How many significant figures should be retained in the result of ...

[burton19126]

How many significant figures should be retained in the result of the following calculation? 12.00000  0.9893 + 13.00335  0.0107
 
  A) 2
  B) 3
  C) 4
  D) 5
  E) 6

Question 2

Vanadium has two naturally occurring isotopes, 50V with an atomic mass of 49.9472 amu and 51V with an atomic mass of 50.9440. The atomic weight of vanadium is 50.9415.
 
  The percent abundances of the vanadium isotopes are ________ 50V and ________ 51V. A) 0.25, 99.75
  B) 99.75, 0.25
  C) 49, 51
  D) 1.0, 99
  E) 99, 1.0

[krakiolit]

Answer to Question 1

B

Answer to Question 2

A

[burton19126]

Excellent

[nothere]

Gracias!