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Consider the following equation.  2 H2 (g) + O2 (g)  –> 2 H2O (g)   If 8.00 moles of H2 (g) react fully with oxygen how many moles of water will be made? Assume an excess amount of Oxygen.  The answer must have the correct significant figures ( 1 pt) and unit ( 1 point) . Circle your final answer.  All work must be shown for credit. No work=no credit. All work must in your own hand-writing.  

Zinc metal reacts with aqueous hydrochloric acid to produce zinc chloride and hydrogen gas. Zn (s) + 2 HCl (aq) –>  ZnCl2 (aq)  +  H2 (g) What volume of 3.55 M HCl is required to produce 25.5 L of hydrogen gas at a temperature of 298 K and a pressure of 1.20 atm?   

When a gas condenses, it releases heat to its surroundings.  This is a(n)                             process.

Explain the difference between a saturated solution and a concentrated solution. 

Identify the BrØnsted base in this reaction.  H2O (l) + HNO3 (aq)  –>  H3O+ (aq)  + NO3- (aq)

Write  1) complete Ionic equation ( 4pts)  and 2) net ionic equation ( 4pts)  for this neutralization reaction: H2SO4 (aq)  + 2KOH(aq) –> K2SO4(aq)  + 2H2O(l)   All work must be shown for credit. No work=no credit. All work must in your own hand-writing.  

Ozone has the formula O3.  Which statement is correct concerning ozone?

The following 4 Essay questions require you to submit your work.  All work must be in your own handwriting.  The use of electronic devices, including writing tablets is not allowed.  No work= No credit.  Work must be neat and legible. If I cannot read it, you will not receive credit for it.  

A 25.0 mL sample of HBr is neutralized by reaction with 20.0 mL of 3.00 M KOH.  What is the concentration of HBr is the unknown sample? *hint- find the concentration of the base first. The answer must have the correct significant figures ( 1 pt) and unit ( 1 point) . Circle your final answer.  All work must be shown for credit. No work=no credit. All work must in your own hand-writing.  

The mixture of gas and air inside a cylinder reacts, releasing 400 kJ of total energy.  If the system does 250 kJ of work on the piston, how much energy is released as heat?