How many valence electrons does a fluorine atom contain?
a. 2
b. 5
c. 7
d. 9

Use the standard enthalpies of formation for the reactants and products to solve for the δhrxn for the following reaction. (the δhf of c2h4 is 52.26 kj/mol, co2 is -393.509 kj/mol, and h2o is -241.818 kj.) c2h4 (g) + 3o2(g) 2co2 (g) + 2h2o(g) δhrxn = the reaction is .

1) this is the structure in the cell nucleus that houses a cell's genetic information

How have the greenhouse gasses increased from the year 2000 to 2018