Stoichiometry Yield Problem

Stoichiometry Yield Problem – 3

Read the following letter. You will reply with a well-crafted letter. You will be graded on both the chemistry content as well as the quality of your writing and critical thinking skills, according to the school’s critical thinking rubric. Remember, you are writing a letter, not an essay! Your answers should be typed and your own work.

Be sure that you:
⦁ Tell the individual what he has done incorrectly
⦁ Explain how the mistakes can be corrected
⦁ Write down which version of this you have
Have fun with this!
March 11, 2019

Dear FHS Chemistry student:
My name is Barry. I am a chemist who lives in town. If I recall, you were on a T-ball team with my twins Sodi and Lithi Um. I have a chemistry problem I can’t seem to figure out, and I was told you were the person to ask for help. I need to make 50.0 g of copper (I) oxide using this equation: Cu + O2 CuO2. I am using a stoichiometry calculation like I’m sure you have learned, to find out how much iron I have to use:


Since I know for a fact that this reaction has a yield of only 72.0%, I ran the reaction with 47.5 grams of Cu to compensate (34.2 / .720 = 47.5).
OK, now here’s my problem: I have run this reaction in the lab at work many many times, using 47.5 grams of copper, and I never make enough CuO2 ! This is driving me crazy and may cost me my job. Sodi and Lithi both want to go to college, so I cannot afford to be fired.
Please tell me what I am doing wrong, and how I can fix this so that I can make 50.0 grams of copper (I) oxide to keep my boss happy.

Thanks so much,

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