Drugs used commonly by athletes and others to relieve pain include
A) ketoprofen.
B) heroin.
C) cocaine.
D) vitamin C.
Question 2
How many grams of calcium chloride are needed to produce 10.0 g of potassium chloride? CaCl2(aq) + K2CO3(aq) 2 KCl(aq) + CaCO3(aq)
A) 0.134 g
B) 7.44 g
C) 14.9 g
D) 29.8 g
Question 3
Sodium metal reacts with water to produce hydrogen gas and sodium hydroxide according to the chemical equation shown below. When 0.025 mol of Na is added to 100.00 g of water, the temperature of the resulting solution rises from 25.00C to 35.75C.
If the specific heat of the solution is 4.18 J/(g C), calculate H for the reaction, as written. 2 Na(s) + 2 H2O(l) 2 NaOH(aq) + H2(g) H= ? A) -5.41 kJ
B) -90.0 kJ
C) -180 kJ
D) -364 kJ
Question 4
How many grams of sodium chloride are there in 55.0 mL of a 1.90 M aqueous solution of sodium chloride?
A) 0.105
B) 6.11
C) 3.21
D) 6.11 103
E) 12.2