The pressure of a gas sample is measured with an open-ended manometer containing mercury, with the mercury level on the far side (towards the opening) 13.7 mm higher than the nearer side (towards the gas sample).  If the pressure of the gas sample is 787.5 mm Hg, what is the barometric pressure, in atm?

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

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?

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?

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

Provide the missing systematic chemical name or chemical formula for the following substances.  Spelling counts.  When entering formulas, all numbers will be assumed to be subscripts.  Include states of matter such as (g) and (aq) ONLY when the state of matter affects the name of the compound.  (1 pt each) Problem # Systematic Chemical Name Chemical Formula A [namea] C2H6 B lead (II) acetate [formulab] C [namec] Ca(NO3)2 

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

The density of a certain object is 2.588 g/mL.  You completely submerge the object in a graduated cylinder containing 68.9 mL of water, and observe the water level rise up to 74.3 mL.  What is the mass of the object, in g?

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?

[EXTRA CREDIT] (3 pts possible, question will show as being out of 0 pts) Magnesium nitride reacts with water to produce ammonia and magnesium hydroxide.  How many grams of magnesium hydroxide are produced when 100.00 grams of each reactant are combined, if the percent yield of magensium hydroxide is 76.7%? Show all work, using dimensional analysis, and highlight your answer in a readable background color.