High-purity benzoic acid (c6h5cooh; δhrxn for combustion = −3227 kj/mol) is used as a standard for calibrating bomb calorimeters. a 1.221-g sample burns in a calorimeter (heat capacity = 1365 j/°c) that contains exactly 1.430 kg of water. what temperature change is observed?

Answer : The temperature change observed is

Explanation :

First we have to calculate the heat released by the combustion of benzoic acid.

where,

q = heat released by combustion of benzoic acid = ?

n = moles of benzoic acid =

= enthalpy of combustion = 3227 kJ/mole

Now put all the given values in the above formula, get:

Now we have to calculate the heat absorbed.

Heat released by combustion = Heat absorbed by the calorimeter + Heat absorbed by the water

where,

q = heat released by the combustion = 31947.3 J

= heat absorbed by the calorimeter

= heat absorbed by the water

= specific heat of calorimeter =

= specific heat of water =

= mass of water = 1.430 kg  = 1430 g

= change in temperature = ?

Now put all the given values in the above formula, we get:

Therefore, the temperature change observed is

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.