`DeltaH` for combustion of ethane and ethyne are `-341.1` and `-310.0kcal` respectively. Which gas is better for welding purpose and why ?

DeltaH for combustion of ethene and ethyne are -341.1 and -310.0 kcal, respectively. What will be the ratio of calorific values of ethane and ethyne, respectively?

The values of heat of combustion of ethane (C_(2)H_(6)) and ethyne (C_(2)H_(2)) are -341 and -310 Kcal respectively. Then which of the following is better fuel on mass basis:

The heats of combustion of ethane, ethene and acetylene are -341.1 kcal, -330 kcal and -310.9 kCal mol^(-1) respectively. The best fuel among them is

2 moles of a mixture of acetylene and ethane produced on combustion, 5500 kJ of heat energy. The enthalpies of combustion of acetylene and ethane are 2000 and 3000 kJ mol^(-1) respectively. The ratio of acetylene to ethane in the mixture is

The heat of hydroggenation for 3-methylbutene and 2-pentene are 30-kcal/mol and -28kcal/ mol respectively . The heats of combustion of 2-methylbutane and pentane are -784 kcal/mol and -782 kcal /mol respectively. All the values are given under standard conditions. Taking into account that combustion of both akanes give the same products, what is DeltaH (in kcal.mol)n for the following reaction under same conditions ?