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In an experiment 0.500 g of nickel were found to react with 0.204 g of oxygen.  What is the  empirical formula for this compound? 

CBr4

What is the percent composition of Al2(SO4)3 ?  Round molar masses to 2 decimal places.

If you have 5.0 moles of laughing gas (N2O) at STP, how many liters would this be?  Report to proper number of significant figures.

You and your friends are having a summer picnic. All of a sudden a half of a mole of ants invades your picnic. Which of the following statements is FALSE?

CONGRATULATIONS… You finished the Exam and our Course!!   Before submitting your Exam, please make sure you:  Rip up your scrap paper, Periodic Table & Ion Chart in front of the WebCam.  Submit your Exam.   It has been a pleasure having you in class and I wish you the best as you continue your studies!  Enjoy the holidays–stay safe and healthy!! Hope to have you in class again!!

Balance the following chemical equation: Al + O2 —-> Al2O3

How many valence electrons does cesium (Cs) have?

EXTRA CREDIT from Revell eText:   (1)  Briefly explain how a treatment for bipolar disorder was discovered? (2)  What is an aspect of what medicinal chemists do as part of their job? (3)  What was the starting material for the beautiful white plaster finish the Mayans used to make the buildings? (4) Why did the Mayans clear huge areas of the Yucatan Jungle that ultimately led to widespread drought and is possibly a reason for the decline in Mayan population? (5)  What do process chemists do? (6)  What was one of the two problems Eli Lilly chemists faced in producing a promising new medicine?

What type of chemical reaction does the following unbalanced chemical equation represent? Al + HCl —-> AlCl3 + H2