so 2s orbital of Böron apply repulsive force on 2p orbital so they easily comes out ,but berylium has 2 electrons at 2s orbital , in this state both electrons of 2s orbital are moving in opposite direction so they can not apply any repulsive force on each other hence to remove an electron we have to supply total amont of energy.
i hope u understand, if not please send me email on [email protected] so i can show u it by presentation.
Posted by Yana Pundir 8 years, 3 months ago
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Posted by Mansi Sharma 8 years, 3 months ago
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Shridha Sharma 8 years, 3 months ago
as water converts into H2O(ice) from H2O(water) its bond angle changes from 104 to 109 during change of state that's why ice expands hence its density decreases than water.
Kritik Rajpal 8 years, 3 months ago
Water expands on freezing and results in a decrease in density. Thus, ice has a lower density than that of water. Hence, it floats on water.
Posted by Satyam Tripathi 8 years, 3 months ago
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Bhawani Tanwar 8 years, 3 months ago
Posted by Vivek Kumar 8 years, 3 months ago
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Kritik Rajpal 8 years, 3 months ago
{tex}Molality = {Molarity \over Density}{/tex}
{tex}Molality = {3 \over 1.25}{/tex}
=> Molality = 2.4 m
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Rahul Poddar 8 years, 3 months ago
3Thank You