![hanchinsko12](/avatars/5891.jpg)
hanchinsko12
13.06.2020 •
Chemistry
1- Alum used in cooking is potassium aluminum sulfate hydrate, KAl(SO4)2. XH2O. To find the value of X, you can heat the sample of compound. Assume you heat 4.74 g of the hydrated compound and that sample loses 2.16 g of water. What is the value of X
Solved
Show answers
More tips
- F Food and Cooking Apple Cider Vinegar: The Ultimate Health and Beauty Solution...
- C Computers and Internet Е-head: How it Simplifies Life for Users?...
- F Family and Home How to Choose the Best Diapers for Your Baby?...
- F Family and Home Parquet or laminate, which is better?...
- L Leisure and Entertainment How to Properly Wind Fishing Line onto a Reel?...
- L Leisure and Entertainment How to Make a Paper Boat in Simple Steps...
- T Travel and tourism Maldives Adventures: What is the Best Season to Visit the Luxurious Beaches?...
- H Health and Medicine Kinesiology: What is it and How Does it Work?...
- O Other How to Choose the Best Answer to Your Question on The Grand Question ?...
- L Leisure and Entertainment History of International Women s Day: When Did the Celebration of March 8th Begin?...
Answers on questions: Chemistry
- C Chemistry Consider the following intermediate chemical equations. 2H (g) + O2(g) → 2H, O( H (9)+F (9) ► 2HF(g) In the final chemical equation, HF and O2 are the products that...
- C Chemistry JOIN MY MEETINGID-9384026088PASSWORD 1234...
- C Chemistry A graph of ln k vs. 1/T is plotted and the linear trendline has an equation of y = –5773x + b. Please calculate the activation energy in units of kJ/mol. HELP...
- C Chemistry Chert forms when the tiny shells of marine organisms accumulate on the bottom of the ocean floor. true or false...
- C Chemistry When you buy isopropanol, commonly known as rubbing alcohol, it is a dilution. What volume of isopropanol is in 250 mL of a 70% solution?...
- C Chemistry What are the advantages of using a pig’s heart to create a human heart versus growing a heart directly from stem cells?( this is science btw )...
- E English How is a tsunami different from an earthquake?...
- H History On the western front during world war ii, us and british troops began their final push toward germany...
- E English An article in the local paper is discussing a new copper mine in new mexico. it states that all that is needed to identify a substance is the mass and volume of a sample....
- S Social Studies One item that was never traded by native americans was ?...
Ответ:
THE VALUE OF X IS 7 AND THE FORMULA OF THE HYDRATED SALT IS KAl(SO4)2.7H20
Explanation:
1. write out the varibales given in thequestion:
Mass of the hydrated salt = 4.74 g
Mass of water lost = 2.16 g
Formula of the hydrated salt = KAl(SO4)2. XH20
2. calculate the molar mass of the salt and that of water of crystallization:
Molar mass of anhydrous salt = ( K = 39, Al = 27, S = 32, 0=16)
= ( 39 + 27 + 32*2 + 16 * 8
= (39 + 27 + 64 + 128)
= 258 g/mol
Molar mass of water = 18 g/mol
3. Use this expression to calculate X:
The expression,
XH20 / molar mass of anhydrous salt = Mass of water lost / Mass of hydrated salt.
X = molar mass of anhydrous salt * mass of water lost / mass of anhydrous salt * H20
where XH20 is the molar mass of water of crystallization, is used to calculate the value of X.
4. Solve for X:
So therefore:
X = 258 * 2.16 / 4.74 * 18
X = 557.28/ 85.32
X = 6.53
X is approximately 7.
The value of X is 7 and the formula pf the hydrated salt is KAl(SO4)2.7H20
Ответ:
116.88 g
Explanation:
Step 1: Write the balanced equation for the synthesis of NaCl
Na + 1/2 Cl₂ ⇒ NaCl
Step 2: Calculate the moles corresponding to 45.978 g of Na
The molar mass of Na is 22.990 g/mol.
45.978 g × 1 mol/22.990 g = 1.9999 mol
Step 3: Calculate the number of moles of NaCl formed from 1.9999 moles of Na
The molar ratio of Na to NaCl is 1:1. The moles of NaCl formed are 1/1 × 1.9999 mol = 1.9999 mol.
Step 4: Calculate the mass corresponding to 1.9999 moles of NaCl
The molar mass of NaCl is 58.443 g/mol.
1.9999 mol × 58.443 g/mol = 116.88 g