Question

question 17.77

AMMONA Ammonia, NH3, is used to make hydrazine, N2H4, which can be used as a fuel. Calculate AG° at 300 and 390 K for the following 17.76 reactions. (a) BaCOs(s)BaO(s) +CO2(g) (b) CH2COOH(l) - CH(g) +CO2g) 17.77 Suppose you are looking for a chemical reaction that is spontaneous at low temperatures but proceeds in the reverse direction at high temperatures. What are the signs of AH" and AS for such a reaction? 17.78 Suppose you are looking for a chemical reaction that is spontaneous at high temperatures but proceeds in the reverse direction at low temperatures. What are the signs of AH and AS° for such a reaction? 17.79 Identify which of the following statements are incorrect and change them so that they are true. The statements refer to the formation of 1 mol methanol (CH;OH) from carbon monoxide and hydrogen (all at 1 atm pressure and in the phase): gas COg)+2H2(g)CH OH(g) reaction depends entirely n0Ous O Robert Kyllo, 2008/Used under license from Shutterstock.com

Answer 1

As we

∆G° = ∆H° - T ∆S°

For spontaneous reaction ,∆G° = -ve

So sign of ∆H° & ∆S°

∆H°= negative

∆S° = negative