7. The smallest representation of an lonic compound is

What is the molality of an aqueous solution containing FeCl3 (MM = 162.2 g/mol) with a mole fraction of FeCl3 of 0.15?

Natalka [10]

Answer:

10 m

Explanation:

The mole fraction of FeCl₃ of 0.15, that is, per mole of solution, there are 0.15 moles of FeCl₃ and 1 - 0.15 = 0.85 moles of water.

The molar mass of water is 18.02 g/mol. The mass corresponding to 0.85 moles is:

0.85 mol × 18.02 g/mol = 15 g = 0.015 kg

The molality of FeCl₃ is:

m = moles of solute / kilogram of solvent

m = 0.15 mol / 0.015 kg

m = 10 m

3 0

4 years ago

Which of the following is the correct chemical equation and is properly balanced for:

lbvjy [14]

Answer:are there any abc or do you have to make an answer?

Explanation:

4 0

3 years ago

Question 12 A chemistry student must write down in her lab notebook the concentration of a solution of sodium thiosulfate. The c

o-na [289]

Weight of sodium thiosulfate = 76.148 - 8.2

= 67.948 g.

Concentration of the solution = 67.948 / 172.7

= 0.393 g / mL. to the nearest thousandth . (answer).

3 0

4 years ago

An industrial-strength pipe cleaner has a molarity (M) ) of 7.0 a 0.60 liter container. To be safely used on the pipes in a home

Vsevolod [243]

Answer:

1.68L

Explanation:

Step 1:

Data obtained from the question. This includes the following:

Initial Molarity (Mi) = 7M

Initial volume (Vi) 0.6L

Final Molarity (Mf) = 2.5M

Final Volume (Vf) =.?

Step 2:

Determination of the final volume of the solution.

This can be achieved as shown below:

MiVi = MfVf

Divide both side by Mf

Vf = MiVi /Mf

Vf = 7 x 0.6 / 2.5

Vf = 1.68L

Therefore, the new volume of the solution is 1.68L

6 0

3 years ago

Which compound is likely to have an incomplete octet? which compound is likely to have an incomplete octet? so3 h2s ph3 no?

borishaifa [10]

Answer:- Octet of NO is incomplete.

Explanations:- For sulfur trioxide, there are total 24 valence electrons. S is the central atom. Two O atoms are bonded to S via single bonds and the third O is bonded to S via double bond. So, in this way, the octet of each O is complete. Total 8 electrons are used in bonding. Each of the single bonded O has three lone pairs and the double bonded O has two lone pairs. It means total 16 electrons are present in the form of lone pairs. The sum of electrons used in bonding and present as lone pairs is 16+8 = 24 and this is exactly same as total valence electrons. So, the octet of S is also complete.

hydrogen sulfide has total 8 valence electrons. H has only one valence electron and can form only a single bond. So, two H atoms are bonded to S via single bonds. Total 4 electrons are used in bonding and remaining 4 electrons are present as two lone pairs on S. So, the octet of S is also complete.

Phosphane has total 8 valence electrons. P is the central atom and the three H atoms are bonded to it via single bonds. Total 6 electrons are used in bonding and rest of the two electrons are present as one lone pair on P. The octet of P is also complete.

NO has 11 valence electrons. Either we make a single, double or triple bond between N and O, the octet for at least one of them is incomplete as there are add number of electrons. The best lewis structure of NO has a triple bond between N and O, 4 electrons around it and N has 3 electrons around it. The octet of O is complete but the octet of N is incomplete as it could complete only 7 electrons.

So, the right answer is NO.

Lewis structures for all the four molecules are given below:

7 0

4 years ago