The following questions deal with copper(II) sulfate. (a) In part B of this expe

Question

The following questions deal with copper(II) sulfate. (a) In part B of this experiment, you will use copper(II) sulfate pentahydrate. What is the molar mass of this compound?    Correct: Your answer is correct. g/mol
(b) How much of this compound must be weighed to make 125.0 mL of a 0.15 M solution? WebAssign will check your answer for the correct number of significant figures.    Incorrect: Your answer is incorrect. g
(c) How many mL of the 0.15 M solution should be diluted to prepare 250.0 mL of a 0.050 M solution? WebAssign will check your answer for the correct number of significant figures. mL
Additional Materials Solutions and Spectroscopy   
The following questions deal with copper(II) sulfate. (a) In part B of this experiment, you will use copper(II) sulfate pentahydrate. What is the molar mass of this compound?    Correct: Your answer is correct. g/mol
(b) How much of this compound must be weighed to make 125.0 mL of a 0.15 M solution? WebAssign will check your answer for the correct number of significant figures.    Incorrect: Your answer is incorrect. g
(c) How many mL of the 0.15 M solution should be diluted to prepare 250.0 mL of a 0.050 M solution? WebAssign will check your answer for the correct number of significant figures. mL
Additional Materials Solutions and Spectroscopy   
The following questions deal with copper(II) sulfate. (a) In part B of this experiment, you will use copper(II) sulfate pentahydrate. What is the molar mass of this compound?    Correct: Your answer is correct. g/mol
(b) How much of this compound must be weighed to make 125.0 mL of a 0.15 M solution? WebAssign will check your answer for the correct number of significant figures.    Incorrect: Your answer is incorrect. g
(c) How many mL of the 0.15 M solution should be diluted to prepare 250.0 mL of a 0.050 M solution? WebAssign will check your answer for the correct number of significant figures. mL
Additional Materials Solutions and Spectroscopy   

Explanation / Answer

1.molar mass of copper(II) sulfate pentahydrate = 249.5 g/mol [63.5+32+64+5*(18) = 249.5]

2. molarity = (mass/molarmass)*(1000/V in mL)

          0.15 = (mass/249.5)*(1000/125)

mass of compound = 4.7 grams

3. M1V1 = M2V2

0.15*V1 = 0.050*250

V1 = 83.3 mL

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