PLEASE ANSWER ALL ACCURATELY 1.) Compute the molality of each of the following a

Question

PLEASE ANSWER ALL ACCURATELY

1.) Compute the molality of each of the following

a. 0.55 mol solute; 0.350 kg solvent. Express your answer using two significant figures.

b. 0.922 mol solute; 0.250 kg solvent .Express your answer using three significant figures.

c. 0.010 mol solute; 25.1 g solvent .Express your answer using two significant figures.

2.)A 125 mL sample of an 9.5 M NaCl solution is diluted to 2.0 L . What volume of the diluted solution contains 10.8 g of NaCl? Express your answer using two significant figures.

Explanation / Answer

1) A. Molality = no. of moles of solute/ mass of solvent in kg

Molality = 0.55/0.350 = 1.57 molal

b. molality= 0.922/0.25 = 3.7 molal

c, mollaity = 0.010/(25.1/1000) = 0.4 molal

2) M1V1=M2V2
M1*2000 = 9.5*125
M1 = 0.59M

Molar mass NaCl=58.44g/mol
Mass NaCl in 1,000mL of solution = 58.44*0.59 = 34.7g

Volume that contains 10.8g = 10.8/34.7*1000 = 437.24mL

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