How much heat is required to melt 26.0 g of ice at its melting point?
Answers
Answer:
Heat required to melt 26.0 g of ice at its melting point is 8.66 kJ.
Explanation:
Number of moles of water in 26 g of water: 26× moles
=1.44 moles
The enthalpy change for melting ice is called the entlaphy of fusion. Its value is 6.02 kj/mol.
we have relation as:
q = n × ΔH
where:
q = heat
n = moles
ΔH = enthalpy
So calculating we get,
q= 1.44*6.02 kJ
q= 8.66 kJ
We require 8.66 kJ of energy to melt 26g of ice.
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What is the kinetic energy of the skier at a height of 60 meters above ground? (3 points)a.20,000 units, because total energy remains unchanged b. 80,000 units, because total energy remains unchanged c. 20,000 units, because total energy of the skier decreases d. 80,000 units, because total energy of the skier decreases
Using only the periodic table, write the symbol of the ion most typically formed by each of thefollowing elements:a. Kd. Cib. Cac. S e. Ba f. Br
B. 0.250 mole LiCl dissolved in 250 ml of solution
C. Both the same
Answers
The higher concentrated solution is 0.250 mole LiCl dissolved in 250 ml of solution
( B).0.250mole of LiCl diluted in 250ml solution
Explanation:
Procedure to find the intensity of the solution:
To find the intensity of the solution, we have to use the following formula
M1V1=M2V2
250mL of a 0.500 M aqueous solution of LiCl is diluted with water
250 ml of a 0.250M aqueous solution of LiCl is diluted with water
Thus the PH level of a solution increases from ascending order, Therefore the Solution with 62.5M is a higher concentration than that of the solution with 125M.
Answers
The calories or therms of a fire equal a certain amount of mass.
When MATTER (Electron) and ANTI-MATTER (Positron) collide they don't inhillate each other with nothingness, they always realse TWO gamma particles.
The ENERGY of the TWO gamma particles CONSERVES the MASS of the ELECTRON and The POSITRON
This is what Einstein meant by E=mc2
ENERGY has physical properties than can be measured.
These properties equal the mass that no longer exists after you measure the mass BEFORE and AFTER
The AFTER MASS + the ENERGY MUST equal the BEFORE MASS to at least 99.999%
You must take heat, light and other PARTICLES into consideration.
Their MASS plus their ENERGY
Answer:
this can be explained in terms of the Law of Conservation of mass because you just have to multiply the number of amount that was lost during the fire by 5
Explanation:
so if they lost 489 miles of mass from the fire, then u will have to multiply 489 by 5. 489x5=2445
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Answers
Answers
Answer:
Mg has two valence electrons
Explanation:
Na has only one valence electron, so it readily donates that electron to other atoms to achieve an octet.
Mg must lose two valence electrons to get an octet. It takes extra energy to remove the second electron. In addition, the two electrons are in a filled s subshell, which has added stability.
Answers
Final answer:
The frequency of the light emitted by the laser pointer is approximately 5.64 x 10ⁱ⁴ Hz, as calculated using the speed of light and the specific wavelength of the light.
Explanation:
To calculate the frequency of the light emitted by the laser pointer, you can use the equation c = fλ, where c represents the speed of light in vacuum (approximately 3.00 × 10⁸ m/s), f is the desired frequency, and λ represents the given wavelength of the light (in this case, 5.32 x 10⁻⁷ m).
By rearranging the equation to solve for frequency (f = c/λ), you can substitute in the given values: f = (3.00 × 10⁸ m/s) / (5.32 x 10⁻⁷ m), which yields a frequency of approximately 5.64 x 10ⁱ⁴ Hz. Therefore, the frequency of the light emitted by the laser pointer is about 5.64 x 10ⁿ⁴ Hz.
It's important to understand that light acts as a wave, and every color of light has a unique frequency, which correlates with its wavelength. The wavelength and frequency of light determine many its characteristics, including the color we perceive.
Learn more about Light Frequency here:
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