Help me pleaseee C3H8 (g) + 5 O2 (g)
->
3 CO2 (g) + 4 H2O (9)

1. Use stoichiometry to determine how many moles of O2 are needed
to completely react with 2.25 moles of C3H8.

11.25 moles of will be required to completely react with 2.25 moles of .

Explanation:

The balanced chemical equation is:

According to stoichiometry :

1 mole of require = 5 moles of

Thus 2.25 moles of will require=  of  

Thus 11.25 moles of will be required to completely react with 2.25 moles of .

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 :