When 1.025 g of naphthalene (c10h8) burns in a bomb calorimeter, the temperature rises from 24.25°c to 32.33°c. find δerxn for the combustion of naphthalene. the heat capacity of the calorimeter is 5.11 kj/°c?

Answer : The for the combustion of naphthalene is

Solution : Given,

Mass of naphthalene = 1.025 g

Initial temperature =

Final temperature =

Specific heat capacity of calorimeter =

Molar mass of naphthalene = 128 g/mole

First, we have to calculate the heat absorbed,

Formula used :

Now put all the given values in this formula, we get

Now we have to calculate the moles of naphthalene.

Moles of =

Now we have to calculate the for combustion of naphthalene.

where,

q = heat absorbed

n = number of moles

Now put all the values in this formula, we get

Therefore, the for the combustion of naphthalene is

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

hydrocarbons are organic compounds that contain only hydrogens and carbons. they can be saturated (those which contain only carbon-carbon single bonds) or unsaturated (those which contain carbon-carbon double or triple bonds) in nature. hydrocarbons can undergo several reactions like substitution, elimination etc.  

on substituting one or more hydrogen atoms in hydrocarbon it results in the formation of haloalkane. as the halogen atoms are large compared to the carbon and hydrogen atoms, due to which the molecular weight increases and the bond become polar because of presence electronegative halogen atom and results in the increase in boiling point of the haloalkane.

thus, the correct option is (b) that is the boiling point of the new compound increases on substituting a hydrogen atom with a halogen in a hydrocarbon.