How many mL of 16 M NH3 are needed to prepare 2.00 L of a 2.00 M ...

[s.tung]

How many mL of 16 M NH3 are needed to prepare 2.00 L of a 2.00 M solution?
 
  A) 250 mL
  B) 125 mL
  C) 16 mL
  D) 8.0 mL
  E) 4.0 mL

Question 2

Use the standard reaction enthalpies given below to determine Hrxn for the following reaction:
 
  P4(g) + 10 Cl2(g)  4PCl5(s) Hrxn = ?
 
  Given:
   PCl5(s)  PCl3(g) + Cl2(g) Hrxn= +157 kJ
   P4(g) + 6 Cl2(g)  4 PCl3(g) Hrxn = -1207 kJ
 
  A) -1835 kJ
  B) -1364 kJ
  C) -1050. kJ
  D) -1786 kJ
  E) -2100. kJ

Question 3

A gas at 25C exactly fills a container previously determined to have a volume of 1.05  103 cm3. The container plus gas are weighed and found to have a mass of 837.6 g. The container, when emptied of all gas, has a mass of 836.2 g.
 
  What is the density of the gas at 25C?

[Christopher]

Answer to Question 1

A

Answer to Question 2

A

Answer to Question 3

1.3  10-3 g/cm3

[s.tung]

TY

[Christopher]

You're welcome