16) it takes 40.0 mL of 100 M NaOH to titrate 488 mg of a solid monoprotic acid to the phenolphthalein end point. What is the molecular mass of the acid?
A) 221
B) 122
C) 68
D) 1.2 x 10^5
E) 1.2 x 10^-1
29) A certain gas has a molar solubility in CCL4 of 2.7 x 10^-4 M when its pressure is 330 mm Hg. What is its solubility, at the same temperature, if the pressure of the gas is decreased to 220 mm Hg?
A) 221
B) 122
C) 68
D) 1.2 x 10^5
E) 1.2 x 10^-1
29) A certain gas has a molar solubility in CCL4 of 2.7 x 10^-4 M when its pressure is 330 mm Hg. What is its solubility, at the same temperature, if the pressure of the gas is decreased to 220 mm Hg?
-
16)
100 M/L * 40 ml * 1L/1000ml = 4 moles
4 moles = 488 =====> 1mole = 122
answer B)
100 M/L * 40 ml * 1L/1000ml = 4 moles
4 moles = 488 =====> 1mole = 122
answer B)