menu
bartleby
search
close search
Hit Return to see all results

A 50.0 mg sample of FeCl3·xH2O was heated to drive off the waters of hydration. After cooling to room temperature, the resulting residue weighed 30.0 mg. Determine the chemical formula of the hydrate, and name the hydrate.

Question

A 50.0 mg sample of FeCl3·xH2O was heated to drive off the waters of hydration. After cooling to room temperature, the resulting residue weighed 30.0 mg. Determine the chemical formula of the hydrate, and name the hydrate. 

check_circleAnswer
Step 1

Given,

Mass of sample of FeCl3.xH2O = 50.0 g

After driving off water from sample, mass of FeCl3 = 30.0 g

Moles of FeCl3 can be calculated as:

Molar mass of FeCl3
55.8 (3x35.5) = 162.3 g/mol
Mass
30.0 g
Moles
0.185 mol
Molar mass
162.3 g/mol
help_outline

Image Transcriptionclose

Molar mass of FeCl3 55.8 (3x35.5) = 162.3 g/mol Mass 30.0 g Moles 0.185 mol Molar mass 162.3 g/mol

fullscreen
Step 2

It is clear that, 1 mole of FeCl3.xH2O contains 1 mole of FeCl3.

So, moles of FeCl3.xH2O = moles of FeCl3 = 0.185 mol

Therefore...

Molar mass of FeCl3.XH2O = 55.8 + (3x35.5) x (2x1+16)
- (162.3 18 x) g/mol
Mass
Moles
Molar mass
50.0 g
0.185 mol
(162.3+18 x) g/mol
50.0
(162.3 18 x)=
= 270.27
0.185
18 x 270.27 - 162.3
x= 5.99 6
help_outline

Image Transcriptionclose

Molar mass of FeCl3.XH2O = 55.8 + (3x35.5) x (2x1+16) - (162.3 18 x) g/mol Mass Moles Molar mass 50.0 g 0.185 mol (162.3+18 x) g/mol 50.0 (162.3 18 x)= = 270.27 0.185 18 x 270.27 - 162.3 x= 5.99 6

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Our solutions are written by experts, many with advanced degrees, and available 24/7

See Solution
Tagged in

Science

Chemistry

General Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: rank the indicated protons in decreasing order of acidity

A: The formation of the negative charge (carbanion), and it is stabilised by the resonance system and t...

question_answer

Q: Convert CuCl2.6(H2O)2 to whole numbers

A: Given,CuCl2.6*(H2O)2Find and multiply the decimal number in the molecular formula with a least numbe...

question_answer

Q: Explain the bicarbonate buffer system

A: Buffer solution is defined as a solution which resist the change in pH of the solution on the additi...

question_answer

Q: Which method should lead to greater precision? Which method actually is more precise? Explain

A: Method 1 relative average deviation is calculated as,

question_answer

Q: The atomic weight of Ga is 69.72 amu. There are 69.0 amu, and Ga, with a weight of 71.0 amu. The nat...

A: Let the percentage of the isotope 69Ga be =x%Then,The percentage of the isotope 71Ga is =(100−x)%

question_answer

Q: Given that a reaction is a first order process, determine the time in minutes for 3.83643 M of a mat...

A: Given, The initial amount of the reactant is 3.83643 M.Remaining amount is 0.03796 M.Rate constant i...

question_answer

Q: Silver chloride, often used in silver plating, contains 75.27% Ag. Calculate the mass of silver chlo...

A: The given mass of pure silver is converted into grams.

question_answer

Q: Can I have this section explained to me? Why is the second image incorrect?

A: The naming of organic molecules happens with the help of IUPAC nomenclature which consists of certai...

question_answer

Q: 4. Another peptide fragment that is 33 residues long is recognized as the most resistant to being di...

A: In the given sequence of peptide, L, Q, P, F, and Y are five different amino acids.

Sorry about that. What wasn’t helpful?