Answers
Answer:The answer is B my child
Explanation:
Related Questions
A black bear can run 35.0 mph how long will it take to run 1.95 x 10^4?
A. 129
B. 0.360
C. None of the above
D. 0.106
E. 13
Answers
Answer:
The correct answer is C. None of the above.
Explanation:
To determine how long the black bear will run, the distance it will travel must first be determined. Thus, the proposed calculation must be solved.
1.95 x 10 ^ 4
1.95 x 10 x 10 x 10 x 10
19.5 x 10 x 10 x 10
195 x 10 x 10
1950 x 10
19500
Thus, the bear will run 19,500 miles, so, running at 35 mph, it will take about 557 hours to run that distance (19,500 / 35).
what is write out the following number as a decimal number
[tex]1.2 \times {10}^{5} [/tex]
Answers
Answer:
120000Explanation:
I hope this helps
The sulfuric acid–catalyzed reaction of isopentyl alcohol with acetic acid to form isopentyl acetate is performed. This reaction does not proceed to completion. After the reaction is heated under reflux for an hour, the product mixture is washed with aqueous sodium bicarbonate solution, and the organic layer is thoroughly dried. A distillation of the organic layer is then performed. Given the boiling points listed below, select the compound that will distill first.
Compound Boiling point, ℃
acetic acid 118
isopentyl acetate 142
isopentyl alcohol 130
sulfuric acid water 290
Answers
Answer:
The correct option is acetic acid
Explanation:
Distillation is the process of separating a mixture of substances based on differences in boiling points. During distillation, the compound with the lowest/least boiling point is distilled and collected first and then the one with the next least boiling point and it goes on like that.
From the explanation above, acetic acid has the least boiling point (in the organic layer) with 118°C and thus will distill first. This is then followed by isopentyl alcohol (130°C) and then isopentyl acetate (142°C) and finally sulfuric acid water (290°C).
Which pair of elements are most likely to form a molecular compound?
Nitrogen and Hydrogen
Calcium and Copper
Chlorine and Neon
Please help! I will mark brainliest if correct!
Answers
Answer: Two nonmetals.
Explanation:
Answer:The only pair of nonmetals is sulfur and fluorine.
Explanation:The pair of elements most likely to form a molecular compound with each other are two nonmetals.
Which is the larger atom kr Or As
Answers
Answer:
I think As is larger
Explanation:
I really need help on this
..
Answers
Answer:
b
Explanation:
Isotopes have
Question 1 options:
A)
different numbers of both protons and neutrons in their nuclei.
B)
a different number of neutrons in their nuclei.
C)
a different number of protons in their nuclei.
D)
a different number of electrons.
Question 2 (5 points)
An aqueous solution
Question 2 options:
A)
must contain three or more substances.
B)
is a single-phase heterogeneous mixture.
C)
has water as the solvent.
D)
has water as the solute.
Question 3 (5 points)
Which of the following is a homonuclear diatomic molecule?
Question 3 options:
A)
NH3
B)
CO
C)
2CO2
D)
H2
Question 4 (5 points)
Given a container of a solution of 5% HCl, all samples tested from this same bottle will have the same mass ratio of hydrogen to chlorine. This is an application of
Question 4 options:
A)
the law of conservation of energy.
B)
the law of multiple proportions.
C)
the law of conservation of mass.
D)
the law of constant composition.
Question 5 (5 points)
Elements in the same period
Question 5 options:
A)
have the same principal quantum number.
B)
form bonds with the same type of elements.
C)
have the same number of valence electrons.
D)
have the same number of protons.
Answers
Answer:
question 1 answer is b
Explanation:
istopes equal to same atomic number but different mass number
The mass of an object is 13.76 g. the volume of the object is 2.83 ml. what is the density of the object to the correct number of significant figures?
Answers
Answer:
D ≈ 4.86 g/mL
Explanation:
Density = Mass over Volume
D = m/V
Step 1: Define variables
m = 13.76 g
V = 2.83 mL
D = unknown
Step 2: Substitute and Evaluate for Density
D = 13.76 g/2.83 mL
D = 4.8621908127208480565371024734982 g/mL
Step 3: Simplify
We are given 3 sig figs.
4.8621908127208480565371024734982 g/mL ≈ 4.86 g/mL
will mark brainliest, please hurry! :>
When a hydroxyl group is substituted for a hydrogen atom in a hydrocarbon, what type of molecule results?
a.
an alcohol
c.
a carboxylic acid
b.
an amine
d.
a polymer
Answers
Answer:
ans. will be a. an alcohol
Add 92.2 km to 9426 m and report the answer in km. 92.2 km + 9426 m = ____ km
Answers
Answer:
Sum of both value is 101.63 km
Explanation:
Given data:
1st value = 92.2 km
2nd value = 9426 m
Sum of both value in km = ?
Solution:
We know that there are 1000 m in 1 km. Thus,
92.2 km + 9426 m/1000 m × 1 km = 101.63 km
Thus, sum of both value is 101.63 km
Mass and energy are conserved
Question 16 options:
A)
only in chemical changes.
B)
in chemical changes and physical changes.
C)
always in physical changes and sometimes in chemical changes.
D)
only in physical changes.
Question 17 (5 points)
Which of the following can't be broken down any further chemically?
Question 17 options:
A)
Compounds
B)
Elements
C)
Matter
D)
Molecules
Question 18 (5 points)
A/an _______ is the smallest unit of matter that has the characteristics of a chemical element.
Question 18 options:
A)
atom
B)
proton
C)
molecule
D)
electron
Question 19 (5 points)
The distance between consecutive peaks or troughs in a wave is
Question 19 options:
A)
frequency.
B)
displacement.
C)
amplitude.
D)
wavelength.
Question 20 (5 points)
The phase transition of dry ice (frozen carbon dioxide) to gas is an example of
Question 20 options:
A)
condensation.
B)
sublimation.
C)
deposition.
D)
vaporization.
Answers
Explanation:
16 A. 17C matter 18C molecule 19D wavelength 20 C deposition
Isotopes have
Question 1 options:
A)
different numbers of both protons and neutrons in their nuclei.
B)
a different number of neutrons in their nuclei.
C)
a different number of protons in their nuclei.
D)
a different number of electrons.
Question 2 (5 points)
An aqueous solution
Question 2 options:
A)
must contain three or more substances.
B)
is a single-phase heterogeneous mixture.
C)
has water as the solvent.
D)
has water as the solute.
Question 3 (5 points)
Which of the following is a homonuclear diatomic molecule?
Question 3 options:
A)
NH3
B)
CO
C)
2CO2
D)
H2
Question 4 (5 points)
Given a container of a solution of 5% HCl, all samples tested from this same bottle will have the same mass ratio of hydrogen to chlorine. This is an application of
Question 4 options:
A)
the law of conservation of energy.
B)
the law of multiple proportions.
C)
the law of conservation of mass.
D)
the law of constant composition.
Question 5 (5 points)
Elements in the same period
Question 5 options:
A)
have the same principal quantum number.
B)
form bonds with the same type of elements.
C)
have the same number of valence electrons.
D)
have the same number of protons.
Question 6 (5 points)
Which of the following contribute(s) to most of the mass of an atom?
Question 6 options:
A)
Neutrons only
B)
Protons and neutrons
C)
Protons and electrons
D)
Protons only
Question 7 (5 points)
In a certain chemical reaction, the bonds of the products contain more energy than the bonds of the reactants. For the reaction to occur, which of the following best describes what occurred?
Question 7 options:
A)
Energy was released, so the reaction is endothermic.
B)
Energy was released, so the reaction is exothermic.
C)
Energy was added, so the reaction is endothermic.
D)
Energy was added, so the reaction is exothermic
Question 8 (5 points)
A solution
Question 8 options:
A)
is a single-phase homogeneous mixture.
B)
must contain water.
C)
is always a liquid.
D)
can contain more than two phases.
Question 9 (5 points)
Which of the following is true of alloys?
Question 9 options:
A)
They can only be composed of metals.
B)
They must be held together by chemical bonds.
C)
They're liquid solutions.
D)
They must contain a metal.
Question 10 (5 points)
Which of the following best describes an atomic number? An element's identity is defined by its atomic number; this means it represents the number of
Question 10 options:
A)
electrons in the element.
B)
neutrons in its nucleus.
C)
protons plus neutrons in its nucleus.
D)
protons in its nucleus.
Question 11 (5 points)
Electrons in the outermost shell of an atom that are available to bond with the electrons of other atoms are
Question 11 options:
A)
cations.
B)
free electrons.
C)
valence electrons.
D)
anions.
Question 12 (5 points)
Main group elements have valence electrons in which suborbitals?
Question 12 options:
A)
d and f
B)
s and p
C)
p and f
D)
s and d
Question 13 (5 points)
Molecules have
Question 13 options:
A)
only kinetic energy.
B)
only potential energy.
C)
both potential and kinetic energy.
D)
neither kinetic nor potential energy.
Question 14 (5 points)
The majority of elements are
Question 14 options:
A)
metalloids.
B)
nonmetals.
C)
metals.
D)
inert.
Question 15 (5 points)
A student found the mass of an object to be 26.5 g. To find the volume, the student submerged the object in a graduated cylinder of water. Submerging the object in the water in the graduated cylinder increased the water level by 24.1 mL. The density of the object is
Question 15 options:
A)
1.0906 g/mL.
B)
0.909 g/mL.
C)
1.10 g/mL.
D)
1.1 g/mL.
Question 16 (5 points)
Mass and energy are conserved
Question 16 options:
A)
only in chemical changes.
B)
in chemical changes and physical changes.
C)
always in physical changes and sometimes in chemical changes.
D)
only in physical changes.
Question 17 (5 points)
Which of the following can't be broken down any further chemically?
Question 17 options:
A)
Compounds
B)
Elements
C)
Matter
D)
Molecules
Question 18 (5 points)
A/an _______ is the smallest unit of matter that has the characteristics of a chemical element.
Question 18 options:
A)
atom
B)
proton
C)
molecule
D)
electron
Question 19 (5 points)
The distance between consecutive peaks or troughs in a wave is
Question 19 options:
A)
frequency.
B)
displacement.
C)
amplitude.
D)
wavelength.
Question 20 (5 points)
The phase transition of dry ice (frozen carbon dioxide) to gas is an example of
Question 20 options:
A)
condensation.
B)
sublimation.
C)
deposition.
D)
vaporization.
I WILL GIVE BRAINLIEST IF YOU CAN ANSWER THEM
Answers
Answer:
b
Explanation:
dueto isotopes haveno thesame neutral numbee hence b iscorrect
Answer:
b
Explanation:
Is crumbling sheet of paper physical or chemical change and why! Pls help fast!!!! :((
Answers
Answer:
Chemical
Explanation:
physical, because chemicl would be if it was disolving with water
Which statement best describes balancing equations and the law of conservation of mass?
O There are more atoms in the reactants than in the products, and the total mass is the same in the
reactants and in
the products
O The number of atoms is the same in the reactants and in the products, and the total mass is the same in the
reactants and in the products
O There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the
products
There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in
Toms
the products
Answers
Answer:
The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products.
The statement best describes balancing equations and the law of conservation of mass is the number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products. Therefore, option B is correct.
What is the law of conservation of mass ?According to the law of conservation of mass or principle of mass conservation, any system that is closed to all transfers of matter and energy must maintain a constant mass over time since the system's mass cannot vary and neither more nor less amount can be added or subtracted.
This law states that no matter what physical or chemical change occurs, the overall mass of the products and reactants remain identical.
Understanding and producing different chemical reactions depend heavily on this law. Researchers might anticipate how much the result would be if they knew the identities and quantities of the reactants for each reaction.
Thus, option B is correct.
To learn more about the law of conservation of mass, follow the link;
https://brainly.com/question/20635180
#SPJ6
How much heat, in kilojoules, must be added to a 580 g aluminum pan to raise its temperature from 25∘C to 150∘C?
---The specific heat capacity for aluminum is 0.897 J/g∘C.
---Round the answer to two significant figures.
Answers
Answer:
Q = 65 kJ
Explanation:
Given that,
Mass, m = 580 g
Initial temperature, [tex]T_i=25^{\circ} C[/tex]
Final temperature, [tex]T_f=150^{\circ} C[/tex]
The specific heat capacity for aluminum is 0.897 J/g°C
We need to find the heat added to the aluminium pan so that its heat raised to a temperature from 25°C to 150°C. It is given by :
[tex]Q=mc\Delta T\\\\Q=580\ g\times 0.897\ J/g^{\circ} C\times (150-25)^{\circ} C\\\\Q=65032.5\ J[/tex]
or
Q = 65.03 kJ
or
Q = 65 kJ
Hence, the heat added to the pan is 65 kJ.
Sodium chloride can be used to preserve meat because
Answers
Answer:
Salt is effective as a preservative because it reduces the water activity of foods. .
as a change of state takes place, heat and temperature
a. increase stays the same
b. stays the same, stays the same
c.stays the same, changes.
d.increases,increases
Answers
Answer:
c. stays the same, changes
Explanation:
temperature and heat go hand in hand, however while the change of state occurs, the temperature remains the same while the heat increases since the heat input is constant.
As a change of state takes place, heat and temperature: C. stays the same, changes.
Matter can be defined as anything that has mass and occupies space. Thus, any physical object or substance that is found on earth is typically composed of matter.
Since all matter are made up of atoms, they have a property of existing in three (3) distinct states and these include;
Solid.Gas.Liquid.Generally, matter changes state when heat (thermal energy) is released or absorbed with a corresponding change in its temperature.
In conclusion, at the point when the change of state is taking place, heat stays the same and temperature changes.
Find more information: https://brainly.com/question/17203857
At what time was the frog sitting still or at rest
Answers
Answer:
frogs don't spend all their time swimming, nor do they spend all ... The frog is capable of sitting perfectly still for hours on end, only to suddenly ... When a frog is resting or hunting, he will sit on whatever is handy.
Explanation:
Hope I helped if I did please mark me brainiest Thanks! <333 :3
What step will be most effective for a manufacturer that wants to reduce the human costs of extracting the minerals it uses in its smartphones?(1 point)
committing to only mining minerals in the United States
decreasing the prices of its products
switching to using gold instead of tungsten in its products
verifying that child labor was not used in mining these minerals
Please Help ASAP
Answers
Which of the following is true for polar jet streams?
They bring cool air.
They bring warm air.
They blow at the equator.
They blow from north to south.
Answers
Answer:
A: They bring cool air.
Explanation:
Took the test and got it correct. :)
Jet streams are fast flowing meandering air currents. Polar jet streams bring cool air through the atmosphere. Polar jets meet subtropical jets at some regions.
What are polar jet streams ?The polar jet stream, which travels through the lower layers of the atmosphere in the Northern Hemisphere, is a swiftly moving band of westerly winds.
The confluence of warm air ascending from the tropics and cold air masses descending from the arctic produces the jet. The denser cold air lowers and deflects the warmer air areas north, creating deep troughs and steep ridges that give the jet stream its wavy appearance.
As pockets of cold air intermittently sneak down from the Arctic, this pattern spreads across the mid-latitudes of North America, Europe, and Asia, producing opposing waves and flows that speed eastward due to the earth's rotation.
Find more on jet streams:
https://brainly.com/question/885071
#SPJ2
I NEED AN ANSWER PLEASE!
A element is having atomic number 82. find the number of its protons and electrons
Answers
Answer:
the element is lead
Explanation:
the atomic number of lead is 82.
number of protons 82
number of electrons 82
What is the correct order of star colors from hottest to coolest?
white, yellow, red, blue
yellow, orange, white, red
red, orange, yellow, blue-white
blue, white, yellow-white, orange
Answers
Answer: The answer is blue, white, yellow-white, orange.
Explanation: These are the two basic reasons for different star colors:
Temperature – cooler stars are red, warmer ones are orange through yellow and white. The hottest stars shine with blue light
Age – As a star ages it produces different chemicals which burn at different temperatures. We can use a star’s color to show its relative age
Answer:
OR D
Explanation:
D on edge 2020
Which of the following molecules has a trigonal pyramidal shape?
CO
Ni ---CO
A.
СО
OBCI-S c
Xeo
O.
O C.
0-N
Answers
Answer:
Xeo
Explanation:
A is the molecules with the trigonal pyramid shape
What is the molecular geometry of the atoms bonded to the carbon atom indicated with arrow I in this structure of caffeine?
Answers
Answer:
Trigonal planar
Explanation:
If we look at the carbon atom indicated I in the image, we will discover that it is a carbon atom that is bonded to a nitrogen atom via a double bond.
Recall that an sp2 hybridized carbon atom has a trigonal planar geometry. When a carbon atom is sp2 hybridized, it is in a trigonal planar geometry as we can clearly see from the image.
Instructions
Click the links to open the resources below. These resources will help you complete the assignment. Once you have created your
file(s) and are ready to upload your assignment, click the Add Files button below and select each file from your desktop or network
folder. Upload each file separately.
Answers
1. This experiment was to find how mass and speed effect KE. This is important because if you were in a situation where you needed something to go higher, you would know to add more or less of mass/speed.
To test mass, we filled the bean bag with a certain amount of water, then dropped it. After, you recorded how high it made the bean bag go. The same with speed, but same amount in the bottle, just dropped from different heights.
My hypothesis is when you have more mass, the KE will be greater. This is also the same with speed, if it is dropped from a higher place, the bean bag will launch farther than the last time.
2. Data I collected from the lab was like my hypothesis explained. When the height of the bottle increased, it made the bean bag go higher than the last. And I tested 4 different masses, 0.125 kg, 0.250kg, 0.375kg and 0.500kg. Each time the bean bag went higher on a larger mass.
A lot of times on the speed test, the bean bag would go higher than the bottle drop point, but not every time. Also, when it was dropped from the same height each time, some results varied quite a bit, like when it was dropped from 1.28 the results were 1.14 then 1.30 1.30. Mass on the other hand was all in the same number range, only once the numbers were a bit off from each other.
3. Some formulas I used were KE= ½ mv^2 and Ht v^2/2g. The first was to calculate the kinetic energy of an object, m=mass v=speed. Second was for finding out what height I needed to drop something to reach a certain speed, Ht=Height and g= Gravitational Acceleration of 9.8 m/s^2.
I used these to figure out tables that showed relationships between different things like mass and KE or speed and height. The whole time I was doing the lab, my data was going up, when there was more mass/speed there were higher values in the table.
This means that my hypothesis at the beginning was correct, more of m/s means KE will increase proportionally because they are all linear. I found it surprising when the bean bag height went over the water bottle drop mark.
4. To conclude, my hypothesis matched my data. The data values went up when more mass or speed was added. This means if I were in a situation where I needed more kinetic energy for something, I would know to increase mass or the speed of the object giving it energy.
The reason that this hypothesis is correct is when you have more mass, you have more energy. So, when you drop let's say a baseball, it isn’t that heavy so it would only launch the bean bag so far. But a bowling ball is very heavy and has lots of energy when falling because of that, it would make the bean bag go very high.
To make this experiment better, I would use a smoother material for the lever so energy wouldn’t be lost by friction from wood rubbing together. Also, maybe a scanner or video camera to more accurately record how far the bean bag went. All of these would help the lab get more precise results, maybe they could be used in a future lab.
Explanation:
Answer:
ima give my whole doc if anyone need it in future like i did Edge 2023
Explanation:
10. What is the change in the boiling point of water at 1000 C per Pa change under atmospheric pressure conditions? The molar enthalpy of vaporization is 40.69 kJ mol-1, the molar volume of liquid water is 0.019 x 10-3 m3 mol-1, and the molar volume of steam is 30.199 x 10-3m3 mol-1, all at 1000 C and 1.01325 bar. (Hint: change in temperature per change in pressure)
Answers
Answer:
The answer is [tex]\frac{dT}{dP} = 2.84*10^{-4}\ K/Pa[/tex]
Explanation:
From the question we are told that
The boiling point of water is [tex]T_b = 100^oC = 100 + 273 = 373 \ K[/tex]
The enthalpy of vaporization is [tex]\Delta H_{vap} = 40.69 \ kJ mol-1 = 40.69 *10^{3} \ J/mol[/tex]
The molar volume of liquid water is [tex]V =0.019 * 10^{-3} m^3 mol^{-1}[/tex]
The molar volume of steam is [tex]V_s = 30.199 * 10^{-3} \cddot m^3\cdot mol^{-1}[/tex]
The pressure is [tex]P = 1.01325 \ bar[/tex]
Gnerally from Clausius Clapeyron equation we have that
[tex]\frac{dP}{dT} = \frac{\Delta H_{vap}}{ T * \Delta V}[/tex]
Here [tex]\Delta V = V_s - V[/tex]
=> [tex]\Delta V = [30.199 * 10^{-3} ] - [ 0.019 * 10^{-3}][/tex]
=> [tex]\Delta V = [30.199 * 10^{-3} ] - [ 0.019 * 10^{-3}][/tex]
=> [tex]\Delta V = 0.03018 \ m^3 mol^{-1}[/tex]
So
[tex]\frac{dP}{dT} = \frac{40.69 *10^{3} }{ 373 * 0.03018}[/tex]
=> [tex]\frac{dP}{dT} = 3522.28 \ Pa/K[/tex]
Generally from the we are ask to obtain the change in the boiling point of water at 1000 C per Pa change under atmospheric pressure conditions which is mathematically represented as
[tex]\frac{d T}{dP}[/tex]
So
[tex]\frac{dT}{dP} = \frac{1}{\frac{dP}{dT} } = \frac{1}{3522.28}[/tex]
=> [tex]\frac{dT}{dP} = \frac{1}{\frac{dP}{dT} } = 2.84*10^{-4}\ K/Pa[/tex]
The strength of an acid is affected by the polarity of the bond connected to the acidic hydrogen. The more highly polarized this bond, the more easily the hydrogen is ionized. Electronegative atoms or groups of atoms present in the structure of an acid can act to withdraw electrons and produce additional polarization. Two common groups of acids to which this principle can be applied are oxyacids and carboxylic acids. Arrange the following oxyacids in order of decreasing acid strength. Rank from strongest to weakest acid.
a. HBrO
b. HClO
c. HClO3
d. HClO2
Answers
Answer:
Explanation:
Oxyacids are acid containing oxygen; they are also known as acid-alcohol or acid-phenol. As said earlier, the strength of these acids increases with increases in the polarity of these compounds. So, what makes the polarity is as a result of the electronegative substituents attached to it. Halogen family possesses the highest electronegativity in the periodic table, and electronegativity decreases down the group.
The ranking of the oxyacids in order of decreasing acid strength from strongest to weakest acid is:
HClO3 > . HClO2 > HClO > HBrO
Lollll I need help with this question
Answers
Answer:
Waves are any vibration that transfers energy from place to place.
Explanation:
IM NOT SURE ABOUT THE VIBRATION BIT BUT I AM ABOUT THE ENERGY
The reaction below shows how the potential energy changes during a
chemical reaction. What does the red arrow show?
Answers
Answer:
Option C. Change in enthalphy is negative, the reaction is exothermic.
Explanation:
In the profile diagram given in the question above, we can see clearly that the energy of the reactant (Hr) is higher than the energy of product (Hp).
Hence, the enthalpy change (ΔH) will be negative i.e
Enthalpy change (ΔH) = Energy of product (Hp) – Energy of reactant (Hr)
ΔH = Hp – Hr = negative (–) [since Hr is higher than Hp]
A reaction in which the enthalpy change (ΔH) is negative is termed exothermic reaction.
within a balloon there are 3 types of gases. the first gas, A, is 6.0 grams in amount, the second gas, B, is 4.0 grams and the last, C, is 3.5 grams. The molar mass of gas "A" is 13.56 g/mol, "B" is 11.76 g/mol and "C" is 12.07 g/mol. If the total pressure inside the balloon is 15 atm, what is the partial pressure of each gas?
Answers
Answer:
Partial pressure of Gas A = 3.91 atm
Partial pressure of Gas B = 5.10 atm
Partial pressure of Gas C = 5.99 atm
Explanation:
Number of moles of gas A;
n_A = 13.56 g/mol ÷ 6 g = 2.25 moles
Number of moles of gas B;
n_B = 11.76 g/mol ÷ 4 g
n_B = 2.94 moles
Number of moles of gas C;
n_C = 12.07 g/mole ÷ 3.5 moles
n_C = 3.45 moles
Total number of moles = n_A + n_B + n_C = 2.25 + 2.94 + 3.45 = 8.64 moles
Mole fraction of gas A; X_a = 2.25/8.64
Mole fraction of gas B;X_b = 2.94/8.64
Mole fraction of gas C;X_c = 3.45/8.64
Now, partial pressure of each gas will be;
Mole fraction × Total pressure
We are given total pressure of 15 atm.
Thus;
P_a = (2.25/8.64) × 15
P_a = 3.91 atm
P_b = (2.94/8.64) × 15
P_b = 5.10 atm
P_c = (3.45/8.64) × 15
P_c = 5.99 atm
Thus;
Partial pressure of Gas A = 3.91 atm
Partial pressure of Gas B = 5.10 atm
Partial pressure of Gas C = 5.99 atm