How many milliliters of a stock solution of 11.1 M HNO3 would be ...

[sammy]

How many milliliters of a stock solution of 11.1 M HNO3 would be needed to prepare 0.500 L of 0.500 M HNO3?
 
  A) 0.0444 mL
  B) 22.5 mL
  C) 2.78 mL
  D) 44.4 mL
  E) 0.0225 mL

Question 2

A motor does 30 kJ of work and loses 4 kJ as heat to the surroundings. What is the change in the internal energy of the motor?
 
  A) -34 kJ
  B) +34 kJ
  C) -26 kJ
  D) +26 kJ

Question 3

Hydrogen cyanide, HCN, is a weak acid. Which equation best represents its aqueous chemistry?
 
  A) HCN (aq) + H2O (l) CN- (aq) + H3O+ (aq)
  B) HCN (aq) + H2O (l) H2CN+ (aq) + OH- (aq)
  C) HCN (aq) H+ (aq) + CN- (aq)
  D) HCN (aq) H- (aq) + CN+ (aq)
  E) H2O (l) H+ (aq) + OH- (aq)

Question 4

A student prepared a stock solution by dissolving 10.0 g of KOH in enough water to make 150. mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution.
 
  What is the concentration of KOH for the final solution? A) 0.274 M
  B) 0.356 M
  C) 2.81 M
  D) 3.65 M

[joneynes]

Answer to Question 1

B

Answer to Question 2

A

Answer to Question 3

A

Answer to Question 4

A

[sammy]

Both answers were spot on, thank you once again

[joneynes]

Great! Please up vote