Which of the following is not an indication of a chemical change? formation of a precipitate formation of a gas the container gets hot the substance dissolves

the substance dissolves

Explanation: Chemical change is the change in which chemical composition of the substance changes.

Chemical changes are accompanied by following changes:

a) formation of precipitate

b) release or absorption of energy

c) formation of gas

d) change in color

When a substance dissolves, it only changes its state and thus there is no change in chemical composition.

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 :

i do not get it   at all