A brown solid
element conducts
electricity well. Is it a
metal or non-metal?

Metal

Explanation:

Metals conduct electricity, because they have free and mobile electrons that can carry the electricity and spread it around. Nonmetals usually cannot conduct electricity, but there are a few exceptions.

well in order to answer this question you have to provide more information < 3

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :