Given that (i) C( graphite) + O_(2)(g) rarr CO_(2)(g) , Delta H = - 393 .7 kJ mol^(-1) (ii) C ( diamond) rarrC ( graphite ) , Delta H= - 2.1 kJ mol^(-1) (a) Calculate Delta Hfor burning of diamond toCO_(2) (b) Calculate the quantityof graphite that must be burnt to evolve 5000 kJ of heat

Given that (i) C( graphite) + O_(2)(g) rarr CO_(2)(g) , Delta H = - 39

1.	Given that (i) C( graphite) + O_(2)(g) rarr CO_(2)(g) , Delta H = - 393 .7 kJ mol^(-1) (ii) C ( diamond) rarrC ( graphite ) , Delta H= - 2.1 kJ mol^(-1) (a) Calculate Delta Hfor burning of diamond toCO_(2) (b) Calculate the quantityof graphite that must be burnt to evolve 5000 kJ of heat
Answer» Solution :(a) Eqn.(ii)-Eqn. (i) GIVES the required result. (b) 393.7 KJ of HEATIS producedfrom graphite `= 12G` `:.` 5000kJ of heat will be producedfrom graphite `=(12)/( 393.7) xx5000g = 152.4g`