The products in a reactions will always have... (a) the same total mass as the reactants

(b)the same number of molecules as the reactants

(c) less mass than the reactants

(d) a greater number of molecules than the reactants

whats the meaning of /

1. they vary with a higher number because boiling is way hotter than melting

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 :