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Problem Solving Center
Cumulative Exam

1 .       Which number is incorrectly converted to standard exponential notation?

 



2 .       The mass of 236 mL of the liquid ethanol is found to be 186 g. What is the density of ethanol in g/mL? 



3 .       Convert 9.5 ft to cm. 



4 .       How many electrons, protons, and neutrons are in an atom of 7735X3-



5 .       Which name is incorrect



6 .       Which one of the following is improperly labeled? 



7 .       Calculate the formula weight of ammonium nitrate. 



8 .       The coefficients required to correctly balance the reaction below are

Al(NO3)3 + Na2S arrow.gif Al2S3 + NaNO3 



9 .       A reaction that produces crude iron from iron ore is shown below:

Fe2O3 (s) + 3CO (g) arrow.gif 2Fe (s) + 3CO2 (g)

How many moles of iron could be produced from the reaction of 10 mol Fe2O3 and 25 mol of CO? 



10 .       Octane burns according to the following equation:

2C8H18 + 25O2 arrow.gif 16CO2 + 18H2O

How many grams of CO2 are produced when 5.00 g of C8H18 are burned? 



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