Answer:
Fossil fuels contribute to greenhouse gases, which is one of their major disadvantages. The most harmful for the environment is coal because it has many more harmful combustion products than other fossil fuels.
The vapor pressure of water at 25c is 23.76 torr. if 1.25g of water is enclosed in a 1.5l container, will any liquid be present? if so, what mass of liquid?
Mass of liquid present in the container:
Yes, the liquid will be present, and of 1.2481 g
Calculation:
Given:
Volume = 1.5L
Temperature = 25 + 273 = 298K
P = 23.76 torr = 0.0312 atm
Using the ideal gas equation:
PV = nRT
Where:
P: PressureV: Volumen: number of molesR: gas constant = 0.0821 L atm [tex]K^{-1}[/tex] [tex]mol^{-1}[/tex]T: Temperaturemaking n subject of formula:
n = [tex]\frac{PV}{RT}[/tex]
By putting all the values in the given equation, we get,
n = 0.0312 x 1.5 / 0.0821 x 298
n = 0.0019 moles
So, 0.00189 are moles of water in the vapor
Now, subtract 1.25g of water from moles of water vapor, and we will get the mass of the liquid left,
1.25 - 0.0019 = 1.2481 g
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8. A 15.0 gram unknown piece of metal at 99 oC is added to 75 grams of water at 23 oC. The final temperature of the metal and water is 26 oC. What is the specific heat of the unknown metal? (Remember that the specific heat of water is 4.18 J/g* oC.)
The specific heat of the unknown metal is 0.859 J/g⁰C.
Specific heat of the unknown metal
Heat lost by the unknown metal = Heat gained by water
m₁c₁Δθ₁ = m₂c₂Δθ₂
where;
c₁ is specific heat of the unknown metalc₂ is specific heat of water(15)(c₁)(99 - 26) = (75)(4.18)(26 - 23)
1095c₁ = 940.5
c₁ = 940.5/1095
c₁ = 0.859 J/g⁰C
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The conversion of 1 mol of fructose 1,6-bisphosphate to 2 mol of pyruvate by the glycolytic pathway results in a net formation of:
Net Product formed:
The conversion of 1 mol of fructose 1,6-bisphosphate to 2 mol of pyruvate by the glycolytic pathway results in a net formation of 2 mol of NADH and 4 mol of ATP.
Glycolysis:
The energy-intensive stages also known as the first half of glycolysis. It divides the six-carbon sugar molecule evenly into two three-carbon molecules. The energy-releasing stages, or the second half of glycolysis, draw energy from the molecules and store it as ATP and NADH, the reduced form of NAD.
Two pyruvate molecules form the final product of glycolysis, which begins with glucose and two ATP molecules and two NADH molecules are gained by the cell as a net result.
The first half of the process requires the utilization of two ATP molecules to set up the six-carbon ring for cleavage. But since this pathway is starting from fructose 1,6-bisphosphate, the utilization step is omitted thus four molecules of ATP and two molecules of NADH are produced in total.
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The electron configuration of an element is 1s22s22p¹. How many valence electrons does the element have
a) 1
b) 2
c)3
d)4
Answer:
[tex]\huge\boxed{\sf 3 \ electrons}[/tex]
Explanation:
Electronic configuration:[tex]1s^22s^22p^1[/tex]
The outermost/valence shell is the second one, seeing from the electronic configuration.
Valence electrons:= 2 + 1 = 3 (electrons are raised to the power in the electronic configuration)
Since, the valence shell here is 2, the electrons of second shell will be counted as valence electrons.
[tex]\rule[225]{225}{2}[/tex]
How many grams of carbon are contained in one mole of C3H8?
Answer:
The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles C3H8, or 44.09562 grams
What is the temperature of 0.460 mol of gas at a pressure of 1.2 atm and a volume of 12.5 L ? Express your answer using two significant figures.
The temperature is 370K.
The volume of a given fuel pattern is immediately proportional to its absolute temperature at regular pressure (Charles's law). The volume of a given amount of fuel is inversely proportional to its pressure whilst temperature is held steady (Boyle's regulation).
Density is immediately proportional to stress and indirectly proportional to temperature. As stress increases, with temperature constant, density will increase. Conversely when temperature increases, with strain regular, density decreases.
The equations describing those legal guidelines are unique cases of the best gasoline regulation, PV = NRT, wherein P is the pressure of the gas, V is its extent, n is the number of moles of the gas, T is its kelvin temperature, and R is the ideal (common) gas constant.
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In an endothermic reaction, what happens to the surroundings?
A. The bond energy is greater than 600 kJ.
B. The bond energy is less than 600 kJ.
C. The temperature increases.
D. The temperature decreases.
Answer: the temperature decreases
Explanation:
- An endothermic reaction absorbs heat which is taken from its immediate surroundings, causing the temperature to decrease
hope this helps :)
calculate the electrons in 2.3 kg sodium
Answer:
6.627 x10^26 electrons
Explanation:
Each Na atom has 11 electrons
Mole weight = 22.989 gm/mole
2300gm /22.989 gm/mole * 6.022 x 10^23 atoms/mole * 11 electrons/atom
= 6.627 x 10 ^26 electrons
i will mark brainliest. Calculate the wavelength corresponding to a frequency of 98.8MHzl
Answer:
3.0395m
Explanation:
The Ksp of Al(OH)3 is 2.0 x 10-31 at 298 K. What is \DeltaGo (at 298 K) for the precipitation of Al(OH)3 according to the equation below?
Al3+(aq) + 3OH- (aq) -> Al(OH)3 (s)
ΔG° = -RT ln K
ΔG° = -RT ln 1/Ksp (reverse reaction, solid (Al(OH)₃ not count for equilibrium constant-K)
ΔG° = -RT ln 1/Ksp
ΔG° = -8.314 x 10⁻³ x 298 ln 1/(2 x 10⁻³¹)
ΔG° = -175.132 kJ/mol
PLEASE HELP !!!
Which two elements have the same number of dots around their chemical symbols in their electron dot diagrams.
The two elements have the same number of dots around their chemical symbols in their electron dot diagrams are: (C). P and As
Meaning of chemical symbolsChemical symbol can be defined as a representation of an element using letters.
Chemical symbol are given to each element distinctively and this is an easier way to represent an element.
Some examples of chemical symbols are; O for oxygen, Zn for zinc, and Fe for iron etc.
In conclusion, The two elements have the same number of dots around their chemical symbols in their electron dot diagrams are: (C). P and As
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D. how many milliliters of a 0.8 m solution of citric acid would be needed to react with 15 grams of baking soda
The volume of 0.8 M solution of citric acid required would be 75mL.
Given:
Concentration of citric acid =0.8M
Mass of baking soda = 15 g
Balanced chemical equation for the reaction of baking soda(NaHCO₃ ) with citric acid (C₆H₈O₇) is:
C₆H₈O₇ + 3NaHCO₃ -----> 3H₂O + 3CO₂ + Na₃C₆H₅O₇
Therefore, 1 mole of citric acid needs 3 moles of baking soda
Molar mass of baking soda = 84g/mol
No. of moles of baking soda = mass of baking soda / molar mass of baking soda = 15g ÷ 84g/mol = 0.178 moles
Thus no. of moles of citric acid required = (1 ÷ 3) × 0.178mole =0.06mole
Molarity = no. of moles of / volume (in mL) x 1000
Volume of citric acid solution required= (0.06mole ÷ 0.8M) × 1000ml
=75ml
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What would be the vital capacity be for a man that has a tidal volume of 500mL, a residual volume of 1100 mL, an expiratory reserve of 1100 mL and an inspiratory reserve of 3000 mL
The vital capacity will be 4600ml.
What is vital capacity?The highest amount of air a person can inhale following their maximal exhalation is known as their vital capacity. It is equivalent to the total of the inspiratory, tidal, and expiratory reserve volumes. It roughly corresponds to Forced Vital Capacity. A wet or conventional spirometer can assess a person's vital capacity.
Normal people have a 3 to 5-liter vital capacity.
It enables simultaneous inhalation of the greatest possible volume of clean air and exhalation of the greatest possible volume of stale air. So, by increasing gaseous exchange between the body's various tissues, it improves the amount of energy available for bodily function.
VC = TV₊IRV₊ERV
where,
VC = Vital capacity
TV = Tidal volume
IRV = inspiratory reserve volume
ERV = expiratory reserve volume
VC = 500 ₊ 3000 ₊ 1100
VC = 4600ml
Therefore, the vital capacity will be 4600ml.
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A mixture of 0.0636 g of hydrogen and 0.0315 mol of oxygen in a closed container is sparked to initiate a reaction. How many grams of water can form
0.03154 mol H₂O is formed from 0.0636 g of hydrogen if we consider that O₂ is a limiting reagent.
The balanced equation is
[tex]2H_{2} (g)[/tex] + [tex]O_{2} (g)[/tex] → [tex]2H_{2} O (l)[/tex]
Here, we are calculating the moles [tex]H_{2}O (l)[/tex] from the moles of H₂ if we consider O₂ is a limiting reagent:
Given:
The mass of H₂ = 0.0636 g
We know that,
The moles of H₂ = (0.0636 g of H₂) × [tex]\frac{1.0 mol H_{2} }{2.016 g H_{2} }[/tex]
= 0.03154 mol H₂
Moles of H₂O (l) from H₂ = ( 0.03154 mol H₂) × [tex]\frac{2.0 mol of H_{2} O (l)}{2.O mol H_{2} }[/tex]
= 0.03154 mol H₂O
Therefore, 0.03154 mol H₂O is formed from 0.0636 g of hydrogen if we consider that O₂ is limiting reagent.
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how do gas molecules move across a room
Answer:
It expands to its secluded area.
Explanation:
Any substance that is heated will have its molecules and atoms move more quickly, expanding the distance between them all. The term "expansion" is used more frequently to describe this growth in space. Heat causes all stuff, including solids, liquids, and gases, to expand.
In some cases, heating solids causes them to transform into liquids. However, they could revert to their solid state after cooling. Similar to this, certain liquids turn into gaseous states when heated. Instead of altering their condition, gases, on the other hand, frequently expand and raise the pressure inside a container.
Scientists typically blow up balloons to test the expansion of gases, exposing some to the light while leaving others at room temperature. It is demonstrated that heat causes gases to expand when balloons exposed to the sun grow in size while those at ambient temperature remain unchanged.
In a sample consisting of 2.50 g of methane (CH4), there are _____ x 1023 atoms present. Complete the number using standard scientific notation.
In a sample consisting of 2.50 g of methane (CH4), there are 4.5 × 10²³ atoms present.
How to calculate the number of mole ?To calculate the number of moles it is expressed as
Number of moles = [tex]\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
= [tex]\frac{2.50\ g}{16\ g/mol}[/tex]
= 0.15 mol
1 mole of methane contains 6.022 × 10²³ molecules
0.15 mole of methane will contain
= [tex]\frac{0.15 \times 6.022 \times 10^{23}}{1}[/tex]
= 0.9 × 10²³ molecules
= 0.9 × 10²³ × 5 atoms
= 4.5 × 10²³ atoms of methane
Thus from the above conclusion we can say that In a sample consisting of 2.50 g of methane (CH4), there are 4.5 × 10²³ atoms present.
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2. A chemical analysis of a sample provides the following elemental data:
364.8 g C
61.2 g H
324.0 g 0
Determine the empirical formula for this compound.
Answer:
C3 H6 O2
Explanation:
first divide their mass by their respective molar mass, we get:
30.4 moles of C
61.2 moles of H
20.25 moles of O
now divide everyone by the smallest one of them then we get
C= 1.5
H= 3
O= 1
since our answer of C is not near to any whole number so we will multiply all of them by 2
so,
C3 H6 O2 is our answer
A 2.0 L party balloon at 98 kPa is taken to the top of a mountain where the pressure is 75
kPa. Assume that the temperature and chemical amount of the gas remain the same,
determine the new volume of the balloon.
Answer:
2.61 L
Explanation:
p1v1 = p2v2
p1v1 / p2 = v2
98 * 2 / 75 = v2 = 2.61 L
The diagram below shows the different phase transitions that occur in matter. Three bars are shown labeled Solid, Liquid, and Gas. They are connected by arrows labeled 1 to 6. Arrow 1 points from liquid to gas; arrow 2 from solid to liquid, arrow 3 from solid to gas, arrow 4 from gas to liquid, arrow 5 from liquid to solid, and arrow 6 from gas to solid. Which arrow would most likely represent the phase change that involves the same amount of energy as arrow 1? 2 3 4 5 Mark this and r
The arrow that will represent the phase change that involves the same amount of energy as arrow 1 will be arrow 4.
Phase changeArrow 1 represents a phase change from liquid to gas while arrow 4 represents a phase change from gas to liquid.
In other words, arrow 1 and arrow 4 are direct opposites of one another,
This means that if X amount of energy is required for arrow 1, the same amount of energy will be needed for arrow 4 but in the reverse direction.
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Answer:
The correct answer would be option C. 4!
Explanation:
Hope this helped confirm :)
I just got this question right on Edge :P
Protons Ha and Hb in the compound given are _________. homotopic enantiotopic diastereotopic mesotopic none of these
Protons Ha and Hb in the compound given are enantiotopic.
What are enantiotopic protons?Enantiotopic protons can be defined as those protons that can be replaced by another groups like deuterium.
What is a compound?A compound is a substance which contains two or more elements chemically combined together.
So therefore, Protons Ha and Hb in the compound given are enantiotopic.
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What is a list of quantities of components, ingredients, and materials required to make a product?.
Answer:
The list of quantities of components, ingredients, and materials required to produce a product is the. master schedule.
mention one real life significance of the covalent bond.
Answer:
it helps in respiration
The manhattan project was responsible for the creation of _____. the atomic bomb the hydrogen bomb the first satellite the aswan dam
Which bomb was created as a part of the manhattan project?
The manhattan project was responsible for the creation of the atomic bomb.
What was the manhattan project?
The first nuclear weapons were created as a result of the Manhattan Project's research and development efforts during World War II. With the help of the United Kingdom and Canada, it was spearheaded by the United States. Major General Leslie Groves of the U.S. Army Corps of Engineers oversaw the project from 1942 to 1946. Robert Oppenheimer, a nuclear physicist, served as the lab's director and was responsible for the actual bomb's design, the atomic bomb.
As the Army's first headquarters were located in Manhattan, the project's Army component was given the moniker Manhattan District, gradually replacing the official codename for the entire project, Development of Substitute Materials. The project eventually absorbed Tube Alloys, its previous British counterpart. The Manhattan Project started out small in 1939, but it eventually employed over 130,000 people and cost close to US$2 billion (about $23 billion in 2020). Less than 10% of the cost went toward the design and production of the weapons, with more than 90% going toward the construction of factories and the production of fissile material. More than thirty locations in the United States, the United Kingdom, and Canada were used for research and production.
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In an electrolytic cell, the electrode that acts as a source of electrons to the solution is called the __________; the chemical change that occurs at this electrode is called __________.
In an electrolytic cell, the electrode that acts as a source of electrons to the solution is called the cathode; the chemical change that occurs at this electrode is called reduction.
Define Electrolyte:-An electrolyte is a material that separates into charged ions when it is in contact with water. Cations are positively charged ions. Anions are ions that are negatively charged. A substance that may conduct an electric current when melted or dissolved in water is known as an electrolyte.
Electrochemical cellThere are three main categories of electrochemical cells. the galvanic cell, the concentration cell, and the electrolytic cell. These cells all share the same four fundamental components. These are the elements
The electrolyte serves as the conduit for current flow between the anode and the cathode. In an aqueous solution, it normally is homogeneous, but in moist soil, the concentration or kind of dissolved compounds may vary locally.The anode, which can conduct electricity and is in contact with the electrolyte, corrodes when it combines with the chemicals in the electrolyte.A metal also contacts the electrolyte at the cathode. It is protected from corrosion rather than corroded.Anode and cathode are connected by the conductor, which also completes the circuit.Learn more about Electrochemical cells here:-
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500 ml of nitrogen and 500 ml of hydrogen are kept together in one vessel at the same constant temperature and pressure. Which of the following is true for their number of molecules?
A. NN2 > NH2
B. NN2 < NH2
C. NN2 = N H2
D. NN2 + NH2 = 1 mole
The number of molecules of nitrogen will be the same as the number of molecules of hydrogen. The correct option is C.
What is Avogadro's law?The law states that different gases of the same volume stored at the same temperature and pressure will contain the same number of molecules.
Going by Avogadro's law, 500 ml of nitrogen and 500 ml of hydrogen kept together in one vessel at the same constant temperature and pressure will have the same number of molecules.
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A mixture of He , Ar , and Xe has a total pressure of 3.00 atm . The partial pressure of He is 0.200 atm , and the partial pressure of Ar is 0.200 atm . What is the partial pressure of Xe ? Express your answer to three significant figures and include the appropriate units.
The partial pressure of Xe is 2.60atm
The sum of the partial pressures is equal to the total pressure. Ptotal = P1 + P2 + P3... .To calculate the partial pressure of one of the components of a mixture, subtract the sum of known partial pressures of the other components from the total pressure.
Given the values of
PHe=0.20 atm
PAr=0.20 atm
Ptotal=3.00 atm
We need to find PXe
Solution: Determine the sum of the partial pressures of helium and argon, then subtract the sum from the total pressure.
PHe+PAr =0.20 atm + 0.20=0.400 atm
PXe=3.00atm−0.400=2.60 atm
Each gas that makes up a mixture of gases has a partial pressure, which is the notional pressure of that gas as if it alone filled the original combination's complete volume at the same temperature.
According to Dalton's Law, a perfect gas mixture's total pressure equals the sum of its constituent gases' individual partial pressures.
The thermodynamic activity of a gas's molecules is gauged by its partial pressure.
Gases react, disperse, and dissolve based on their partial pressures rather than the concentrations they have in liquids or other gas combinations.
This general characteristic of gases holds true in biological chemical interactions involving gases.
Hence the partial pressure of Xe is 2.60atm
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How does the concentration of the solute relate to the osmolarity of the solution and osmot- ic pressure
The concentration of the solute is directly proportional to the osmolarity of the solution and osmotic pressure.
What is the relationship between the osmolarity and the concentration of a solute?The measure of the amount of solute that has been dissolved in a solution or solvent is said as the concentration of the solute.Osmolarity is nothing but the total concentration of solutes in the solution. A solution with high osmolarity has more solute particles in the solution and with low osmolarity has fewer solute particles in the solution.So, the concentration of the solute is directly proportional to the osmolarity of the solution. (per liter)How does the osmotic pressure and the concentration of the solute are related?The pressure required to stop the flow of solvent across the osmosis membrane(semipermeable membrane) is known as osmotic pressure.When the concentration of the solute increases the osmotic pressure also increases.When the concentration of the solute decreases the osmotic pressure also decreases.So, the osmotic pressure is directly proportional to the concentration of the solution.Thus, the concentration of the solute directly proportional to the osmolarity of the solution and osmotic pressure.
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In a reaction between iron(II) sulfide and oxygen, iron(III) oxide and
sulfur dioxide are produced. How many moles of O₂ is required to
produce 7.66 moles of Fe₂O3?
4FeS + 70₂ + 2Fe₂O3 + 4S02
a 26.81 moles
b 2.17 moles
c 7.60 moles
d None of the above
Answer:
26.81 moles
Explanation:
From the coefficients of the equation, we know that for every 2 moles of iron(III) oxide produced, 7 moles of oxygen are consumed.
So, the answer is 7.66(7/2), which is 26.81 mol.
What is the empirical formula for a compound if a sample contains 3.72 g of p and 21.28 g of cl? pcl5 pcl3 p2cl10 p2cl5
Answer:
A.) PCl₅
Explanation:
To determine the empirical formula, you need to (1) identify the atomic masses of both elements (from the periodic table), then (2) convert each element from grams to moles (via atomic masses), then (3) divide both elements by the smallest molar value of both, and then (4) construct the empirical formula.
(Step 1)
Atomic Mass (P): 30.974 g/mol
Atomic Mass (Cl): 35.453 g/mol
(Step 2)
3.72 g P 1 mole
--------------- x ------------------ = 0.120 mole P
30.974 g
21.28 g Cl 1 mole
----------------- x ------------------- = 0.600 mole Cl
35.453 g
(Step 3)
Because 0.120 mole is smaller than 0.600 mole, you need to divide both elements by this value to determine the ratio of the elements in the empirical formula.
0.120 mole P / 0.210 mole = 1.00 mole P
0.600 mole Cl / 0.210 mole = 5.00 moles Cl
(Step 4)
The molar value of each element represents the amount of each element in the formula. This value shows itself in the form of subscripts in the formula. This makes the correct empirical formula:
PCl₅
What is the chemical formula for acetic acid?
O CHO
O C₂H4O2
O C₂OH
O C₂0₂H
Answer:
The answer is C2H4O2