1) (Limiting Reagent Problem) If 21 grams of lithium metal and 28 grams of oxygen gas are placed together in a container and allowed to react according to the unbalanced equation how many
grams of lithium oxide would be produced by the reaction? What are the limiting and excess
reactants? What is the percent yield of lithium oxide if the actual yield is 14 grams of Lithium
Oxide?
4
Li +
1
O2 →
2
Li2O

Anthracite is so hard and pure it is also referred to as a renewable resource metamorphic rock hot bituminous coal dirty fuel

Match the term to its description match term definition chemical energy a) internal energy caused by vibrations of atoms and molecules electrical energy b) electromagnetic energy that travels in waves radiant energy c) the movement of an electrical charge thermal energy d) potential energy stored in the bonds between atoms

Using this reversible reaction, answer the questions below: n2o4 2no2 (colorless) (reddish-brown) -as the temperature increased, what happened to the n2o4 concentration? -was the formation of reactants or products favored by the addition of heat? -which reaction is exothermic? right to left or left to right? -if the change of enthalpy of this reaction when proceeding left to right is 14 kcal, which chemical equation is correct? n2o4 2no2 + 14 kcal n2o4 2no2, hr = +14 kcal n2o4 + 14 kcal 2no2 n2o4 2no2, hr = -14 kcal