Makeup on Forms to express the Concentration

What is the molarity of 0.195 g of cholesterol (C27H46O) in 0.10 L of blood serum?

(Atomic weights: C = 12.01, H = 1.008, O = 16.00).

• 5.0

• 10^-3

• 5.0 x 10^-3

• None of them

The lowest limit of taste of MgSO4 in water is 0.040 g in 0.10 L. What is the molarity of MgSO4?

(Atomic weights: Mg = 24.30, S = 32.06, O = 16.00).

• 0.0033

• 0.033

• 0.33

• 33

Calculate the molarity of a solution of 0.0716 g of KMnO4 in 2.50 mL of solution.

(Atomic weights: K = 39.09, Mn = 54.94, O = 16.00).

• 0.181 M

• 181 M

• 1.81 M

• 18.1 M

What is the molality of a solution prepared by dissolving 5.00 g of chlorobenzene, C6H5Cl, in 115 g of benzene,

C6H6?

(Atomic weights: C = 12.01, H = 1.008, Cl = 35.45).

• 0.386 m

• 386 m

• 3.86 m

• 38.6 m

A 0.200 m solution of sucrose, C12H22O11, must be prepared. What mass (g) of sucrose must be dissolved in 250.0 g of water?

(Atomic weights: C = 12.01, H = 1.008, O = 16.00).

• 17.1 g

• 1.71 g

• 171 g

• 0.171 g

What is the mole fraction of Pb(NO3)2 in a solution prepared from 0.0543 moles of Pb(NO3)2 and 4.55 moles of water?

(Atomic weights: Pb = 207.2, N = 14.01, O = 16.00).

• 0.0118

• 118

• 0.000001180

• 0.000118

What is the mole fraction of C6H4Cl2 in a solution of 1.50 g C6H4Cl2 in 35.0 g of C6H6?

(Atomic weights: C = 12.01, H = 1.008, Cl = 35.45).

• 0.0223

• 0.223

• 223

• 2.23

A solution is prepared from 112 g of glucose, C6H12O6, and 100.0 mL of water (water density is 1 g/mL). What is the mole fraction of glucose?

(Atomic weights: C = 12.01, H = 1.008, O = 16.00).

• 0.100

• 100

• 0.000100

• 10

A solution is prepared by mixing 2.2 moles of CH2Cl2, 1.2 moles of CH2Br2 and 1.8 moles of CHCl3. What is the mole fraction of CH2Br2?

(Atomic weights: C = 12.01, H = 1.008, Cl = 35.45, Br = 79.9).

• 0.23

• 0.00023

• 2.3

• 230

Dissolving is...

• the process of mixing evenly and completely
• the process of reacting with water
• the process of disappearing
• the process of changing from a solid to a liquid