Write the chemical symbols for three different atoms or atomic cations with 24 electrons.

What is the vapor pressure (in kPa) of ethanol, CH3CH2OH, over a solution which is composed of 18.00 mL of ethanol and 12.55 g o

ladessa [460]

Answer:

The vapor pressure of ethanol in the solution is 10,27 kPa

Explanation:

To obtain the vapor pressure of a solution it is necessary to use Raoult's law:

$P_{solution} = X{solvent}P_{0solvent}$ (1)

The moles of ethanol are:

18,00mL× $\frac{0,789g}{1mL}$ × $\frac{1 mol}{46,07g}$ = 0,3083 mol Ethanol.

Moles of benzoic acid:

12,55 g× $\frac{1mol}{122,12g}$ = 0,1028 mol benzoic acid.

Thus, mole fraction of solvent, X, is:

$\frac{0,3083 mol}{0,3083mol+0,1028mol}$ = 0,7499

Replacing this value in (1):

$P_{solution} = 0,7499*13,693kPa$ = 10,27 kPa

I hope it helps!

7 0

3 years ago

tetraphosphorous hexaoxide is formed by the reaction of phosphorous (p4) with oxygen gas. if the reaction of 75.3 g of p4 with 3

True [87]

the Percentage yield for the reaction = 48.8%

What is Percentage yield ?

The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield. The percent yield is 100% if the theoretical and actual yields are equal. Because the real yield is frequently lower than the theoretical value, percent yield is typically lower than 100%. This may be due to incomplete or conflicting reactions or sample loss during recovery. If the percent yield is more than 100%, more sample than expected was retrieved from the reaction.

4 P + 3 O2 = P4O6

moles P = 75.3 g / 30.9738 g/mol= 2.43

moles O2 required = 2.43 x 3 / 4=1.82

actual moles O2 = 38.7 g /32 g/mol=1.21 so O2 is the limiting reactant

theoretical moles P4O6 = 1.21 / 3=0.403

theoretical mass P4O6 = 0.403 mol x 219.895 g/mol=88.6 g

% yield = 43.3 x 100/ 88.6 = 48.8 %

the Percentage yield for the reaction = 48.8%

To know about Percentage yield from the link

brainly.com/question/8638404

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4 0

1 year ago

What are 3 examples of pairs of atoms with polar covalent bonds?

mezya [45]

Answer:

Water - H2O

Ammonia - NH3

Sulfur dioxide - SO2

Hydrogen sulfide - H2S

Ethanol - C2H6O

Explanation:

Those are some atoms with polar covalent bonds. Hope this helps!!

8 0

4 years ago

For a solution of acetic acid (CH3COOH) to be called “vinegar,” it must contain 5.00% acetic acid by mass. If a vinegar is made

emmasim [6.3K]

Answer:

M = 0.838 M

Explanation:

1) Data:

a) Acetic acid CH₃COOH

b) molar mass of CH₃COOH: 60.052 g/mol

c) %: = 5.00%

d) d = 1.006 g/ml

e) M = ?

2) Formulae:

a) M = n of solute / V of solution in liters

b) n = mass in grams / molar mass

c) % = (mass of solute / mass of solution)×100

d) d = mass / volume

3) Solution:

a) Assume a basis

V = 1 liter of solution

b) Calculate the mass of that basis (1 liter of solution)

d = mass / V ⇒ mass = d × V

mass = 1.006 g/ml × 1 liter × 1,000 ml/liter = 1006 g

c) Calculate the mass of solute

% = (mass of solute / mass of solution ) × 100 ⇒

mass of solute = % × mass of solution / 100 = 5.00% × 1,006 g / 100

mass of solute = 50.3 g

d) Calculate the number of moles of solute

n = mass in grams / molar mass = 50.3 g / 60.052 g/mol = 0.838 mol

e) Calculate molarity

M = n / V in liter = 0.838 mol / 1 liter = 0.838 M ← answer

6 0

3 years ago

. If 69.15% exists as 63Cu with an atomic mass of 62.92, then what is the atomic mass of the second isotope?

Alexeev081 [22]

Answer: 64.8

Explanation:Please see attachment for explanation

8 0

3 years ago