Question

LAST QUESTION:
When solid NH4NO3 decomposes, a mixture of gases is obtained:

2 NH4NO3(s)--> 4H2O(g) + O2(g) + 2 N2(g)

In an experiment, 5.02 g NH4NO3 decomposes completely in a rigid 5.00-L container. What is the total pressure in the container if the final temperature is 215oC?

Give your answer in atmospheres.

Answer 1

How many mols did yu start with?
That's mols NH4NO3 = grams/molar mass

Now convert mols NH4NO3 to mols H2O using the coefficients in the balanced equation. Do the same for mol O2 and the same for mols N2. Add mols to find total mols, then use PV = nRT to solve for pressure.