Question

A)

Using Hess’sLaw determine the standard enthalpy of reactionfor the

completecombustion of methanol.

CH3OH (l) +O2 (g) ----->

Given thefollowing reactions and enthalpies of formation,calculate theenthalpy of

reaction forthe equation.

C (s,graphite) + 2 H2 (g) + 1⁄2 O2(g) --> CH3OH(l) ΔHf0 (1) =-238.7 kJ

C (s,graphite) + O2 (g) ----> CO2(g) ΔHf0 (2) =-393.5 kJ

H2 (g) + 1⁄2O2 (g) --> H2O (l) ΔHf0 (3) = -285.8kJ

B)

What is thechemical equation for the standard enthalpy offormation for

KClO3(s)?

C) If an explosion occurs in a cylinder with piston(likea car), and it gives off 76

kJ of heatand does 25 kJ of work, what is the change in internalenergy?

Generalequation for internal energy:___________________________________

D)

If I put2.05 g of sodium carbonate (formula mass = 105.99g/mol) and 5.43g

of aceticacid, CH3COOH (formula mass = 60.05 g/mol) in a balloonand tied itat 25 °C

and 0.98atm, what would be the volume in liters of the balloon(assume idealgas)?

Hint:remember to balance the chemical equation and base the answeron thelimiting

reagent.

Na2CO3 (s) +CH3COOH (l) ---> CH3COONa (aq) + CO2 (g)+ H2O (l)