What mass of ethane gas (C2H6) must burn in excess oxygen to produce 2.00 x 103 kJ of heat, given the thermochemical equation
2C2H6(g) + 7O2(g) ? 4CO2(g) + 6H2O(l) ?H = -3.12 x 103 kJ
1.) 0.641 g 2.) 19.3 g 3) 38.6 g
4. heat is not produced by this reaction
5. none of these