Some texts use the kilogram-mole rather than the gram-mole. What ...

[lb_gilbert]

Some texts use the kilogram-mole rather than the gram-mole. What would be the values of the gas constant R and Avogadro's number NA using the kg-mole?
 
  What will be an ideal response?

Question 2

A bat, flying due east at 2 m/s, emits a shriek that is reflected back to it from an oncoming insect flying directly toward the bat at 4 m/s. The insect is 20 m from the bat at the instant the shriek is emitted. Sound travels 340 m/s in air.
 
  After what elapsed time does the bat hear the reflected echo?

[kardosa007]

Answer to Question 1

R = 8.31  103 J / (kg-mole) K
NA = 6.02  1026 (kg-mole)-1

Answer to Question 2

57 milliseconds

[lb_gilbert]

Excellent

[mcarey591]

Wow, this really help