Homework Answers
1. Formula of alum = KAl(SO4)2.12 H2O
Mass of water = 12 * 18 = 216 amu
Mass of Alum salt = 39 + 27 + 2 * (32 + 4 * 16) + 12 * 18 = 474 amu
Fraction of water in alum = mass of water / mass of alum = 216 / 474 = 0.456
Fraction that is not water = 1 - 0.456 = 0.544
Mass of dehydrated salt = 0.544 * mass of hydrated salt = 0.544 * 100 = 54.4 g
2. CuSO4. 5 H2O
Mass of water = 5 * 18 = 90 amu
mass of the salt = 63.5 + 32 + 4 * 16 + 90 = 249.5 amu
Mass % of water = mass of water * 100 / mass of salt= 90 * 100 / 249.5 = 36.15%
3. Hydrate : The form of a salt that contains water molecules in the molecular formula
Anhydrous salt: The form of salt that does not contain water molecules as part of it's moleculuar formula
Water of Hydration : the number of water molecules per formula unit of the hydrate salt
% error = theoretical value - practical value / theoretical value * 100
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Show all your mork! LUse proper units and significant figures!! What will be the mass of...
Data Table Aluminum cup leppty). 2.5 Aluminum cup + approx. 2g alum, & Show you calculations...
Data Table Aluminum cup leppty). 2.5 Aluminum cup + approx. 2g alum, & Show you calculations in this column 4.5 3.6| 3.6| Aluminum cup + alum after 1* heating, 8 20 heating, E Mass of released water, g Mass of anhydrous alum, & Molar mass of water, g/mol Molar mass of ahnydrous alum, g/mol Number of moles of water released Number of moles of anhydrous alum Experimental mole ratio water to alum, x Literature value of x Percent error Past...
percent error #3 Calculations for Part 2 Ou in KAl(SO4)2 1. Experimental value for percent sulfate...
percent error #3
Calculations for Part 2 Ou in KAl(SO4)2 1. Experimental value for percent sulfate in alum BA 0.15793504) H20 12 ( 18.0a)= 216.24 KAYS0y), 12H20 MM (504)₂ = 64.327 128.00 2 = 192.32 glmor 2. Theoretical value for percent sulfate in alum are monologa dobar odbud 3. Percent error Results and Data Analysis Table 1: Determination of the Water of Hydration in Alum Crystals Mass of crucible + cover + alum 43.10509 - water Mass of crucible +...
please help me solve all 3! Thank you in advance A 15.67 g of a hydrate...
please help me solve all 3! Thank you in advance
A 15.67 g of a hydrate of magnesium carbonate was carefully heated to drive off the waters of hydration. The mass was reduced to 7.58 g after the water was driven off. What is the molecular formula of this hydrate? Complete the molecular formula by choosing the appropriate coefficient below: MgCoz v H20 Checl OVO AWN Next page Silver nitrate has the molecular formula AgNO3. In a 216.8 g sample...
Need all calculations. Please make sure to make a table and show all working thanks A clean and empty beaker has a mass...
Need all calculations. Please make sure to make a table and show
all working thanks
A clean and empty beaker has a mass of 12.784 g. The beaker and hydrate have a mass of 15.895 g. After heating, the beaker and anhydrous salt have a mass of 13.889 g. What is the formula of this hydrate of magnesium sulfate MgSO4 ? H2O ? H20 18.01 g/mol MgSO4 120.37 g/mol 12.784 g Mass of Beaker 1. 2. Mass of Beaker and...
i need help with questions A-E please The Mole Concept: Chemical Formula of a Hydrate- Lab...
i need help with questions A-E please
The Mole Concept: Chemical Formula of a Hydrate- Lab Report Assistant Exercise 1: Water of Hydration Data Table 1. Alum Data. Object Mass (g) Aluminum Cup (Empty) 3 Aluminum Cup +2.00 grams of Alum5 Aluminum Cup + Alum After 1 Heating 4.44 Aluminum Cup + Alum After 2 Heating 3.52 Mass of Released HO 1.48 Molecular Mass of H,0 18.015 Moles of Released H,0 OU54 Questions: A) Calculate the moles of anhydrous (dry)...
Experiment 6 PRE-LABORATORY PROBLEMS NAME 1. Write a purpose statement and a summary of the procedure...
Experiment 6 PRE-LABORATORY PROBLEMS NAME 1. Write a purpose statement and a summary of the procedure to include special technique equipment, chemicals, and chemical reactions to be performed, an understanding of any calculations that are important to understanding the procedure. 2. Calculate the molar mass of copper (II) Sulfate pentahydrate, Cuso,5H.O. 3. Calculate the mass percent of water present in Copper(II) sulfate pentahydrate. 4. Define the term hydrate and anhydrous. S. A 2.000 gram sample of hydrated barium carbonate was...
please answer all, and type please Problems and questions (show all calculations, correct significant figures and...
please answer all, and type please
Problems and questions (show all calculations, correct significant figures and units) 1. Why is it important to test the crucible for cracks before heating it? 2. Write the correct balanced equation for the dehydration (removal of water) of the magnesium sulfate hydrate obtained in Procedure B of this experiment. 3. How many moles are in 70.0 grams of potassium hydroxide? 4. A compound is formed when 0.300 moles of barium combine with 0.600 moles...
I really need help understanding the second question? 2.) calculate the percent mass in your hydrate....
I really need help understanding the second question?
2.) calculate the percent mass in your hydrate. If the
copper(ii) sulfate hydrate should contain 36.08% by mass of water,
what is the % error of your experimental result?
4. Decant about 1/4 of the solution into another clean test tube. In the fume hood, carefully add I drop of concentrated ammonium hydroxide (aqueous ammonia) into the test tube and gently swirl. KEEP YOUR NOSE AWAY FROM THE AQUEOUS AMMONIA FUMES! Record...
Mass of crucible and cover (g) 31.507 Mass of crucible, cover, and alum before heating (g) Mass o...
Mass of crucible and cover (g) 31.507 Mass of crucible, cover, and alum before heating (g) Mass of crucible, cover, and alum after 1st heating (g) 1 Mass of crucible, cover, and alum after 2nd heating (g) | Mass of crucible, cover, and alum after 3rd heating (g) Mass of anhydrous alum (g) 3 2, C 2 DATA ANALYSIS Based on your experimental data, calculate the percent water in your sample. 2. Based on your experimental data calculated the value...
Show calculations for items in bold. Re mindful of significant figures for full credit. Value Measurement Mass of c...
Show calculations for items in bold. Re mindful of significant figures for full credit. Value Measurement Mass of crucible (1 pt.) 15. 55% 3 Mass of crucible and copper chloride hydrate (1 pt.) 16.5549 Mass of copper chloride hydrate (4 pt.) Mass of crucible and anhydrous copper chloride (1 pt.) 16.2963 o.25%9 Mass of anhydrous copper chloride (4 pt.) Mass of filter paper and watchglass (1 pt.) S2-7069 Mass of filter paper and watchglass and copper collected (1 pt.) Mass...
Data Table Aluminum cup leppty). 2.5 Aluminum cup + approx. 2g alum, & Show you calculations in this column 4.5 3.6| 3.6| Aluminum cup + alum after 1* heating, 8 20 heating, E Mass of released water, g Mass of anhydrous alum, & Molar mass of water, g/mol Molar mass of ahnydrous alum, g/mol Number of moles of water released Number of moles of anhydrous alum Experimental mole ratio water to alum, x Literature value of x Percent error Past...
percent error #3
Calculations for Part 2 Ou in KAl(SO4)2 1. Experimental value for percent sulfate in alum BA 0.15793504) H20 12 ( 18.0a)= 216.24 KAYS0y), 12H20 MM (504)₂ = 64.327 128.00 2 = 192.32 glmor 2. Theoretical value for percent sulfate in alum are monologa dobar odbud 3. Percent error Results and Data Analysis Table 1: Determination of the Water of Hydration in Alum Crystals Mass of crucible + cover + alum 43.10509 - water Mass of crucible +...
please help me solve all 3! Thank you in advance
A 15.67 g of a hydrate of magnesium carbonate was carefully heated to drive off the waters of hydration. The mass was reduced to 7.58 g after the water was driven off. What is the molecular formula of this hydrate? Complete the molecular formula by choosing the appropriate coefficient below: MgCoz v H20 Checl OVO AWN Next page Silver nitrate has the molecular formula AgNO3. In a 216.8 g sample...
Need all calculations. Please make sure to make a table and show
all working thanks
A clean and empty beaker has a mass of 12.784 g. The beaker and hydrate have a mass of 15.895 g. After heating, the beaker and anhydrous salt have a mass of 13.889 g. What is the formula of this hydrate of magnesium sulfate MgSO4 ? H2O ? H20 18.01 g/mol MgSO4 120.37 g/mol 12.784 g Mass of Beaker 1. 2. Mass of Beaker and...
i need help with questions A-E please
The Mole Concept: Chemical Formula of a Hydrate- Lab Report Assistant Exercise 1: Water of Hydration Data Table 1. Alum Data. Object Mass (g) Aluminum Cup (Empty) 3 Aluminum Cup +2.00 grams of Alum5 Aluminum Cup + Alum After 1 Heating 4.44 Aluminum Cup + Alum After 2 Heating 3.52 Mass of Released HO 1.48 Molecular Mass of H,0 18.015 Moles of Released H,0 OU54 Questions: A) Calculate the moles of anhydrous (dry)...
Experiment 6 PRE-LABORATORY PROBLEMS NAME 1. Write a purpose statement and a summary of the procedure to include special technique equipment, chemicals, and chemical reactions to be performed, an understanding of any calculations that are important to understanding the procedure. 2. Calculate the molar mass of copper (II) Sulfate pentahydrate, Cuso,5H.O. 3. Calculate the mass percent of water present in Copper(II) sulfate pentahydrate. 4. Define the term hydrate and anhydrous. S. A 2.000 gram sample of hydrated barium carbonate was...
please answer all, and type please
Problems and questions (show all calculations, correct significant figures and units) 1. Why is it important to test the crucible for cracks before heating it? 2. Write the correct balanced equation for the dehydration (removal of water) of the magnesium sulfate hydrate obtained in Procedure B of this experiment. 3. How many moles are in 70.0 grams of potassium hydroxide? 4. A compound is formed when 0.300 moles of barium combine with 0.600 moles...
I really need help understanding the second question?
2.) calculate the percent mass in your hydrate. If the
copper(ii) sulfate hydrate should contain 36.08% by mass of water,
what is the % error of your experimental result?
4. Decant about 1/4 of the solution into another clean test tube. In the fume hood, carefully add I drop of concentrated ammonium hydroxide (aqueous ammonia) into the test tube and gently swirl. KEEP YOUR NOSE AWAY FROM THE AQUEOUS AMMONIA FUMES! Record...
Mass of crucible and cover (g) 31.507 Mass of crucible, cover, and alum before heating (g) Mass of crucible, cover, and alum after 1st heating (g) 1 Mass of crucible, cover, and alum after 2nd heating (g) | Mass of crucible, cover, and alum after 3rd heating (g) Mass of anhydrous alum (g) 3 2, C 2 DATA ANALYSIS Based on your experimental data, calculate the percent water in your sample. 2. Based on your experimental data calculated the value...
Show calculations for items in bold. Re mindful of significant figures for full credit. Value Measurement Mass of crucible (1 pt.) 15. 55% 3 Mass of crucible and copper chloride hydrate (1 pt.) 16.5549 Mass of copper chloride hydrate (4 pt.) Mass of crucible and anhydrous copper chloride (1 pt.) 16.2963 o.25%9 Mass of anhydrous copper chloride (4 pt.) Mass of filter paper and watchglass (1 pt.) S2-7069 Mass of filter paper and watchglass and copper collected (1 pt.) Mass...
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