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Author Question: A refrigerator has an interior volume of 0.500 m3. The temperature inside the refrigerator in 282 K, ... (Read 118 times)

elizabeth18

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A refrigerator has an interior volume of 0.500 m3. The temperature inside the refrigerator in 282 K, and the pressure is 101 kPa. If the molecular weight of air is 29 g/mol, what is the mass of air inside the refrigerator? (R = 8.31 J/mol  K)
 
  A) 625 g
  B) 513 g
  C) 447 g
  D) 329 g
  E) 243 g

Question 2

Suppose the half-life of an isotope is 2 days. You purchase 10 grams of the isotope, but it was produced in a laboratory 4 days before it was delivered to you. How much of this isotope will you have 3 days after it was delivered to you?
 
  A) more than 2.5 grams but less than 5 grams
  B) 2.5 grams
  C) more than 1.25 grams but less than 2.5 grams
  D) 1.25 grams
  E) less than 1.25 grams


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peter

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elizabeth18

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Both answers were spot on, thank you once again




 

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