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Which of the following is a valid mole ratio associated with the combustion of pentane?

Assign oxidation numbers to each atom of the redox equation below (9 pts – 1 pt per ON).  In addition, identify the oxidizing and reducing agents (2 pts – 1 pt per agent). Just list the oxidation numbers in order from left to right in your answer space.  You don’t need to write them as superscripts, and you don’t need to rewrite the entire redox equation over.   4 ClO3-  +  3 N2H4      —–>      6 NO  +  4 Cl-  +  6 H2O  

Which of the following properties of a substance is intensive?

Complete the following table.  (1 pt each)   Isotopic Notation Atomic Number Mass Number   # protons # neutrons # electrons [atomic1] [mass1] [proton1] [neutron1] [electron1]

You find a bottle of phosphoric acid of unknown concentration in the lab stockroom.  To determine the concentration, you decide to perform a titration with 0.1388 M sodium hydroxide in the buret, starting with 25.00 mL of acid in the reaction flask along with some indicator solution.  The initial volume reading in the buret was 0.62 mL, and at the endpoint the final volume reading in the buret was 49.11 mL.  What is the concentration (in M) of the phosphoric acid solution?

Which of the following elements is tetratomic in its standard state?

Which of the following is a major product in the reaction of aqueous lithium bicarbonate and hydrochloric acid?

At a particular pressure and temperature, N2 gas effuses at a rate of 576 particles per second.  What is the effusion rate of sulfur hexafluoride gas at this same pressure and temperature?

What is the molarity of cesium cations if 89.1 grams of cesium phosphate is dissolved in enough water to prepare 825 mL of aqueous solution?

When the math expression below is simplified, how many sig figs should the result have?