1. Calculate the heat of hydrogenation of ethane (C2H6) given the following thermochemical equations:
a. 2C (graphite) + 3 H2 (g) –> CzHe (g) AHfo = - 84.5 kJ/mol
b. 2C (graphite) + 2 H2 (g) -> C2H4 (9) AHfo = 52.3 kJ/mol

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

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What state of matter is ice a. liquid b. element c. solid d. gas