Given the following information AH; (H20 (1)) - 285.8 kJ/mol and AH; (HF(9) --273.3 kJ/mol
What is the AH° for the following reaction and is it exothermic or endothermic?
2 F2 (g) + 2 H2O (1) + 4 HF (g) + O2 (g)
-521.6 kJ and exothermic
-521.6 kJ and endothermic
+12.5 kJ and exothermic
+ 12.5 kJ and endothermic

In this chemical reaction, 325 grams of barium (ba) react completely. how many moles of lithium (li) are produced?

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

While in europe, if you drive 125 km per day, how much money would you spend on gas in one week if gas costs 1.10 euros per liter and your car’s gas mileage is 32.0 mi/gal? assume that 1 euro=1.26 dollars