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

Identify which properties could correspond to solids, plasmas, or both. maintain a unique shape. collide infrequently with other particles. have very high velocities. conduct electricity. protons. have a low temperature. has long-range order.

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided