Chemistry Project/ Gas Law Review

Chemistry Project/ Gas Law Review

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  • Hello, My Name is Mrs. Naomi. I will be you guys chemistry teacher this school year. 
  • Welcome Back Students! 
  • Mrs. Naomi seems like a very nice.
  • I agree, this year won't be so bad. 
  • Objective:  Today we will be learning how to compare Effusion Rates. Do Now : How much faster does Helium (He) effuse than nitrogen ( N2 ) at the same temperature? 
  • The knowns are MOLAR MASS He=4.0g   MOLAR MASS N(2)= 28.0g 
  • The unknown of this equation is the ratio of effusion. 
  • Helium effuses nearly 3x faster than nitrogen at the same tempertature. 
  • To solve the problem we have to use Graham's Law of effusion. 
  • Using molar mass and rate. 
  • Okay, now you will substitute the molar masses of nitrogen & helium. 
  • Rate of Helium over rate of nitrogen will equal mass of nitrogen2 
  • once you have the equation you will solve. 
  • You will then cancel g which is grams and divide 28 by 4 and you will get 7.0= 2.7
  • You will then plug in 4.0g for rate of N2 and then you will put in 28.0g for the Ratehe
  • Well Done Students! You all have mastered Graham's Law!
  • That wasn't so hard, this year will be a breeze. 
  • I actually like this way of being taught, what a good lesson!
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