1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
alexdok [17]
3 years ago
7

A solution is prepared by mixing 50.0 mL toluene (C6H5CH3 d=0.867 g/mL) with 125 mL Benzene (C6H6 d=0.874 g/mL). Assuming that t

he volumes add upon mixing, calculate the mass percent, mole fraction, molality, and molarity of the toluene.
Chemistry
1 answer:
Tatiana [17]3 years ago
4 0

Answer:

mass % = 28.4%

mole fraction = 0.252

molality = 3.08 molal

molarity = 2.69 M

Explanation:

Step 1: Data given

Volume of toluene = 50.0 mL = 0.05 L

Density toluene = 0.867 g/mL

Molar mass toluene = 92.14 g/mol

Volume of benzene = 125 mL = 0.125 L

Density benzene = 0.874 g/mL

Molar mass benzene = 78.11 g/mol

Step 2: Calculate masses

Mass = density * volume

Mass toluene = 50.0 mL * 0.867 g/mL = 43.35 g

Mass benzene = 125 mL * 0.874 g/mL = 109.25 g

Step 3: Calculate number of moles

Moles = mass / molar mass

Moles toluene = 43.35 grams /92.14 g/mol = 0.470 5 moles

Moles benzene = 109.25 grams / 78.11 g/mol = 1.399 moles

Step 4: Calculate molarity of toluene

Molarity = moles / volume

Molarity toluene = 0.4705 moles / 0.175 L = 2.69 M

Step 5: Calculate mass % of toluene

Mass % = (43.35 grams / (43.35 + 109.25) )*100 % = 28.4 %

Step 6: Calculate mole fraction of toluene

Mole fraction toluene = Moles toluene / total number of moles

Mole fraction toluene = 0.4705 / (0.4705 + 1.399) = 0.252

Step 7: Molality of toluene

Molality = number of moles / mass

Molality of toluene = 0.4705 moles / (0.04335 + 0.10925)

Molality of toluene = 3.08 molal

You might be interested in
What happened to the amplitude from wave A to wave B?
DanielleElmas [232]
A. <span>The amplitude doubled hope this helps and have a nice day</span>
5 0
3 years ago
Read 2 more answers
Is science logical please help meeeeeee
atroni [7]

Answer:

It kind of is logical so my answer is yes

6 0
3 years ago
Read 2 more answers
A 0.500-g sample of KCl is added to 50.0g of water in a calprimeter (Figure 5.12) If the temperature decreases by 1.05C. what is
Sauron [17]

Answer : The reaction is endothermic.

Explanation :

Formula used :

Q=m\times c\times \Delta T

where,

\Delta T = change in temperature = 1.05^oC

Q = heat involved in the dissolution of KCl = ?

m = mass = 0.500 + 50.0 = 50.5 g

c = specific heat of resulting solution = 4.18J/g^oC

Now put all the given value in the above formula, we get:

Q=50.5g\times 4.18J/g^oC\times 1.05^oC

Q=+221.64J

The heat involved in the dissolution of KCl is positive that means as the change in temperature decreases then the reaction is endothermic and as the change in temperature increases then the reaction is exothermic.

Hence, the reaction is endothermic.

8 0
3 years ago
Please help!
valkas [14]
The answer is B . Brønsted-Lowry Acid/bases trade H+
3 0
3 years ago
Massive amounts of energy are contained in an atom's: Select one:
melamori03 [73]
Nucleus.
____________
6 0
3 years ago
Other questions:
  • A fault in which the rocks on either side of the fault moves side of the fault move sideways past each other is a
    11·2 answers
  • In a step-down transformer, which side has more wire loops?
    15·2 answers
  • What word describes the splitting of a larger atom into smaller ones?
    11·2 answers
  • Use this equqation for the problem:4Al+3O2 --&gt; 2Al2O3 How many moles of oxygen are needed to completely react with 14.8 mol o
    11·1 answer
  • According to Le Châtelier's principle, a system at equilibrium will respond to a stress by shifting in the direction that reliev
    5·1 answer
  • When you find a new source of information, why is it important to think for yourself about whether to use that source?
    11·1 answer
  • Which statement accurately describes the chemical symbol of an element?
    11·2 answers
  • Significant Figures For 7.06 × 10^5 ÷ 5.3 × 10^-2
    15·1 answer
  • 100 pointts pls answer quick and no link :In the reaction, Hydrogen + Iodine --&gt; Hydrogen Iodide at equilibrium, some Iodine
    5·1 answer
  • If a scientist has 24 grams of CH4, what is the theoretical yield of CO2 that can be produced?
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!