Two hundred grams of a substance requires 18.8 kj of heat to raise its temperature from 25°c to 45°c. use the table to identify the substance.

ammonia

Explanation:

Q= heat gained  = 18.8 kJ

m= mass of the substance = 200 g

c = heat capacity of unknown substance= ? J/g ° C      

Thus the unknown substance is ammonia which has a heat capacity of

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).