A solution contains 33 phosphoric acid by mass. This means that ...

[Yolanda]

A solution contains 33 phosphoric acid by mass. This means that ________.
 
  A) 100 g of this solution contains 33 g of phosphoric acid
  B) 1 mL of this solution contains 33 g of phosphoric acid
  C) 1 L of this solution has a mass of 33 g
  D) 1 L of this solution contains 33 mL of phosphoric acid
  E) the density of this solution is 3.3 g/mL

Question 2

One reaction that contributes to photochemical smog is shown below. Which of the species involved contains one or more unpaired electrons? NO2(g) + h NO(g) + O(g)
 
  A) only NO2(g)
  B) only NO2(g) and NO(g)
  C) only O(g)
  D) All of the above contain unpaired electrons.

Question 3

The nuclear disintegration series of ________ is the source of radon-222 in soil.
 
  A) 235U
  B) 238U
  C) 236Pb
  D) 235Th
  E) 14C

[covalentbond]

Answer to Question 1

A

Answer to Question 2

D

Answer to Question 3

B

[Yolanda]

Wow, this really help

[steff9894]

Gracias!