What is the molecular formular of a compound whose empirical formula is ch3 and whose molar mass is 30 g/mol?

You can take the molecular formula's mass of 30g and divide that by 15g of the empirical formula to get 2. Take that 2 and multiply it to the empirical to get the molecular formula of C2H6.

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'm pretty sure its b i might be wrong though!