Answer:
a) The heat which we supply to water during boiling is used to overcome these forces of attraction between the particles so that they become totally free and change into a gas. This latent heat does not increase the kinetic energy of water particles and hence no rise in temperature takes place during the boiling of water.
b) Steam produces more severe burns than boiling water even though both are at 100oC because steam contains more heat, in the form of latent heat, than boiling water.
Explanation: 
i hope this will help u 
 
        
             
        
        
        
The answer is A. the attraction between atoms that enables the formation of chemical compounds.
        
             
        
        
        
Answer:
The equation to show the the correct form to show the standard molar enthalpy of formation:

Explanation:
The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy during the formation of 1 mole of the substance from its constituent elements, with all substances in their standard states.
Given, that 1 mole of  gas and 1 mole of
 gas and 1 mole of  liquid gives 2 moles of HBr gas as a product.The reaction releases 72.58 kJ of heat.
 liquid gives 2 moles of HBr gas as a product.The reaction releases 72.58 kJ of heat.

Divide the equation by 2.

The equation to show the the correct form to show the standard molar enthalpy of formation:

 
        
             
        
        
        
Answer:
<u>Oxidation state of Mn = +4</u>
Explanation:
Atomic mass of Mn = 55g/mol
From Faraday's law of electrolysis,
Electrochemical equivalent = 
i.e Z =  =
 =  = 0.0001424 g/C
 = 0.0001424 g/C
But Equivalent weight, E = atomic mass ÷ valency  = Z × 96,485
⇒  = 0.0001424 × 96,485
 = 0.0001424 × 96,485
<u>∴ Valency of Mn = +4</u>