How many of the following numbers contain 3 significant figures? ...

[PhilipSeeMore]

How many of the following numbers contain 3 significant figures? 0.408 9.040 0.0400 9.05  1024
 
  A) one
  B) two
  C) three
  D) four

Question 2

How many of the following species are diamagnetic? Cs Zr2+ Al3+ Hg2+
 
  A) 1
  B) 3
  C) 0
  D) 2
  E) 4

Question 3

Determine the total pressure of all gases (at STP) formed when 50.0 mL of TNT (C3H5(NO3)3, d = 1.60 g/mL, molar mass = 227.10 g/mol) reacts according to the following reaction.
 
  4 C3H5(NO3)3(l)  6 N2(g) + O2(g) + 12 CO2(g) + 10 H2O(g)
 
  A) 4.93 L
  B) 57.2 L
  C) 29.6 L
  D) 448 L
  E) 175 L

Question 4

What is the chemical symbol for mercury?
 
  A) Ag
  B) Au
  C) Hg
  D) Pb

[leannegxo]

Answer to Question 1

C

Answer to Question 2

D

Answer to Question 3

B

Answer to Question 4

C

[PhilipSeeMore]

Wow, this really help

[helenmarkerine]

Great answer, keep it coming