What is the specific heat of aluminum if it takes 172 cal to raise the temperature of a 67 g aluminum bar by 12.0 ∘C?

0.88 moles of n2o5 (g) was placed in a sealed 1.00 l vessel. calculate the equilibrium concentration of n2o5. no2, and o2 and the equilibrium constant after equilibrium has been reached by 65.0% of the n2o5 decomposing.