The evaporation of 190g of isopropyl alcohol would remove approximately 463.6 kJ of heat.
Explanation:The student asked: 'How much heat is removed from the skin by the evaporation of 190 g (about 1/2 cup) of isopropyl alcohol?' The process of evaporation removes heat from the surface it's occurring on because energy is needed to change a substance from a liquid state to a gaseous one. This is known as the enthalpy of vaporization. Unfortunately, the value provided for the vaporization of water can't be directly used for isopropyl alcohol. However, using related scientific data, the approximate heat of vaporization for isopropyl alcohol is about 2.44 kJ/g. Therefore, to calculate the heat removed by evaporation of 190g of isopropyl alcohol, we would multiply the mass (190g) by the heat of vaporization (2.44 kJ/g) which totals approximately 463.6 kJ.
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To calculate the heat removed by the evaporation of isopropyl alcohol, one would typically multiply the number of moles of the alcohol by its heat of vaporization, which is approximately 45.3 kJ/mol at boiling point; however, the specific heat of vaporization at skin temperature is necessary to determine the exact amount of heat removed.
Explanation:To determine how much heat is removed from the skin by the evaporation of isopropyl alcohol, we need the heat of vaporization for isopropyl alcohol (also known as isopropanol). The heat of vaporization is the amount of heat required to turn a liquid into a vapor without a temperature change. Unfortunately, we do not have the exact heat of vaporization value for isopropyl alcohol at human skin temperature provided in the reference, which would directly allow the calculation. However, we can consider that the heat of vaporization for isopropyl alcohol is typically around 45.3 kJ/mol at its boiling point.
For the sake of explanation, let's assume that this value is close enough to use for a skin temperature of 37 °C. The molar mass of isopropyl alcohol (C3H8O) is approximately 60.1 g/mol. First, we would convert 190 g of isopropyl alcohol to moles:
Moles of isopropyl alcohol = mass (g) / molar mass (g/mol) = 190 g / 60.1 g/mol
Then, we would multiply the moles by the heat of vaporization to get the total amount of heat removed:
Heat removed (kJ) = moles * heat of vaporization (kJ/mol)
Without the exact value for the heat of vaporization of isopropyl alcohol at skin temperature, we cannot provide the exact amount of heat removed. However, this process illustrates how the calculation would be performed given the correct data.
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A(n) ________ chemical reaction releases energy, whereas a(n) ________ reaction requires an input of energy.
Answer:
Exothermic chemical reaction
Endothermic chemical reaction
An Exothermic chemical reaction releases energy, whereas an Endothermic chemical reaction requires an input of energy.
An Exothermic chemical reaction involves the release of heat(thermal energy) in a system to the surroundings. The enthalpy(heat) change which is ΔH decreases in this type of reaction
An Endothermic chemical reaction involves the absorption or input of heat in the form of thermal energy by the system from the surroundings. The enthalpy(heat) change which is ΔH increases in this type of reaction.
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Ammonia nh3 chemically reacts with oxygen gas o2 to produce nitric oxide no and water h2o . what mass of water is produced by the reaction of 8.45g of oxygen gas? round your answer to 3 significant digits.
In the reaction, each mole of O2 produces 1.2 moles of H2O. By converting the mass of O2 in the problem to moles (using O2's molar mass), multiply by 1.2 to find moles of H2O, and then converting moles of H2O to grams (using H2O's molar mass), the problem can be solved.
Explanation:This question concerns the reaction of ammonia (NH3) with oxygen gas (O2) to produce nitric oxide (NO) and water (H2O). This is an oxidation-reduction reaction. The balanced equation for the reaction is actually 4NH3 (g) + 5O2 (g) -> 4NO (g) + 6H2O (g). Oxygen's molar mass is 32.00 g/mol, the molar mass of water is 18.02 g/mol. Therefore, for every 5 mol of O2, 6 mol of H2O are produced, or every 1 mol of O2 produces 1.2 mol of H2O (6/5). So, you can calculate the number of moles of gas in 8.45 g then multiply by 1.2 to get the number of moles of H2O, and finally multiply this by the molar mass of H2O to find the mass in grams. The final answer can be rounded to 3 significant digits.
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A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm. What is the molar mass of the unknown compound?
A car travels at 15 kilometers west in 10 minutes after reaching the destination the car travels back to the starting point again taking 5 minutes what is the average velocity of the car
Answer: D 2.0 meters/second
Explanation:
Convert 112°C to Kelvin.
Answer:
112 °C = 385 K
Explanation:
The relation between Kelvin and Celsius degrees is
0°C = 273.15 K
To convert the temperature from Celsius to Kelvin we must add 273.15:
112 °C + 273.15 = 385.15 K
With the correct significant figures the answer would be 385 K
A covalent bond between two atoms occurs when the atoms
Covalent bonds between atoms form when these atoms share one or more pairs of their valence electrons. This is a pathway to stability for the atoms involved. This type of bonding happens in many compounds, such as in a molecule of hydrogen.
Explanation:A covalent bond between two atoms occurs when these atoms share one or more pairs of their valence electrons. In this type of bonding, both atoms contribute at least one electron to the shared pair. This is a way for both atoms to achieve a stable electron configuration, often completing an outer shell of electrons.
For example, consider the hydrogen molecule, H2. Hydrogen has one valence electron and needs two for stability, so two hydrogen atoms can share their electrons to form a covalent bond, resulting in a stable molecule.
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Which configuration of a phospholipid would you expect to see in the presence of water?
Problem page write a balanced half-reaction for the reduction of solid manganese dioxide mno2 to manganese ion mn 2 in acidic aqueous solution. be sure to add physical state symbols where appropriate.
In a reduction reaction, some electrons are gained by the substance being reduced. The balanced half-reaction to this would be:
MnO2(s) + 4 H+ (aq) + 2e ---> Mn^2+ (aq) + 2 H2O (aq)
It is called balanced reaction since the number of each element in the left side is equal to the number of each element on the right side.
The balanced half-reaction for the reduction of solid manganese dioxide (MnO2) to manganese ion (Mn^2+) in acidic aqueous solution is: 2MnO2 (s) + 4H+ (aq) + 2e- -> Mn^2+ (aq) + 2H2O (l).
Explanation:The balanced half-reaction for the reduction of solid manganese dioxide (MnO2) to manganese ion (Mn^2+) in acidic aqueous solution is:
2MnO2 (s) + 4H+ (aq) + 2e- → Mn^2+ (aq) + 2H2O (l)
In this reaction, the solid manganese dioxide is reduced to manganese ion by gaining two electrons, and four hydrogen ions are involved in the reaction to balance the charges.
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Aluminium chloride dissolved in Water =? When you dissolve aluminium chloride in water, what is the balanced chemical equation? NOTE: Not a chemical reaction, just dissolving.
When the volume of a gas is changed from 3.6 L to 15.5 L, the temperature will change from oC to 87°C
Answer:
-189.5
Explanation:
Correct with Acellus Chemistry
Aluminum reacts with chlorine gas to form aluminum chloride. 2al(s)+3cl2(g)→2alcl3(s) what minimum volume of chlorine gas (at 298 k and 225 mmhg) is required to completely react with 7.85 g of aluminum
To find the minimum volume of chlorine gas required to react with 7.85 g of aluminum, we convert the mass of aluminum to moles, find the necessary moles of chlorine gas using the balanced equation, and then apply the ideal gas law to find the volume.
Explanation:The question is asking about the volume of chlorine gas required to completely react with a given amount of aluminum. We know from the balanced equation that 2 moles of aluminum (Al) react with 3 moles of chlorine gas (Cl) to form 2 moles of aluminum chloride (AlCl₃). First, we've to convert the mass of aluminum to moles by dividing the mass 7.85g by the molar mass of aluminum (26.98 g/mol), giving approximately 0.291 mol.
From the equation, we know the mole ratio of Al to Cl2 is 2 to 3. Therefore, 0.291 moles of Al will require 0.437 mol of Cl₂. Next, we apply the ideal gas law (PV=nRT) to find the volume. Here, P=225 mmHg (which is 0.296 atmospheres), R=0.0821(atm L)/(mol K), T=298 K and n=0.437 mol.
Finally, solving for V in PV=nRT gives us V = nRT/P, approximating 11.08 L as the minimum volume of chlorine gas required to react.
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What volume of 0.0200 m calcium hydroxide?
Which is expected to have the largest dispersion forces? which is expected to have the largest dispersion forces? c12h26 be cl2 c3h8 f2?
The one I would expect to have the largest dispersion forces would be the largest and heaviest molecule. This is evidenced by the fact that that molecule is a liquid at room temperature while all the others are gases.
C3H8 = This is propane and a gas at room temperature
F2 = Also a gas at room temperature
BeCl2 = This is a solid and forms an extended lattice in the form of Be-Cl-Be bridges therefore dispersion forces are not important
Therefore the answer to this is C12H26 which is a wax and a liquid at room temperature.
Answer:
C12H26
Among the substances listed (C12H26, Be, Cl2, C3H8, F2), the largest dispersion forces are expected in C12H26 due to its larger molecular size and weight. Dispersion forces are temporary shifts in electron density causing attraction between molecules and are much stronger in larger and heavier molecules. Smaller molecules like Cl₂ and F₂ have weaker dispersion forces.
Explanation:The substance expected to have the largest dispersion forces from the ones mentioned (C12H26, Be, Cl2, C3H8, F2) is C12H26 due to its large size and molecular weight. Dispersion forces, also known as London dispersion forces, are temporary shifts in electron density in non-polar molecules that result in attraction between molecules. This is typically stronger in larger and heavier molecules. As C12H26 is a larger, heavier, and more complex molecule than the others listed, it has more electrons, hence more shifting of electron density and stronger resultant dispersion forces.
For other compounds like Cl₂ and F₂, they are gases at room temperature, meaning that their dispersion forces are weaker. This is because dispersion forces influence the boiling and melting points of substances. Larger dispersion forces lead to higher melting and boiling points, which is also why C12H26, a component of diesel and other heavy oils, is a liquid at room temperature.
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Radioactive decay occurs when two nuclei are smashed into each other and combine to form a much larger nucleus and release a vast amount of energy.
True
False
A 1.50-g sample of hydrated copper(ii) sulfatewas heated carefully until it had changed completely to anhydrous copper(ii) sulfate () with a mass of 0.957 g. determine the value of x. [this number is called the number of waters of hydration of copper(ii) sulfate. it specifies the number of water molecules per formula unit of in the hydrated crystal.]
Why is it important to stir the solution in the flask as you add titrant from the buret?
How can a sample of uranium-235 that has critical mass be induced to react? it must be spilt with a laser. it must be fused to a helium nucleus. it must be bombarded with neutrons. it must be shot with light speed electrons?
What is produced when benzene reacts with chlorine in the presence of an iron catalyst?
Silver tarnishes as silver metal reacts with hydrogen sulfide, H2S, in the air. In this reaction, dark silver sulfide, Au2S, covers the surface of silver. When silver is polished, this coating of silver sulfide can be removed from the surface. This makes the silver shiny again. Enter the coefficients that balance the tarnishing reaction equation. (Type 1 for no coefficient.)Ag(s) + H2S(g) → Ag2S(s) + H2(g)
Balanced the tarnishing equation:
2Ag(s) + 1H₂S(g) → 1Ag₂S(s) + 1H₂(g).
According to principle of mass conservation, number of atoms must be equal on both side of balanced chemical reaction.
There are two silver atoms, two hydrogen atoms and one sulfur atom on both side of balanced chemical reaction.
The coefficients that will balance the tarnishing reaction equation are: 2, 1, 1,1
What is a chemical equationChemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
Thus, we can obtain the coefficients that will balance the tarnishing reaction equation by simply balancing the equation:
How to balance the equationAg(s) + H₂S(g) → Ag₂S(s) + H₂(g)
There are 2 atoms of Ag on the right side and 1 atom on the left side. It can be balanced by writing 2 before Ag as shown below:
2Ag(s) + H₂S(g) → Ag₂S(s) + H₂(g)
Thus, the equation is balanced.
The coefficients are: 2, 1, 1, 1
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Which factor is generally responsible for high melting points?
Answer:
High intermolecular forces of attraction.
Explanation:
When the molecules are attracted to each other, it takes more energy (heat) to break that attraction apart. In order to take a substance from a solid to a liquid, you must break these attractions.
Write a balanced equation for the oxidation-reduction reaction that occurs when hydrogen peroxide reacts with ferrous ion
The balanced equation for the reaction of hydrogen peroxide with ferrous ions to produce ferric ions and water in an acidic solution is H2O2(aq) + 2H+(aq) + 2Fe2+(aq) → 2H2O(l) + 2Fe3+(aq).
The balanced equation for the oxidation-reduction reaction that occurs when hydrogen peroxide reacts with the ferrous ion (Fe2+) in an acidic solution to produce ferric ion (Fe3+) and water is:
H2O2(aq) + 2H+(aq) + 2Fe2+(aq) → 2H2O(l) + 2Fe3+(aq)
This reaction showcases the oxidizing property of hydrogen peroxide. The ferrous ion (Fe2+) is oxidized to the ferric ion (Fe3+), while the hydrogen peroxide (H2O2) is reduced to water (H2O).
How many grams of naoh would react with 507 g fecl2 in the reaction fecl2 + 2naoh fe(oh)2(s) + 2nacl?
Answer:ANSWER
Explanation:
Calculate the mass of o2 produced by the decomposition of kclo3 by heating in the presence of manganese dioxide
Copper is which type of solid? molecular solid ionic solid covalent atomic solid metallic atomic solid
Copper is a metallic atomic solid , the atoms are arranged in a regular pattern, with the valence electrons being free to move throughout the structure.Thus, the correct option is metallic atomic solid.
Copper is an example of a metal, and metals typically exhibit metallic bonding, where the valence electrons form a "sea" of delocalized electrons, creating strong bonds between the metal atoms. This allows for the high electrical and thermal conductivity that metals are known for.
Metallic solids are compounds that are entirely comprised of metal atoms that are held together by metallic bonds.Metallic bonding is a type of intramolecular force of attraction that occurs between a lattice of positive ions and a "sea" of delocalized electrons.
Thus, the correct option is metallic atomic solid.
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when the pressure that a gas exerts on a sealed container changes from blank torr to 900 torr the temperature changes from 300 k to 450 k
Answer:
Initial pressure = 600 torr
Explanation:
Given:
Initial pressure, P1 = 900 torr
Initial Temperature, T1 = 300 K
Final temperature, T2 = 450 K
To determine:
Final pressure of gas, P2
Explanation:
Based on the ideal gas equation
[tex]PV = nRT\\[/tex]
where n = moles of gas
R = gas constant, T = temperature
At constant volume (V), the above equation becomes:
P/T = constant
This is Gay-Lussac's law
[tex]\frac{P1}{T1} =\frac{P2}{T2} \\\\P1=\frac{P2}{T2} *T1=\frac{900\ torr}{450\ K} *300\ K=600\ torr[/tex]
10g of an unknown compound are added to water to form a 7.89 molar solution. if 2 liters of solution are present, what is the molar mass of the unknown compound?
To calculate the molar mass of the unknown compound, multiply the solution's molarity (7.89 M) by the volume in liters (2 L) to get the moles of solute, then divide the mass of the compound (10 g) by the calculated moles. The molar mass is found to be approximately 0.63 g/mol.
Explanation:To determine the molar mass of the unknown compound, we first need to calculate the number of moles of the solute that was dissolved in water to form the 7.89 M solution.
Molarity (M) of a solution is given by the number of moles of solute per liter of solution. Since we have a 7.89 M solution and the volume of the solution is 2 liters, we can calculate the number of moles:
Number of moles = Molarity × Volume = 7.89 moles/L × 2 L = 15.78 moles
Next, we use the mass of the unknown compound (10 g) to find its molar mass:
Molar mass = Mass of the compound / Number of moles = 10 g / 15.78 moles
Finally, when we perform this division, we find that the molar mass of the unknown compound is approximately:
Molar mass = 0.63 g/mol
Therefore, the molar mass of the unknown compound is 0.63 g/mol.
What 3 characteristics of matter does chemistry deal with?
The electron stable state configuration in atoms is best seen in the ______ configuration.
inert gas
full d shell
full f shell
full s shell
Jane bought some raisins to keep in her purse as a snack what is one reason raisins dont need refrigeration
Answer: The drying process worked to preserve them
Explanation: apex
Matt made a list of materials that conduct heat and electricity he noted that most materials that conduct heat also conduct electricity Matt concluded that only metals conduct both heat and electricity how would you respond to matt's conclusion
Matt's conclusion that only metals conduct both heat and electricity is partially correct. While most metals do conduct both, there are also non-metal substances, like graphite and ionic solutions, that exhibit these properties.
Explanation:While Matt's observation that many materials that conduct heat also conduct electricity is correct, his conclusion that only metals conduct both heat and electricity is not completely accurate. In fact, there are also some non-metal materials which can conduct heat and electricity. For example, graphite, a form of carbon and a non-metal, has layers of carbon atoms that are free to move and conduct electricity. Similarly, many ionic solutions can also conduct electricity when they are in the liquid state as their ions are free to move.
Conduction of heat and electricity often happens in materials that have free electrons. Metals are a great example of this, but they're not the only example. So, while it's true that most metals do conduct both heat and electricity, it's important to note that they are not the only materials that can do so.
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