3. (5 pts) A solution was prepared by transferring 0.661 g of KSO to a 250.0-ml...

Question

Question

3. (5 pts) A solution was prepared by transferring 0.661 g of KSO to a 250.0-ml volumetric flask (container 1) and adding wat

science chemistry

Add a comment Improve this question Transcribed image text

Answer 1

Answer #1

Answer 3-

Given,

Initial mass of K₂SO₄ = 0.661 g

Molar mass of K₂SO₄ = 174.259 g/mol

Volume = 250 ml or 0.25 L [1 ml = 0.001 L]

Dilution 1 - 1.000 ml sample and volume 500 ml or 0.5 L

Dilution 2 - 10.0 ml sample and volume 250 ml or 0.25 L

Final Concentration = ?

We know that,

Molarity = Mole /Volume in L

Also,

Moles = Mass/Molar Mass

So,

Molarity = Mass/(Molar Mass * Volume in L)

Put the value,

Molarity = 0.661 g/(174.259 g/mol * 0.25 L)

Molarity = 0.015 M

Now,

M₁V₁ = M₂V₂

M₁ andM₂ are Molarity

V₁ and V₂ are volumes

For Dilution 1

M₁V₁ = M₂V₂

0.015 M * 0.001 L = M₂ * 0.5 L

M₂ = 0.00003 M

For Dilution 2

M₁V₁ = M₂V₂

0.00003 M * 0.01 L = M₂ * 0.25 L

M₂ = 0.0000012 M or 1.2 * 10^-6 M [Answer]

The final concentration is 1.2 * 10^-6 M [Answer]

Answer 4 -

Isotopes of Mo = 7

Mass Number	Exact Weight	Percentage abundance
92	91.906808	14.84
94	93.905085	9.25
95	94.905840	15.92
96	95.904678	16.68
97	96.906020	9.55
98	97.905406	24.13
100	99.907477	9.63

We know that,

Average atomic Mass = f1 M1 + f2 M2 + f3 M3 + . . . + fn Mn

where, f1, f2, f3, . . . , fn are fraction of abundance

M1, M2, M3, . . . , Mn are Mass of isotopes

Fraction abundance = % abundance/ 100

Mass Number	Exact Weight	Percentage abundance	Fraction Abundance
92	91.906808	14.84	0.1484
94	93.905085	9.25	0.0925
95	94.905840	15.92	0.1592
96	95.904678	16.68	0.1668
97	96.906020	9.55	0.0955
98	97.905406	24.13	0.2413
100	99.907477	9.63	0.0963

Put the values,

Average atomic Mass = f1 M1 + f2 M2 + f3 M3 + . . . + fn Mn

Average atomic Mass = (0.1484*91.906808)+(0.0925*93.905085)+(0.1592*94.905840)+(0.1668*95.904678)+(0.0955*96.906020)+(0.2413*97.905406)+(0.0963*99.907477)

Average atomic Mass = 95.931290101 u [Answer]

Add a comment

Answer 2

Similar Homework Help Questions

A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then...

A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then transferring to a 50.00 mL volumetric flask with orthophenanthroline as a complexing agent. At a wavelength of 540 nm, the absorbance of the standard was 0.239 in a 1.00 cm cuvette. A 0.149 g sample of an iron ore was crushed and digested in 5 mL of concentrated acid. The digested sample was then transferred to a 10.00 mL volumetric flask and diluted to...
0.3926 g of salicylic acid is dissolved in water and made up to 250.0 mL in a volumetric flask. Then, 4.00 mL of th...

0.3926 g of salicylic acid is dissolved in water and made up to 250.0 mL in a volumetric flask. Then, 4.00 mL of this solution is pipetted into a 50.0 mL volumetric flask and diluted with water to the mark. What is the final salicylic acid concentration?
0.3856 g of salicylic acid is dissolved in water and made up to 250.0 mL in a volumetric flask. Then, 3.00 mL of th...

0.3856 g of salicylic acid is dissolved in water and made up to 250.0 mL in a volumetric flask. Then, 3.00 mL of this solution is pipetted into a 50.0 mL volumetric flask and diluted with water to the mark. What is the final salicylic acid concentration?

The recommended procedure for preparing a very dilute solution is not to weigh out a very...

The recommended procedure for preparing a very dilute solution is not to weigh out a very small mass or measure a very small volume of stock solution. Instead, it is done by a series of dilutions. A sample of 0.8521 g of KMnO4 was dissolved in water and made up to the volume in a 500.0−mL volumetric flask. A 2.000−mL sample of this solution was transferred to a 1000−mL volumetric flask and diluted to the mark with water. Next, 10.00...
1) A Na3PO4 standard solution is prepared by transferring 3.50 g of primary standard-grade sodium carbonate...

1) A Na3PO4 standard solution is prepared by transferring 3.50 g of primary standard-grade sodium carbonate to a 500.0-mL volumetric flask, dissolving the sample in ~250 mL of distilled deionized water and diluted to the mark. A 50.00-mL aliquot is taken and titrated with 46.65 mL of HCl solution. Calculate the concentration of the HCl solution. please show your work clear and net answer 2) If the measured potential of a half-cell is 0.584 V when measured against the S.C.E,...
A solution of sodium was prepared by dissolving 0.0309 g of NaCl in distilled deionized water...

A solution of sodium was prepared by dissolving 0.0309 g of NaCl in distilled deionized water and brought up to the mark in a 200 mL volumetric flask. 10.0 mL of this solution was diluted to 250.0 mL. What is the concentration (ppm) of sodium the final solution

A Na_2CO_3 standard solution is prepared by transferring 2.4817 g of primary standard grade sodium carbonate...

A Na_2CO_3 standard solution is prepared by transferring 2.4817 g of primary standard grade sodium carbonate into a 250.0 mL volumetric flask, dissolving the sample in ~ 100 mL of distilled deionized water, and diluting to the mark. A 25.00 mL aliquot is taken and titrated with 42.65 mL of HCI solution. Calculate the concentration of the HCI solution. (Molar masses are: Na_2CO_3 = 105.989 g/mole; HCI = 36.461 g/mole; H_2O = 18.015 g/mole.) Circle the best choice. (Showing calculations...
Question 1 2 pts 3.34 mL of an unknown glucose solution was diluted in a 100.00 mL of volumetric flask with distill...

Question 1 2 pts 3.34 mL of an unknown glucose solution was diluted in a 100.00 mL of volumetric flask with distilled water. 10mL of that solution and 4.00 mL of the ferricyanide reagent was placed in a second 100.00 mL volumetric flask and diluted to the mark with distilled water. Spectrophotometric analysis of the glucose/ferricyanide solution showed that the concentration of glucose was 0.070 M. What is the concentration of glucose in the unknown solution?
Question 1 2 pts 3.34 mL of an unknown glucose solution was diluted in a 100.00 mL of volumetric flask with distill...

Question 1 2 pts 3.34 mL of an unknown glucose solution was diluted in a 100.00 mL of volumetric flask with distilled water. 10mL of that solution and 4.00 mL of the ferricyanide reagent was placed in a second 100.00 mL volumetric flask and diluted to the mark with distilled water. Spectrophotometric analysis of the glucose/ferricyanide solution showed that the concentration of glucose was 0.070 M. What is the concentration of glucose in the unknown solution?

A penny having a mass of 2.5340 g was dissolved in 20 mL of 8 M HNO3. The resulting solution was transferred to a 100.00-ml volumetric flask and diluted to the mark with water.

A penny having a mass of 2.5340 g was dissolved in 20 mL of 8 M HNO3. The resulting solution was transferred to a 100.00-ml volumetric flask and diluted to the mark with water. Then, a sample solution was prepared by transferring 10.00 mL of this solution to a 25.00- ml volumetric flask, adding 2.00 mL of 15 M NH3 and diluting to the mark with waterThe concentration of [Cu(NH3)4]2+ in the sample solution (determined using a Spectro Vis spectrophotometer)...

3. (5 pts) A solution was prepared by transferring 0.661 g of KSO to a 250.0-ml...

Homework Answers

Add Answer to:
3. (5 pts) A solution was prepared by transferring 0.661 g of KSO to a 250.0-ml...

Post as a guest

Earn Coins

A standard iron solution was prepared by dissolving 0.0100 g of pure iron in acid then...

0.3926 g of salicylic acid is dissolved in water and made up to 250.0 mL in a volumetric flask. Then, 4.00 mL of th...

0.3856 g of salicylic acid is dissolved in water and made up to 250.0 mL in a volumetric flask. Then, 3.00 mL of th...

The recommended procedure for preparing a very dilute solution is not to weigh out a very...

1) A Na3PO4 standard solution is prepared by transferring 3.50 g of primary standard-grade sodium carbonate...

A solution of sodium was prepared by dissolving 0.0309 g of NaCl in distilled deionized water...

A Na_2CO_3 standard solution is prepared by transferring 2.4817 g of primary standard grade sodium carbonate...

Question 1 2 pts 3.34 mL of an unknown glucose solution was diluted in a 100.00 mL of volumetric flask with distill...

Question 1 2 pts 3.34 mL of an unknown glucose solution was diluted in a 100.00 mL of volumetric flask with distill...

A penny having a mass of 2.5340 g was dissolved in 20 mL of 8 M HNO3. The resulting solution was transferred to a 100.00-ml volumetric flask and diluted to the mark with water.

3. (5 pts) A solution was prepared by transferring 0.661 g of KSO to a 250.0-ml...

Homework Answers

Add Answer to: 3. (5 pts) A solution was prepared by transferring 0.661 g of KSO to a 250.0-ml...

Post as a guest

Earn Coins

Add Answer to:
3. (5 pts) A solution was prepared by transferring 0.661 g of KSO to a 250.0-ml...