a. Given the following equation, determine the mass of NaCl produced when 2 grams of Cl2 reacts: 2 Na + Cl2  2 NaCl (show all of your work) (ans: 3.29 g NaCl) b. Using the above reaction, determine the mass of Na needed if 5 grams of NaCl is produced. (show your work)

Astudent is trying to create a table that compares hypotheses, theories, and laws. hypothesis theory law do scientific researchers formulate it? yes yes yes does it explain why things happen? yes yes no yes yes yes is it used to make predictions? no yes yes which of the following questions would most likely fill the blank in the table? is it an intelligent guess? is it newly formulated? is it based on observations? has it been proved?

Consider the reaction: 2al(s) + fe2o3(s) → al2o3(s) + 2fe(s) the δhf for fe2o3(s) = -824.3 kj/mole. the δhf for al2o3(s) = -1675.7 kj/mole. finish the equation. δhrxn = [(1)( kj/mole) + (2)( kj/mole)] - [(1)( kj/mole) + (2) ( kj/mole)]

What are several ways to reduce the effect of friction