What mass (in g) of NH3 must be dissolved in 475 g of methanolto make a 0.250 m solution?

A. 2.02 g B. 4.94 g C. 1.19 g D. 8.42 g E. 1.90 g

Determine the vapor pressure of a solution at 25°C that contains76.6 g of glucose (C6H12O6.) in 250.0 mL ofwater. The vapor pressure ofpure water at 25°C is 23.8 torr and the density of water is 1g/mL.

A. 70.8 torr B. 72.9 torr C. 23.1torr D. 22.9 torr E. 7.29 torr

Determine the freezing point of asolution that contains 78.8 g of naphthalene (C10H8, molar mass =128.16 g/mol) dissolved in 722 mL of benzene (d = 0.877 g/mL). Purebenzene has a melting point of 5.50°C and a freezing pointdepression constant of 4.90°C/m.

A. 4.76°C B. 4.17°C C. 0.74°C D.1.33°C E. 1.68°C

Choose the aqueous solution withthe smallest osmotic pressure. Assume ideal van't Hoff factorswhere applicable.

A. 0.120 M C2H6O2 B. 0.040 M(NH4)2SO4 C. 0.060 M K2CO3 D. 0.030 M LiC2H3O2