How many atoms of aluminum are in a molecule of magnesium aluminum oxide (Al2MgO4)?
Answers
Answer:
12
Explanation:
Related Questions
Which of the following demonstrates a chemical change? (1 point)
• dry ice vaporizing
•
iron (Fe) reacting to water((H,O)) and
oxygen(O) to form iron oxide(Fe2Og)
O sugar and water mixing to create sugar water
• steam condensing on a mirror
Answers
The reaction that demonstrates a chemical change is iron (Fe) reacting to water((H,O)) and oxygen(O) to form iron oxide(Fe2Og). That is option B.
What is a chemical change?A chemical change is defined as the change that occurs when two substances reacts or combines to form an entirely new product.
The following are the features that shows that a chemical change has taken place. They include:
colour change, precipitate formation, gas formation, smell change, andchange in temperature.When the above signs are seems there is every reason to accept the fact that a chemical change has occurred in the chemical reaction that took place.
From the chosen option, the reactants and product of the chemical reaction are:
Iron (Fe) + water (H2O) --> iron oxide(Fe2Og)
This reaction is a chemical reaction as the product formed leads to a colour change known as rust.
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balance de CO2 + H2O
Answers
Explanation:
6 CO2 + 12 H2O ---->C6H12O6 + 6 O2+ 6 H2O
complete the description of crystalline lattices and lattice energy as they relate to ionic compounds. some terms will be used more that once, whereas some terms will not be used at all. Ionic ____________ in their solid state form _________ lattices of alternating metallic__________ and nonmetallic __________. The __________ of this lattice releases a large amount of energy, known as the ________ energy. Note that ___________ energy cannot be directly measured, but can only be approximated using ____________-___________ ____________ and its corresponding calculations.
Answers
Ionic compounds in their solid state form crystalline lattices of alternating metallic cations and nonmetallic anions. The formation of this lattice releases a large amount of energy, known as the lattice energy.
This energy is the energy that is released when two oppositely charged ions come together and form a crystal lattice. It is this energy that is responsible for the stability of the solid ionic compound.
Lattice energy cannot be directly measured, but can only be approximated using thermodynamic data and its corresponding calculations.
Thermodynamic data such as enthalpy of formation, and entropy of formation are used to calculate the lattice energy of a given ionic compound. This lattice energy is the energy that must be put into an ionic compound to break it down into its component ions and gaseous form.
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Bainliest. Mole Conversion
Using dimensional analysis determine how many moles are present in 125g of Oxygen gas. O = 16.0 g/mol (3 sig figs)
Answers
Answer:
125g × 1 mol/16 grams = 7.81 × avogadros #
* I NEED THIS *
Which of the following statements about oceans is incorrect?
A: Oceans collect water from other reservoirs including streams and rivers.
B: Oceans are the main source of drinking water on Earth's surface.
C: Oceans are connected to other reservoirs through evaporation and precipitation.
D: Oceans are the main type of reservoir that contain salt water.
Answers
Answer:
B is incorrect
Explanation:
Ocean are made of salt water which is undrinkable therefore they are not any type of drinking water source.
what is a positive ion? what is a negative ion? what is a positive ion? what is a negative ion? a positive ion is a neutral atom that has lost one or more protons. a negative ion is a neutral atom that has gained one or more protons. a positive ion is a neutral atom that has gained one or more electrons. a negative ion is a neutral atom that has lost one or more electrons. a positive ion is a neutral atom that has lost one or more neutrons. a negative ion is a neutral atom that has gained one or more neutrons. a positive ion is a neutral atom that has lost one or more electrons. a negative ion is a neutral atom that has gained one or more electrons.
Answers
A positive ion is a neutral atom that has lost one or more protons. A negative ion is a neutral atom that has gained one or more protons.
A positive ion is a neutral atom that has lost one or more electrons. In contrast, a negative ion is a neutral atom that has gained one or more electrons. In addition, when an atom loses or gains one or more electrons, it acquires a charge. A positive ion is created when an atom loses one or more electrons, resulting in a net positive charge. An atom that has one fewer electrons than protons will have a net positive charge. On the other hand, a negative ion is formed when an atom gains one or more electrons, resulting in a net negative charge. An atom that has one more electron than protons will have a net negative charge.
Electrically charged atoms are known as ions. Positively charged ions are known as cations, whereas negatively charged ions are known as anions. The charge of an ion is determined by the number of protons and electrons it has gained or lost.
A positive ion has also gained one or more electrons, while a negative ion has lost one or more electrons. Additionally, a positive ion has lost one or more neutrons, and a negative ion has gained one or more neutrons.
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Mark as Complete
Broken Bonds Quick Check
5 of 5
Use the reaction and bond information to answer the question.
dis a
ade of atoms that
electrons in two
when electrons are
e atoms then have
bond. A chemical
form. The breaking
reactions,
CH8 - CH + H2
Reactant bond energies: H-C = 413 kJ/mol, C-C single bond = 347 kJ/mol
Product bond energies: H-C 413 kJ/mol, C=C double bond = 614 kJ/mol, H-H-
432 kJ/mol
Based on the bond energies, is this reaction endothermic or exothermic? Why or why
not?
(1 point)
bonds of the
nergy is called the
nds are not all the
onds are easier to
ble and are harder to
ands,
This reaction is exothermic, because stronger bonds are broken than
formed
The reaction is exothermic, because stronger bonds are formed than
broken
The reaction is endothermic, because stronger bonds are formed than
broken
The reaction is endothermic, because stronger bonds are broken than
formed
Answers
Based on bond energies, the reaction is endothermic, because stronger bonds are broken than formed.
What is the total change in bond energy?The total change in bond energy of a reaction is calculated using the formula below:
Total change in bond energy = sum of energies of bonds broken - sum of energies of bonds formed.A reaction is exothermic if the total change in bond energy is negative meaning that stronger bonds are formed than broken.
A reaction is endothermic if the total change in bond energy is positive meaning that stronger bonds are broken than formed.
Given a reaction such as: C2H6 → C2H4 + H2
Sum of energies of bonds broken:
C-C + 6 × H-C
347 + 6 × 413
Sum of energy of bonds broken = 2825 kJ
Sum of energy of bonds formed:
C=C + 4 × H-C + H-H
614 + 4 × 413 + 432
Sum of energy of bonds formed = 2725 kJ
Total change in bond energy = 2825 - 2725
Total change in bond energy = 100 kJ
Since the value of total change in bond energy is positive, the reaction is endothermic.
Therefore, the reaction is endothermic, because stronger bonds are broken than formed.
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assuming no other unlisted ions are present in the water, use an anion-cation charge balance to estimate the concentration of sodium ion [na ]. give your answer in mg/l units.
Answers
Assuming no other unlisted ions are present in the water, the estimated concentration of \(Na^+\) (in mg/L as \(Na^+\)) is 21.2 mg/L.
Using an anion-cation balance, we may estimate the concentration of Na+ (in mg/L as Na+) by ensuring that the total positive charge from cations matches the total negative charge from anions.
The total positive charge from cations = (\(Ca^{+2} + M^g{+2} + Na^+ + K^+\))
The total negative charge from anions = (\(HCO^{3-} + SO_4^{2-} + Cl^-\))
Total positive charge = (40.0 + 10.0 + Na+ + 7.0)
Total negative charge = (67.2 + 11.0)
Total positive charge = Total negative charge
(40.0 + 10.0 + \(Na^+\) + 7.0) = (67.2 + 11.0)
Simplifying the equation:
57.0 + Na+ = 78.2
Subtracting 57.0 from both sides:
Na+ = 78.2 - 57.0
Na+ = 21.2 mg/L
Therefore, the estimated concentration of \(Na^+\) (in mg/L as \(Na^+\)) is 21.2 mg/L.
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Your question seems incomplete, the probable complete question is:
2. A sample of water has the following concentrations of ions (and pH = 7.0):
cations mg/L
anions mg/L
Ca+2
40.0
Mg+2
10.0
Na+
?
K+
7.0
HCO3 110.0
SO42-
67.2
Cl-
11.0
Assuming no other constituents are missing, use an anion-cation balance to estimate the concentration of Na* (in mg/L as Na*)? Remember that the balance cannot be in mg/L.
Is Used oil poured into a water drain in the street a non-point source solution or point source solution?
Answers
Answer:
Non point source pollution
Explanation:
Point source pollution is when any contaminant enter the environment from an easily from an easily identified and confined place.
Non point source pollution is pollutants released in a wide space. Including oil, grease, and toxic chemicals.
a typical volume leaving the large intestine might be 200 ml. if the volume exiting the large intestine were 408 ml, then it would most likely indicate a case of .
Answers
A volume of 408 ml exiting the large intestine would most likely indicate a case of diarrhea.
The large intestine, also known as the colon, is responsible for absorbing water and electrolytes from the digested material that enters it from the small intestine.
It helps in forming solid feces by removing excess water. A typical volume leaving the large intestine is around 200 ml, as mentioned.
If the volume exiting the large intestine significantly exceeds the typical volume, such as 408 ml, it indicates an increased amount of fluid reaching the colon or decreased absorption of water by the colon. This condition is commonly associated with diarrhea.
Diarrhea is characterized by the frequent passage of loose, watery stools. It can occur due to various factors, including infections, food intolerances, medication side effects, inflammatory bowel disease, and others.
Excessive fluid reaching the large intestine or impaired water absorption can lead to increased volume in the feces and result in the symptoms of diarrhea.
Therefore, a volume of 408 ml exiting the large intestine is suggestive of a case of diarrhea.
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is there a pattern to the location of planets based on their density ?
Answers
Yes!
Explanation:
If density is greater, the object sinks. Saturn is mainly composed of the lightest two gases known, hydrogen and helium. It is the only planet in our solar system whose density is less than water.
Please help me find the correct answer, thank you.
Answers
Answer:
The third line
Explanation:
The first one us wrong because they're not all found inside,electron is outside.
The second one is wrong as I explained previously.
Lastly the fourth line is wrong because protons are found in the nucleus.
How does a mixed inhibitor that has a higher affinity for the enzyme compared to the substrate affect the Michaelis-Menten constant (Km) in enzyme kinetics?
Answers
A mixed inhibitor that has a higher affinity for the enzyme compared to the substrate can affect the Michaelis-Menten constant (Km) in enzyme kinetics by increasing the value of Km.
Km is a measure of the substrate concentration required for half-maximal velocity and is a key parameter in describing enzyme catalysis. However, In the presence of a mixed inhibitor, the inhibitor molecule can bind to both the free enzyme and the enzyme-substrate complex with different affinities.
The binding of the inhibitor to the free enzyme reduces the number of active enzyme molecules available for catalysis while binding to the enzyme-substrate complex slows down the catalytic reaction. This leads to a reduction in the effective concentration of the enzyme-substrate complex, which in turn increases the apparent Km value.
In other words, the higher affinity of the mixed inhibitor for the enzyme reduces the efficiency of the enzyme-substrate complex formation, making it more difficult for the substrate to bind to the enzyme, hence increasing the value of Km. Therefore, a mixed inhibitor that has a higher affinity for the enzyme compared to the substrate can cause a decrease in the efficiency of enzyme catalysis, which is reflected in the increase in Km.
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WHAT DOES THE MASS OF AN OBJECT MEASURE HURRYYYYYYYYYYYYYYYYYYYYY
Answers
Answer:
object's inertial property
Explanation:
The mass of an object is a measure of the object's inertial property, or the amount of matter it contains. The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it. The pull of gravity on the earth gives an object a downward acceleration of about 9.8 m/s2.
Answer:
The mass of the object internal property, or the amount of matter it contains
Explanation:
Hope this helps! Happy Holidays!
Consider a buffer made by adding 53.5 g of (CH₃)₂NH₂I to 250.0 mL of 1.42 M (CH₃)₂NH (Kb = 5.4 x 10⁻⁴)
a. What is the pH of this buffer?
b . What is the pH of the buffer after 0.300 mol of H⁺ have been added?
c .What is the pH of the buffer after 0.120 mol of OH⁻ have been added?
Answers
a. The pH of the buffer solution is 10.71.
b. The pH of the buffer after adding 0.300 mol of H⁺ is 10.35.
c. The pH of the buffer after adding 0.120 mol of OH⁻ is 13.51.
a. Given:
Initial mass of (CH₃)₂NH₂I = 53.5 g
Molar mass of (CH₃)₂NH₂I = 144.21 g/mol
Volume of solution = 250.0 mL = 0.250 L
Initial molarity of (CH₃)₂NH = 1.42 M
Kb = 5.4 × 10⁻⁴
The moles of (CH₃)₂NH₂I:
Moles of (CH₃)₂NH₂I = mass / molar mass
Moles of (CH₃)₂NH₂I = 53.5 g / 144.21 g/mol
= 0.371 mol
Calculate the moles of (CH₃)₂NH:
moles of (CH₃)₂NH = initial molarity × volume
moles of (CH₃)₂NH = 1.42 M × 0.250 L
= 0.355 mol
To determine the moles of (CH₃)₂NH₂⁺, consider the reaction between (CH₃)₂NH and (CH₃)₂NH₂I, which is a salt of the weak base:
(CH₃)₂NH + HI ⇌ (CH₃)₂NH₂⁺ + I⁻
Since (CH₃)₂NH₂I is a salt, it dissociates completely in water, so the moles of (CH₃)₂NH₂⁺ is equal to the moles of (CH₃)₂NH₂I:
moles of (CH₃)₂NH₂⁺ = 0.371 mol
concentration of (CH₃)₂NH = moles of (CH₃)₂NH / volume
concentration of (CH₃)₂NH = 0.355 mol / 0.250 L = 1.42 M
concentration of (CH₃)₂NH₂⁺ = moles of (CH₃)₂NH₂⁺ / volume
concentration of (CH₃)₂NH₂⁺ = 0.371 mol / 0.250 L = 1.48 M
Use the expression for Kb to calculate the OH⁻ concentration:
Kb = [OH⁻][CH₃)₂NH₂⁺] / [CH₃)₂NH]
5.4 × 10⁻⁴ = [OH⁻] × 1.48 M / 1.42 M
[OH⁻] = (5.4 × 10⁻⁴) × (1.42 M / 1.48 M)
= 5.18 × 10⁻⁴ M
pOH = -log10([OH⁻]):
pOH = -log10(5.18 × 10⁻⁴)
= 3.29
pH + pOH = 14
pH = 14 - pOH
= 14 - 3.29
= 10.71
b. The reaction is H⁺ + (CH₃)₂NH ⇌ (CH₃)₂NH₂⁺
The new concentration of (CH₃)₂NH = 1.42 M - 0.300 mol / 0.250 L
= 1.12 M
New concentration of (CH₃)₂NH₂⁺ = 1.48 M + 0.300 mol / 0.250 L
= 2.68 M
[OH⁻] = (Kb × [CH₃)₂NH]) / [CH₃)₂NH₂⁺]
[OH⁻] = (5.4 × 10⁻⁴) × (1.12 M) / (2.68 M)
[OH⁻] = 2.25 × 10⁻⁴ M
pOH = -log10(2.25 × 10⁻⁴)
= 3.65
pH = 14 - pOH = 14 - 3.65
= 10.35
C. The reaction is OH⁻ + (CH₃)₂NH₂⁺ ⇌ (CH₃)₂NH + H₂O
Change in concentration of (CH₃)₂NH = +0.120 mol
Change in concentration of (CH₃)₂NH₂⁺ = -0.120 mol
New concentration of (CH₃)₂NH = 1.42 M + 0.120 mol / 0.250 L = 1.91 M
New concentration of (CH₃)₂NH₂⁺ = 1.48 M - 0.120 mol / 0.250 L = 0.712 M
Use the equation for the reaction:
OH⁻ + (CH₃)₂NH₂⁺ ⇌ (CH₃)₂NH + H₂O
[OH⁻] = (CH₃)₂NH] × [OH⁻] / [(CH₃)₂NH₂⁺]
[OH⁻] = (1.91 M) × (0.120 mol) / (0.712 M)
[OH⁻] = 0.323 M
Use the equation pOH = -log10([OH⁻]):
pOH = -log10(0.323) = 0.49
pH = 14 - pOH
= 14 - 0.49
= 13.51
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Balancing Chemical Equations & Identifying Chemical Reactions
Balance the Equation Identify the Type of Chemical Reaction
_____P4 + __5__O2 _____P4O10 Combustion
_____Al2O3 _____Al + _____O2
Al: Al:
O: O:
_____H2O2 _____H2O + _____O2
H: H:
O: O:
_____CH4 ______C2H6 + _____H2
C: C:
H: H:
_____C + _____H2 _____C2H6
C: C:
H: H:
_____Fe + _____H2O _____Fe3O4 + _____H2
Fe: Fe:
H: H:
O: O:
_____N2 + _____H2 _____NH3
N: N:
H: H:
_____Na + _____O2 _____Na2O
Na: Na:
O: O:
_____NaCl + _____CaSO4 _____Na2SO4 + _____CaCl2
Na: Na:
Cl: Cl:
Ca: Ca:
SO4 : SO4:
_____C2H6 + _____O2 _____CO2 + _____H2O
C: C:
H: H:
O: O:
_____K + _____B2O3 _____K2O + _____B
K: K:
B: B:
O: O:
_____Na + _____NaNO3 _____Na2O + _____N2
Na: Na:
N: N:
O: O:
Challenge:
_____CH3CH2CH2CH3 + _____O2 _____CO2 + _____H2O
Answers
Calculate the current needed to provide 30000C of electricity In 5 minute
Answers
Refer to below for step-by-step explanation,
Calculemos la formula empirica y molecular de carbonato de hierro Fe2(co3)3.Fe.38.3%C.12.3%.0.4 92% masa 292g
Answers
Respuesta:
292 g / mol;
Por favor, consulte la explicación.
Explicación:
El número de átomos de cada elemento en el compuesto: Fe2 (co3) 3.
Fe = 2; C = 3; 0 = 3 * 3 = 9
Fe2 = 112 g / mol
C = 12 g / mol
O = 16 g /
Masa molecular = ((112 + (12 * 3) + (16 * 9)
= (112 + 36 + 144)
= 292 g / mol.
Total = 2 + 3 + 9 = 14
Fe2 = 112/292 * 100% = 38,356%
C = 36/292 * 100% = 12,328 * '
O = (16 * 9) / 292 * 100% = 49,32%
how many meals would you get if you were to go on a flight to mars from earth
Answers
Each crew member receives three wholesome meals daily along with snacks. The food for each astronaut is kept onboard the Shuttle and is given a unique color dot to identify it.
This is further explained below.
What is Mars?Generally, Being bigger than only Mercury, Mars is the second-smallest planet in the Solar System and is located four planets from the Sun. The Roman god of battle is the inspiration for the name of Mars in English.
It provides each member of the crew with three meals that are well-balanced, in addition to snacks. On board the Space Shuttle is where all of the astronauts' food is kept, and each individual box has a colorful dot that identifies it.
In conclusion, For example, traveling to Mars and returning may take more than three years and need the supply of thousands of kg of food. If the crew of four were to consume merely three meals per day while on their three-year voyage to Mars, they would need to bring more than 24,000 pounds (10,886 kilograms) of food with them.
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You know that a gas in a sealed container has a pressure of 111 kPa at 300 K. What will the
pressure be if the temperature rises to 450 K?
Answers
Which is the correct theory about the solar system: sun-centered or Earth-centered? Why?
Answers
Answer:i dont know thats why imon her
Explanation:
Existe una especie de pájaro en las islas Galápagos que puede ejercer una fuerza de 205N (Newton) con un pico para romper una semilla. Si su pico se desplazó 0,004m durante esta operación, ¿cuánto trabajo realiza el pájaro para conseguir la semilla? Ayuda por favor
Answers
Answer:
In order to calculate the work that the spike did, you have to respect the following equation:
WORK = FORCE X DISPLACEMENT X COS (0)
Explanation:
Work is measured in joules, and is the amount of energy a body needs to make a certain force over a certain distance.
In the case of this bird we would be calculating with the equation written up in the previous item the work that said animal would do to grind a seed.
Calculate the mass of water needed to prepare 45 g of salt solution if the salt content in the solution is 12%.
Answers
The mass of water needed to prepare 45 g of salt solution if the salt content in the solution is 12% is 330g.
The solute is the thing that needs to dissolve, and the solvent is the thing that needs to dissolve it. With a wide variety of solutes and solvents, solutions can be created. We are aware of a wide range of solutions.
Given,
Mass of the salt solution (Solute) = 45g
salt content in the solution = 12%
Let Mass of water = x
Total mass of solution = 45 + x
Concentration of solution = Mass of solute / Mass of Solution × 100
⇒ 12 = 45 / 45 + x × 100
⇒ 12/100 = 45 / 45 + x
⇒ 0.12 = 45 / 45 + x
⇒ 0.12 (45 + x) = 45
⇒ 5.4 + 0.12x = 45
⇒ 0.12x = 45 - 5.4
⇒ x = 330g
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Where can you find a common homogenous mixture?
A salt
B coffee
C orange juice
D trail mix
Answers
Answer:
B. Coffee
Explanation:
Coffee is a common homogenous mixture.
pliz answer 1 & 2 .... I'll tag best answer brainliest .... no spamming
Answers
1,chlorine ions
2,sodium chloride
A pure substance __________ . must be an element. can be separated into simpler substances by physical means. has different chemical and physical properties depending on its source. can be separated into simpler substances by chemical means.
Answers
Answer:
a pure substance has different chemical and physical properties depending on its source
Một hỗn hợp X gồm CH3OH; C2H5OH; phenol có khối lượng 28,9 gam phản ứng vừa hết với 100ml dung dịch NaOH 2M. Phần trăm theo khối lượng phenol là ? Biết C = 12; O = 16; H = 1; Na = 23. *
Answers
Answer:
nNaOH = 0,2 mol
Trong hỗn hợp các chất đề bài cho chỉ có phenol tác dụng với NaOH
C6H5OH + NaOH → C6H5ONa + H2O
0,2 ← 0,2 (mol)
⟹ mphenol = 0,2.94 = 18,8 gam
⟹
%mC6H5OH=18,8/28,9 x100%= 65,05%
Explanation:
Question 22 write the chemical symbols for three different atomic cations that all have 26 protons
Answers
The chemical symbol of an element represents the identity of the element, and the number of protons in the nucleus of an atom determines the identity of the element.
Therefore, any cation with 26 protons will be an isotope of iron (Fe), as iron has an atomic number of 26. Three different cations with 26 protons could be:
Fe₂+ - this is the iron(II) ion, which has lost two electrons and therefore has a charge of +2.Fe₃+ - this is the iron(III) ion, which has lost three electrons and therefore has a charge of +3.Fe₄+ - this is a hypothetical cation of iron that has lost four electrons and therefore has a charge of +4. However, this cation is not stable under normal conditions, and is unlikely to exist in nature.Learn more about “ chemical symbol“ visit here;
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What are 5 pros of coal of energy?
Answers
Answer:
What are the pros of coal energy? ans :
Huge Global Reserves.
Not an Intermittent Energy Source.
Reliable Fuel.
Inexpensive Energy Source.
Minimal Wastes, Consumable Byproducts
Smokeless Alternatives
Compatible With Other Energy Sources.
What volume of hydrogen will produced at 1.45 atm and a tempeture of 20C by the reaction of 37.6g of magnesium 1Mg+2H2O--> Mg(OH)2+H2
Answers
Answer:
V = 25.7 L.
Explanation:
Hello there!
In this case, according to the given information, it turns out possible for us to solve for the volume of hydrogen, by firstly calculating the moles of this gas produced by 37.6 g of magnesium, according to the 1:1 mole ratio between them:
\(n_{H_2}=37.6gMg*\frac{1molMg}{24.305gMg}*\frac{1molH_2}{1molMg}=1.55molH_2\)
Now, we use the ideal gas equation:
\(PV=nRT\)
To solve for the volume, and obtain:
\(V=\frac{nRT}{P}\\\\V=\frac{1.55mol*0.08206\frac{atm*L}{mol*K}*293.15K}{1.45atm}\\\\V=25.7L\)
Regards!