An ideal solution of liquids a and b has xa = 0.25 and ya = 0.50 at t = 400 k. The ratio pa*/pb* is 0.67.
To calculate the ratio of pa*/pb*, we need to use the Raoult's law equation, which states that the partial vapor pressure of a component in an ideal solution is equal to the product of the vapor pressure of the pure component and its mole fraction in the solution. Mathematically, it can be expressed as:
pa* = Paoa * xa
pb* = Pbob * xb
where pa* and pb* are the partial vapor pressures of components A and B in the ideal solution, Paoa and Pbob are the vapor pressures of pure components A and B, and xa and xb are their respective mole fractions in the solution.
Given that xa = 0.25 and ya = 0.50 at t = 400 K, we can calculate the mole fraction of component B as:
xb = 1 - xa = 1 - 0.25 = 0.75
Now, let's assume that the vapor pressure of pure component A (Paoa) is 100 kPa and that of pure component B (Pbob) is 50 kPa at 400 K. Using Raoult's law equation, we can calculate the partial vapor pressures of components A and B in the ideal solution as:
pa* = Paoa * xa = 100 kPa * 0.25 = 25 kPa
pb* = Pbob * xb = 50 kPa * 0.75 = 37.5 kPa
Therefore, the ratio of pa*/pb* can be calculated as:
pa*/pb* = 25 kPa / 37.5 kPa = 0.67
So, the ratio of pa*/pb* is 0.67.
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An ideal solution of liquids a and b has xa = 0.25 and ya = 0.50 at t = 400 k.
The ratio pa*/pb* is 0.67.
How do we calculate?We will apply Raoult's law equation, which states that the partial vapor pressure of a component in an ideal solution is equal to the product of the vapor pressure of the pure component and its mole fraction in the solution.
It can written as
pa* = Paoa * xa
pb* = Pbob * xb
xa = 0.25
ya = 0.50
temperature = 400 K
xb = 1 - xa = 1 - 0.25 = 0.75
pa* = Paoa * xa = 100 kPa * 0.25 = 25 kPa
pb* = Pbob * xb = 50 kPa * 0.75 = 37.5 kPa
We now find the ratio of pa*/pb* :
pa*/pb* = 25 kPa / 37.5 kPa
pa*/pb* = 0.67
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A 15.0 g piece of graphite is heated to 100.0°C and placed in a calorimeter. The
graphite releases 815.1 J of heat to reach a final temperature of 23.9°C. What is
the specific heat of graphite?
Answer:
0.714Jg^-10C^-1.
Explanation:
According to specific heat capacity, the specific heat of graphite is -0.714 J/g°C.
What is specific heat capacity?Specific heat capacity is defined as the amount of energy required to raise the temperature of one gram of substance by one degree Celsius. It has units of calories or joules per gram per degree Celsius.
It varies with temperature and is different for each state of matter. Water in the liquid form has the highest specific heat capacity among all common substances .Specific heat capacity of a substance is infinite as it undergoes phase transition ,it is highest for gases and can rise if the gas is allowed to expand.
It is given by the formula ,
Q=mcΔT
In the given example, it is calculated as, c=Q/mΔT
Substituting values in above equation, c= 815.1/15×(-76.1)
c=-0.714 J/g°C
Thus, the specific heat of graphite is -0.714 J/g°C.
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Q1.
How many peaks are there in the 13C NMR spectrum of 1,4-dimethylbenzene?
A: 8
B: 4
C: 3
D: 2
Answer:
there are four peaks in the 13c NMR (B)
To solve this we must be knowing each and every concept related to NMR. Therefore, the correct option is option B among all the given options.
What is NMR?NMR spectroscopy is a form of spectroscopy that may be used to evaluate the quality or purity of such a sample as well as the molecular weight of a substance.
It really is based on the observation that now the nuclei among most atoms have spin and that all nucleus are electrically charged. NMR spectroscopy relies on the electromagnetic radiation absorption in the radiofrequency range 3kHz-300 GHz. There are four peaks in the 13C NMR spectrum of 1,4-dimethylbenzene.
It occurs at such a wavelength that corresponds to radio frequencies, and when an electron recovers from such an excited state back ground state, it produces the same frequency radio wave.
Therefore, the correct option is option B.
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In eukaryotic cells, RNA is transcribed from DNA in the _____
ribosomes
nuclear membrane
cytosol
nucleus
Answer:
The answer is Nucleolus
is there a better way to figure out the ratio of molecule types? What might that be?
An iron nail that has rusted is an example of a chemical reaction.
True
False
Answer:
True
Explanation:
2NaCl → 2Na +Cl2
What reaction is this
Answer:
Decomposition reaction
Explanation:
A single reactant breaking down to form 2 or more products is decomposition
84.9 g of solid iron reacts with oxygen gas forming iron(III) oxide. How many moles of oxygen will react
Answer:
1.14 moles of oxygen will react
Explanation:
The balanced equation of reaction between iron and oxygen is
4 Fe + 3 O₂ → 2 Fe₂O₃
By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of each compound participate in the reaction:
Fe: 4 molesO₂: 3 molesFe₂O₃: 2 molesThe molar mass of iron being Fe 55.85 g/mole, then the following amount of mass reacts by stoichiometry: 4 moles* 55.85 g/mole=223.4 g
You can apply the following rule of three: if by stoichiometry 223.4 grams of Fe react with 3 moles of O₂, 84.9 grams of Fe react with how many moles of O₂?
[tex]moles of O_{2} =\frac{84.9 grams of Fe*3 moles ofO_{2} }{223.4 grams of Fe}[/tex]
moles of O₂= 1.14 moles
1.14 moles of oxygen will react
HELP I HAVE 14 MINUTES!!
Which of the following combinations go together to create true statement about subatomic particles?
a - proton
b - neutron
c - electron
d - no charge
e - positive charge
f - negative charge
g - has mass
h - has no mass
Group of answer choices
1) b, d, and h
2) a, e, and h
3) b, d, and g
4) c, d, and h
Determine whether each change represents oxidation or reduction. 1) CH3CHO to CH3CH2OH 2) CH3OH to CH4 3) N2H4to N2 4) gain of electrons 5) NO-2 to NH3 6) NAD+ to NADH 7) CH4 to Co2 8) Ag+ to Ag
Answer:
1) oxidation
2) Reduction
3) Oxidation
4) Reduction
5) Reduction
6) Reduction
7) Oxidation
8) Reduction
Explanation:
Oxidation is said to have taken place when there is a positive change in the oxidation number while reduction is said to have taken place when there is a decrease in the oxidation number.
The change from CH3CHO to CH3CH2OH represents on oxidation reaction.
The change from CH3OH to CH4 is a reduction because the oxidation number of carbon changes from +2 to -4.
The change from N2H4to N2 is an oxidation because the oxidation number of nitrogen increases from -2 to 0.
The gain in electrons is a reduction because the gain of electron leads to a decrease in oxidation number.
The change from NO- 2 to NH3 is a reduction because the oxidation number of nitrogen changes from +4 to -3.
The change from NAD+ to NADH is a reduction since NAD+ is the oxidized form of the enzyme while NADH is the reduced form of the enzyme.
The change from CH4 to Co2 is an oxidation because the oxidation number of carbon changes from -4 to + 4.
The change from Ag+ to Ag is a reduction because it involves the gain of one electron and a consequent decrease in oxidation number.
How many atoms are in 1.22 moles of magnesium?
Answer:
7.34684 × 10^23 atoms
Explanation:
Well, one mole is basically
6.022 × 10^23 atoms. So 1.22 moles would be
6.022 × 10^23 ⋅ 1.22 atoms.
6.022 × 10^23 ⋅ 1.22 = 7.34684 × 10^23 atoms
The total number of atoms in 1.22 moles of magnesium is 7.34 × 10²³.
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions).The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.Given:
1.22 moles of magnesium
[tex]1 \text{ mole}= 6.022*10^{23}\text{ atoms}\\\\1.22 \text{ moles}= 1.22*6.022*10^{23}\text{ atoms}\\\\1.22 \text{ moles}=7.34*10^{23}\text{ atoms}[/tex]
So, the total number of atoms in 1.22 moles of magnesium is 7.34 × 10²³.
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Describe 1 physical property and 1 chemical properties of a metal bicycle
Answer:
A physical property would be The metal, while a possible chemical property would be a chance of gallium. (Gallium is liquid on hot days)
Explanation:
what is the meaning of resolution in science?
help me please
100% verified brainly answers to give me please.
Answer:
Resolution is the ability to distinguish two objects from each other. Light microscopy has limits to both its resolution and its magnification.
Do you think a chemical reaction occurs every time two substances are placed together in a reaction vessel?
Answer:
Not necessarily.
Explanation:
Two atoms of Nh3 reacts with one N2 how many moles of Nh3 reacts with one 2.00 mole of N2
Explanation:
there are four (4)mole of Nh3 that react with N2
In the equation for the orbital radii in hydrogen-like atoms, a0 is called the:
Select the correct answer below:
A. energy level
B. Bohr radius
C. nuclear charge
D. orbital constant
Calculate the number of molecules in 64.5 grams of Nitrogen monoxide, NO
N=9.933
Explanation:
no of mole = m÷mr
then ,no of molecules=n×la
How do you think the artist creates sculptures that vary in color and intensity?
Answer:
Light reflected off objects. Color has three main characteristics: hue (red, green, blue, etc.), value (how light or dark it is), and intensity (how bright or dull it is). Colors can be described as warm (red, yellow) or cool (blue, gray), depending on which end of the color spectrum they fall.
Christ Crowned / Honthorst
Christ Crowned with Thorns, Gerrit van Honthorst, about 1620
Value describes the brightness of color. Artists use color value to create different moods. Dark colors in a composition suggest a lack of light, as in a night or interior scene. Dark colors can often convey a sense of mystery or foreboding.
Light colors often describe a light source or light reflected within the composition. In this painting, the dark colors suggest a night or interior scene. The artist used light colors to describe the light created by the candle flame.
Annunciation / Bouts
The Annunciation, Dieric Bouts, 1450–1455
Intensity describes the purity or strength of a color. Bright colors are undiluted and are often associated with positive energy and heightened emotions. Dull colors have been diluted by mixing with other colors and create a sedate or serious mood. In this image the artist captured both the seriousness and the joy of the scene with the dull gray stone interior and the bright red drapery.
Explanation:
what is a method to isolate insoluble salts after a neutralisation reaction
Answer:
multiply
Explanation:
multiplacation
Most of the mass of an atom is found in
Answer:
Most of the mass of an atom is found in the nucleus.
Explanation:
Determine the number of moles in a 100.0g sample of water.
Answer:
5.55 moles is the answer ....
Explanation:
if 18g H2O is equal to 1 mole then 100 g H2O is how much?
100/18 which is 5.55
Answer:
5.551
Explanation:
100.0g x 1mol H20/18.015g H20 = 5.551 moles of H20
The 18.015g is from the periodic table. H = 1.008x2 = 2.016g H2
0= 15.999
15.999 + 2.016= 18.015
What is your observation of the relationship between m and a
Answer:
They are both letters?
Explanation:
Explain how you can convert from the number of representative particles of a substance to moles of that substance.
Answer:
the number of representative contain in 1 mol of a substance equals to 6.o2x10^23 particles.Number of representative particles of a substance can be converted to moles of that substance by multiplying it by Avogadro's number as 1 mole=6.023 ×10²³.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number
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Baking soda has a pH of 8. Its a(n) _________ substance
Acid
Neutral
Alkaline
Powdery
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Answer:
it's an acid
Explanation:
because itis soda
30)
Cosmologists believe that the universe is expanding and that it has been expanding since the Big Bang. Astronomers
viewing distant stars see evidence of this expansion in which phenomenon?
A)
Red shift
B)
Blue shift
Gamma pulse
D)
Background radiation
Answer:
i did this so the next person can have brainliest
Explanation:
What are the components of the land-based carbon cycle?
Answer:
Human exhale
Explanation:
When humans exhale-carbon is that which all humans produce=18% of all carbon output
Which of the following has a negative charge?
neutrons
electrons
nucleus
protons
Answer:
electrons have a negative charge
Explanation:
Answer:
Electrons
Explanation:
Choose the aqueous solution below with the highest boiling point. These are all solutions of nonvolatile solutes and you should assume ideal van't Hoff factors where applicable.
A) 0.075 m NaI
B) 0.075 m (NH4)3PO4
C) 0.075 m NaBrO4
D) 0.075 m LiCN
E) 0.075 m KNO2
Answer:
B. (NH₄)₃PO₄
Explanation:
Elevation of boiling point is one of the colligative properties.
Formula is: ΔT = Kb . m . i
ΔT = Boiling T° of solution - Boiling T° of pure solvent.
i = Van't Hoff factor (numbers of ions dissolved)
Kb = Ebulloscopic constant
In this case, all the m are the same so let's dissociate the salts:
NaI → Na⁺ + I⁻ i = 2
(NH₄)₃PO₄ → 3NH₄⁺ + PO₄⁻³ i = 4
NaBrO₄ → Na⁺ + BrO₄⁻ i = 2
LiCN → Li⁺ + CN⁻ i = 2
KNO2 → K⁺ + NO₂⁻ i = 2
The biggest i would have the biggest boiling point, then B is the right answer, ammonium phosphate.
You count the i, with the moles of ions, you dissociate from the salt.
How are the atomic number and the number of protons related to each other?
Answer:
Neutral atoms of each element contain an equal number of protons and electrons. The number of protons determines an element's atomic number and is used to distinguish one element from another. ... Together, the number of protons and the number of neutrons determine an element's mass number.
Explanation:
Table sugar and salt are examples of? A. mixtures B. elements C. atoms D. compounds
Answer:
The answer is compound because they consist of multiple things.
What are the 3 Newton laws
Answer:
The laws are: (1) Every object moves in a straight line unless acted upon by a force.
(2) The acceleration of an object is directly proportional to the net force exerted and inversely proportional to the object's mass.
(3) For every action, there is an equal and opposite reaction.
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