What decimal power does the abbreviation pico represent? A) 1 ...

[lidoalex]

What decimal power does the abbreviation pico represent?
 
  A) 1  106
  B) 1  109
  C) 1  10-1
  D) 1  10-12
  E) 1  10-15

Question 2

Write a balanced equation to show the reaction of gaseous ethane with gaseous oxygen to form carbon monoxide gas and water vapor.
 
  A) 2 C2H6(g) + 7 O2(g)  4 CO2(g) + 6 H2O(g)
  B) C2H6(g) + 5 O(g)  2 CO(g) + 3 H2O(g)
  C) 2 C2H6(g) + 5 O2(g)  4 CO(g) + 6 H2O(g)
  D) C2H6(g) + 7 O(g)  2 CO2(g) + 3 H2O(g)
  E) 2 CH3(g) + 5 O(g)  2 CO(g) + 3 H2O(g)

Question 3

A gas mixture consists of N2, O2, and Ne, where the mole fraction of N2 is 0.55 and the mole fraction of Ne is 0.25. If the mixture is at STP in a 5.0 L container, how many molecules of O2 are present?
 
  A) 4.5  1022 molecules O2
  B) 2.7  1022 molecules O2
  C) 3.7  1023 molecules O2
  D) 1.1  1023 molecules O2
  E) 9.3  1024 molecules O2

[EAN94]

Answer to Question 1

D

Answer to Question 2

C

Answer to Question 3

B

[lidoalex]

Excellent

[Jossy]

Wow, this really help