A 5.0-liter gas tank holds 1.7 moles of monatomic helium (He) and ...

[kwoodring]

A 5.0-liter gas tank holds 1.7 moles of monatomic helium (He) and 1.10 mole of diatomic oxygen (O2), at a temperature of 260 K.
 
  The ATOMIC masses of helium and oxygen are
  4.0 g/mol and 16.0 g/mol, respectively. What is the ratio of the root-mean-square (thermal) speed of helium to that of oxygen?
  A) 1.4
  B) 2.0
  C) 2.8
  D) 4.0
  E) 5.6

Question 2

An ideal gas is kept in a rigid container that expands negligibly when heated. The gas starts at a temperature of 20.0C, and heat is added to increase its temperature.
 
  At what temperature will its root-mean-square speed (thermal speed) be double its value at 20.0C?
  A) 40.0C
  B) 141C
  C) 313C
  D) 400C
  E) 899C

[wshriver]

Answer to Question 1

Answer: C

Answer to Question 2

Answer: E

[kwoodring]

Thanks

[wshriver]

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