17. Dry ice is the solid state of CO2. It will sublimate to the CO2 gas at room temperature. If there is 250grams dry ice, what is the volume for final CO2 gas at the pressure 1atm and room temperature 25C. Suppose we know Molar Mass (CO2)=44g/mol; PV = nRT; T 273.15K+C;R=0.08206atm.L/mok.K 19.Using enthalpies of formation aA+bBcC+dDHRN0=cHf0(C)+dHf(D)aHf(A)bHf(B) calculate the standard change in enthalpy for the thermite reaction: 2Al(s)+Fe2O3(s)Al2O3(s)+2Fe(s) This reaction occurs when a mixture of powdered aluminum and iron(III) oxide is ignited with a magnesium fuse. Standard enthalpy of formation: H+Al2O3(s)=1676kJ/mol;H,Fe2O3(s)=826kJ/mol; 21. Extra points question. Suppose you calculate the enthalpy change of the reaction in Q19. If 54 grams Al react with excessive Fe O3. how many heat is produced (Molar Mass Al=27g/mol)