Answer:
(a) 0.575 m;
(b) 0.527 m
Explanation:
Let's use the freezing point depression law in each of these cases.
(a) According to the law:
[tex]\Delta T_f = iK_fb[/tex]
Rearrange the equation for molality, b:
[tex]b = \frac{\Delta T_f}{iK_f}[/tex]
NaCl is an ionic substance, 1 mole of it dissociates into 2 moles of ions, sodium ion and chloride ion, this means the van 't Hoff factor i = 2.
[tex]\Delta T_f = T_o - T_n[/tex]
Here:
[tex]T_o = 0.00^oC[/tex] is the initial freezing point of water,
[tex]T_n = -2.14^oC[/tex] is the final freezing point of water.
For water:
[tex]K_f = 1.86^oC/m[/tex]
Applying the equation
[tex]b = \frac{2.14^oC}{2\cdot 1.86^oC/m} = 0.575 m[/tex]
(b) Applying the same equation for the same salt and the same conditions, except a new freezing point, we would expect to obtain:
[tex]b = \frac{1.96^oC}{2\cdot 1.86^oC/m} = 0.527 m[/tex]
Final answer:
The molality of salt in the Atlantic ocean seawater sample is calculated to be 0.575 mol/kg, while the molality in the Arctic ocean seawater sample is calculated to be 0.527 mol/kg. This is determined using the freezing point depression formula.
Explanation:
The subject of this question is the Calculation of Molality based on the observed freezing point depression of seawater samples from the Atlantic and Arctic Oceans. The freezing point depression phenomenon is when the freezing point of a liquid is lowered by adding a solute, such as salt in seawater. The formula to calculate molality (m) is derived from the freezing point depression formula: ΔT = i * Kf * m, where ΔT is the depression of the freezing point, Kf is the cryoscopic constant of water (1.86 °C kg/mol), m is the molality, and i is the van't Hoff factor (which is 2 for NaCl, as it dissociates into two ions).
Steps to Calculate Molality:
Calculate the freezing point depression (ΔT) by subtracting the freezing point of seawater from the freezing point of pure water (0°C).
Apply the formula ΔT = i * Kf * m, where i = 2 for NaCl, Kf = 1.86 °C kg/mol.
Rearrange the formula to solve for m (molality), which gives m = ΔT / (i * Kf).
Calculating for the Atlantic seawater sample: The freezing point depression is 0°C - (-2.14°C) = 2.14°C. Using the rearranged formula:
molality = 2.14°C / (2 * 1.86°C kg/mol) = 0.575 mol/kg
Calculating for the Arctic seawater sample: The freezing point depression is 0°C - (-1.96°C) = 1.96°C. Using the rearranged formula:
molality = 1.96°C / (2 * 1.86°C kg/mol) = 0.527 mol/kg
In conclusion, the molality of salt in the Atlantic ocean seawater sample is 0.575 mol/kg, and in the Arctic ocean seawater sample is 0.527 mol/kg.
When the sun impacts weather, an interaction with the __________ takes place.
atmosphere
biosphere
geosphere
hydrosphere
hint not atmosphere
Final answer:
The hydrosphere is the Earth's water system that interacts with the sun to influence weather patterns through the water cycle, including evaporation and condensation.
Explanation:
When the sun impacts weather, an interaction with the hydrosphere takes place. It is essential to understand that the hydrosphere, which includes all the Earth's water, is not an isolated system but interacts dynamically with other global systems such as the atmosphere, lithosphere, and biosphere. These interactions are part of what is known as the water cycle.
The sun is the primary energy source driving the water cycle by heating water in the hydrosphere, causing it to evaporate. When water vapor cools, it condenses, forming clouds and eventually falling back to Earth as precipitation, such as rain or snow. This continuous movement of water through the hydrosphere and the energy changes accompanying it significantly influence weather patterns on Earth.
Understanding these physical processes is key to studying the intricate and interdependent nature of Earth's systems, which collectively impact our global climate and environment. The hydrosphere, being a critical component of Earth's systems, plays a central role in weather and climate regulation due to its interaction with the sun's energy.
Use the table to determine the mass number of element A.
question is in the picture
Answer:
repelled
Explanation:
like charges repel one another
how are the elements organized on the periodic table
Answer: By atomic number
Answer:
According to the atomic number or number of proton
Explanation:
Three bags containing different number of wooden cubes are dropped from the same height. Which of the following statements is true?
A) Bag A has more kinetic energy than Bag C as it falls
B) Bag C has the most kinetic energy before it was release
C) Bag B has less kinetic energy than Bag A as it falls.
D) Bag A has the least potential energy when it is dropped
Answer:
I don't have the number of cubes in each bag, but whichever bag had the most cubes would have the most kinetic energy as it falls
Why is photosynthesis a chemical reaction?
A because new substances are formed
B. because an input of energy is required
C. because the reactants are compounds
D. because the products include an element
Answer: A.
Explanation: A chemical reaction is a chemical change that occurs when two or more substances combine to form a new substance . Photosynthesis turns carbon dioxide and water into oxygen and carbohydrates, therefore a chemical change occurs.
Answer:
A. Because a new substance is formed.
School Math. Homework.
Six. Mental Half
Cruel. Abuse Of
Hours. To. My
Of. Humans Energy wasted on random knowledge
Are
Lives
In the name of Jesus why does school exist
Answer:
The answer is TRUE!!!
Explanation:
Please mark brainliest... btw try online school... you can do the easiest thing such as: learning photography, basic drawling, digital art and design, web design, painting for beginers, fitness, etc.
If an object has an acceleration of 9.8 m/s and a force of 58.8N what is the mass of an object ? What could the object be
Answer:
The mass of an object is 0.6122 Kg
Explanation:
Given:
Acceleration = 9.8 m/s
Force = 58.8 N
To Find:
Mass of an object = ?
Solution:
We know that according to newtons 2nd law
Force is the product of the mass and acceleration
F= ma
where
F = Force
m = mass
a = Acceleration
Substituting the values,
58.8 = m X 9.8
[tex]m= \frac{58.8}{9.8}[/tex]
m = 0.6122 kg
1. If you run into a curb on a skateboard, you will fall forward off your skateboard because
there is an
force applied to your body.
a. unbalanced
b. balanced
c. net
d. applied
of an object changes
2. Acceleration is the rate at which the
a. distance
b. force
c. motion
d. velocity
Answer:
D)applied
Explanation:
Answer:
i think the answer is unbalanced
Explanation:
Should hydrogen be classified as a member of group 1, group 17, or is it unique? Explain your reasoning behind your choice.
Answer:
Honestly, while Hydrogen appears to be in group 1, it really isn't. It is unique, and has no characteristics similar to others, especially to the alkali metals in group 1 and halogens in group 17.
Hydrogen only shares one thing with alkali metals. It has one electron in the outermost shell, and has a valency of one. As far as halogens go, Hydrogen is a reducing agent, and halogens are known for being oxidizing agents.
So, I can say that more research needs to be done on Hydrogen. In the meantime, it is quite unique. Thanks!
What is the atomic mass of uranium
Answer:
238
Explanation:
To find the atomic mass, you add protons and neutrons
Number of Protons: 92
Number of Neutrons: 146
146+92=238
Which of the following is the substance that enables a leaf to use sunlight to produce food?
Which of the following elements is an example of metal that is not a transition metal?
Question 19 options:
Hg
Pb
Cu
Ag
Calculate the molarity of solution given the following information: 10.0 g of NaOH were dissolved in 500.0 mL of solution. 0.020 M 0.500 M 5.00 M 20.0 M
Answer: 0.5M
Explanation: see attachment for explanation. Thanks!
Final answer:
The molarity of a solution prepared by dissolving 10.0 g of NaOH in 500.0 mL of solution is 0.500 M.
Explanation:
To calculate the molarity of a solution, we need to know the amount of solute in moles and the volume of the solution in liters. The question provides the mass of sodium hydroxide (NaOH) and the volume of the solution.
Solution
Before we start, we must convert the given mass of NaOH to moles using its molar mass, which is 40.00 g/mol:
10.0 g NaOH × (1 mol NaOH / 40.00 g NaOH) = 0.250 mol NaOH
Convert the volume of solution from milliliters to liters:
500.0 mL × (1 L / 1000 mL) = 0.500 L
Use the definition of molarity (M):
Molarity (M) = moles of solute / liters of solution
M = 0.250 mol / 0.500 L = 0.500 M
As a water wave nears the coastline, what happens to the height and speed of the wave?
A
Wave height increases, and wave speed decreases.
B
Wave height decreases, and wave speed increases.
C
Wave height increases, and wave speed remains the same.
D
Wave height decreases, and wave speed decreases
Answer:
D or B
Explanation:
Waves break by shorelines so height will decrease. I dont know about wave speed so i put two answers
As a water wave nears the coastline, the wave height increases and the wave speed decreases due to friction with the seafloor, a process called shoaling, which ultimately leads to the waves breaking on the shore.
As a water wave nears the coastline, its behavior changes due to the decreasing water depth. As the wave approaches shallow water, its wave speed decreases because it starts to feel the ocean bottom. When the depth becomes less than about half the wave's wavelength, the bottom part of the wave experiences friction and slows down, causing the wave to steepen. This is accompanied by a decrease in wavelength and an increase in wave height, a process known as shoaling. Eventually, this leads to the wave breaking when the wave steepness reaches a certain limit; commonly, this limit is when the wave height is one-seventh the wavelength.
Changing direction is an example of a kind of
A acceleration
B speed
C VelocIty
D constant rate
Answer:
Changing direction is an example of a kind of acceleration
Explanation:
Acceleration is the "change of velocity" of an object concerning time. Acceleration being vector quantities, thus an object’s acceleration is the produce of orientation of the net force that has been acted on the object.
Newton’s second law explains the magnitude of acceleration. An example is when a car travels in the straight line, it is accelerates in the direction of its travel. As the car turns the acceleration occurs in a new direction.
Changing direction refers to acceleration, because it's about the change in velocity, which includes both speed and direction. So, if the direction changes but speed remains the same, there is still acceleration.
Explanation:Changing direction is an example of a kind of acceleration. Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity.
This is seen when an object changes its speed, direction, or both. For example, if you are driving a car and make a turn, even if your speed remains constant, you're experiencing acceleration because your direction is changing. Therefore, changing direction is associated with acceleration, not speed, velocity, or a constant rate.
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PLEASE ANSWER BEFORE JAN 1, 2020!!!
Which of the following statements correctly describes meiosis?
A. The cells produced at the end of meiosis are genetically identical to the parent cell.
B. Meiosis does not occur in reproductive cells.
C. The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell.
D. Cells divide only once during meiosis.
Answer: option C - The cells produced at the end of meiosis contain half the number of chromosomes as the parent cell
Explanation:
Meiosis is also known as REDUCTIVE DIVISION, simply because a parent cell with diploid number of chromosome (46) is divided into four daughter cells with haploid number of chromosome (23)
Thus, ONLY option C correctly defines meiosis
At the end of meiosis, produced cells contain half the number of chromosomes as the parent cell. Option C is correct.
Meiosis:
It is division in which cell divide into 4 haploid daughter cells.
The daughter cells are haploid.Haploid means cell have half of number the chromosome of its parent.It is found in the germ cells to produce the sperm and ovum.Therefore, at the end of meiosis, produced cells contain half the number of chromosomes as the parent cell.
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The pattern of__ is visualized on X-ray film by autoradiography.
Answer:
The pattern of decay emission is visualized on X-ray film by auto-radiography.
Explanation:
The image on the x-ray are auto-radiography or the nuclear emission that has been produced as a result of the decay emission because of the gamma particles or the beta particles which comes from a radioactive substance. These auto-radiography are available as the digital image as a result of recent development of gas detectors or because of the rare earth phosphor imaging system. Some of the can be studied microscopically for silver granules this method is called as micro- auto-radiography.
Answer: the pattern of hybridization
Explanation:
did it
Can someone help!! I think it’s D but idk maybe B..
Answer:it’s d the answer is d
Explanation:
Answer:
Explanation:
I have never used this representation before, but I think first of all the figure has 7 Carbons at each joint and 1 carbon at each end. If you count from the left side, the methyl is attached to the second joint, which makes it 2-methylheptane.
D is correct, or at least I agree with you.
What if you drop a 30 kg object and a 10 kg object from a bridge at the same time which one will hit the water first
Answer:
Both of them will hit the water at the same time.
Explanation:
The time taken to hit the water is given by:
Let H be the height of the bridge.
[tex]H=ut+\frac{1}{2}gt^{2}\\\\Initial\:Velocity=u=0\\\\H=\frac{1}{2}gt^{2}\\\\t=\sqrt{2gH}[/tex]
The time taken to hit the water does not depend on the weight of the object.
It only depends on the height of the bridge.
Since, both the objects are dropped from the same bridge, they will hit the water at the same time.
Three different atoms or atomic cations with 4 electrons
Answer:
2 atoms leftb
Explanation:
Which of these gives a correct trend in ionization energy
Answer:
C. I, III , IV
Explanation:
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus.
Ionization energy increases across a period and decreases down a group on the periodic table due to changes in atomic radius and nuclear charge. Successive ionization energies for a single element also increase because it's harder to remove each successive electron. There is a significant leap in ionization energy when removing a core electron as opposed to a valence electron.
Explanation:The ionization energy of an element is the energy required to remove an electron from a neutral atom. Generally, the ionization energy increases across a period and decreases down a group on the periodic table. This is due to variations in atomic radius and nuclear charge. As you move across a period, atomic radius decreases, while nuclear charge increases, making the electrons more tightly bound to the nucleus, thus increasing ionization energy.
When it comes to successive ionization energies for a single element, it increases as it's harder to remove each successive electron. For instance, when you compare IE₁ for Al and IE₁ for Tl, you will find that IE₁(Tl) < IE₁(Al) because the 6p¹ electron from Tl is easier to remove than the 3p¹ electron from Al.
An important trend to remember is that ionization energy significantly increases when removing a core electron compared to a valence electron due to the greater attraction to the nucleus. As a result, the second ionization energy for sodium, for instance, which removes a core electron, is much higher than its first ionization energy which removes a valence electron.
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What subatomic particle does the atomic number identify?
Answer: proton
Explanation:
find the mass of sucrose (molecular mass=342) required to be dissolved per 600cm² solution to prepare a semi molar solution.
To prepare a 0.5 M sucrose solution with a volume of 600 cm³, you would need to dissolve 102.6 grams of sucrose.
Explanation:How to Calculate the Mass of Sucrose for a Semi Molar Solution
To prepare a semi molar solution, you first need to understand that "semi molar" implies a 0.5 molar concentration of the solute. Given that the molecular mass of sucrose is 342 g/mol, we can proceed with the calculations.
To prepare a 0.5 M solution, 0.5 moles of sucrose per liter of solution are needed. Since the density of a sucrose solution is not provided, we will assume the density of water for this example, which is 1 g/cm³, making 600 cm³ of solution equivalent to 600 mL or 0.6 L.
Now, we calculate the number of moles of sucrose required as follows:
Number of moles = Molarity × Volume in liters = 0.5 mol/L × 0.6 L = 0.3 moles of sucroseFinally, to find the mass of sucrose:
Mass of sucrose = Number of moles × Molar mass = 0.3 moles × 342 g/mol = 102.6 grams of sucroseTherefore, to prepare a semi molar (0.5 M) solution, you would need to dissolve 102.6 grams of sucrose in 600 cm³ of solution.
Final answer:
To make a 0.5 M sucrose solution with a volume of 600 cm³, 102.6 grams of sucrose, which has a molar mass of 342, must be dissolved.
Explanation:
The question is about finding the mass of sucrose needed to prepare a semi molar solution, assuming semi molar refers to 0.5 M (molar concentration). Since the molecular mass of sucrose is given as 342, to prepare 600 cm³ (which is equivalent to 0.6 L) of a 0.5 M solution, the number of moles needed will be 0.5 moles/L × 0.6 L = 0.3 moles of sucrose. To find the mass of sucrose, we will multiply the number of moles by the molar mass:
Mass of sucrose = Number of moles × Molar mass
= 0.3 moles × 342 g/mole
= 102.6 g
Therefore, to prepare the desired semi molar solution, 102.6 grams of sucrose should be dissolved in 600 cm³ of solution.
Which example best shows conservation of resources?
A. leaving the water running when brushing your teeth
B. using a disposable plastic bag every shopping trip
C. driving a gas-powered car when taking a short trip
D. recycling aluminum cans and glass bottles
Answer:
D.
Explanation:
I took this test as a freshman and this was the only question of 4 that I can remember
The example that best shows conservation of resources is recycling aluminum cans and glass bottles.
WHAT IS CONSERVATION?Conservation refers to the wise and judicious use of resources to make them available for future use.
Conservation of resources can include any way by which resources are not wasted or are utilized effectively.
One way in which conservation is achieved is recycling of use products. Therefore, the example that best shows conservation of resources is recycling aluminum cans and glass bottles.
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What is a "curie"?
A.standard charge of alpha particles
B.mass of one alpha particle
C.unit of radioactive disintegration
D.a unit of gamma radiation
Answer:
C
Explanation:
The curie specifies the amount of ionizing radiation energy that is emitted from an unstable isotope as it decays.
Answer:
Unit of radioactive disintegration
Explanation:
If the ratio of the length of a rectangle to its width is 3 to 2, what is the
length of a rectangle whose width is 4 inches?
The length of a rectangle with a width of 4 inches and a length-to-width ratio of 3:2 is 6 inches.
If the ratio of the length of a rectangle to its width is 3 to 2, and if the width of the rectangle is 4 inches, we can set up a proportion to find the length. Using the ratio 3:2, we can write 3/2 = L/4, where L is the length of the rectangle we want to find. By cross-multiplying, we get 3 * 4 = 2 * L, which simplifies to 12 = 2L. Dividing both sides by 2, we find that L = 6 inches.
So, the length of the rectangle is 6 inches.
consists of two or more different types of atoms bonded together. is a combination of different substances that can be separated by physical means. varies according to the amount of water present. has fixed definite proportions at all times. depends on the temperature.
Answer:
1. A molecule
2. A mixture
3. Concentration
4. Chemical formula
5. Kinetic energy
Explanation:
1. A molecule consists of two or more different types of atoms bonded together.
For this question, it's important to understand that we cannot be too abstract and use terms, such as compound. The reason is simple: molecules consist of atoms, and while molecules produce compounds, the latter can also be ionic. Ionic compounds would contain ions in them rather than atoms. In ionic compounds, electrons are transferred from one atom to the other to form cations and anions.
Molecules, on the other hand, consist of atoms. In fact, those atoms shouldn't necessarily be different: for example, we may have an oxygen gas molecule which consists of two oxygen atoms.
2. A mixture is a combination of different substances that can be separated by physical means.
Usually, mixtures are in the same physical state, for example, we may have a mixture of an aqueous layer, such as water, and an organic layer, such as hexane. In order to separate them, we might use a separation funnel, as water is polar and hexane is non-polar, they will form two separate layers. Collecting the bottom layer in a separate flask from the funnel and then the remaining layer will help us separate them based on their difference in polarity.
3. Many variables in chemistry depend on the amount of water present. Water is a solvent. One of the typical examples is concentration. Concentration, or molarity, is a ratio between the moles of a solute and the volume of a solution. Changing the amount of water would change the concentration of a solute as a result.
E. g., if we evaporate water, our solvent, from a specific solution, the concentration of a solute will increase, as we'll have the same amount of a solute in moles for a lower volume of a solution. Similarly, if we dilute the solution (increase the volume of it by adding more water), the volume will increase and we'll have the same amount in moles of the solute for a greater amount of the solution, so the concentration will decrease.
4. A chemical formula has fixed definite proportions at all times. Regardless of what mass of a compound we have, according to the law of definite proportions, atoms always combine in a fixed ratio in compounds. For example, we know that we would always have two hydrogen atoms and one oxygen atom in a water molecule regardless of what mass of water we have.
Similarly, if we remember ionic compounds, if we take sodium chloride, NaCl, the ionic ratio between sodium and chloride ions is always 1 : 1 (one sodium cation combined with one chloride anion). This is fundamentally true and it's independent of any quantity.
5. Similarly, this is an open question. A typical answer to this would be kinetic energy. Kinetic energy only depends on temperature of a substance. Kinetic energy is the energy of movement: the greater it is, the greater the velocity of an object.
The greater the temperature, the higher the kinetic energy. This direct proportionality is seen from the equation [tex]E_k = \frac{3}{2} kT[/tex], where k is a constant and T is the absolute temperature. Notice that for higher T values, the kinetic energy term is higher.
Thinking about it from the other perspective, density, as another example, also depends on temperature. The greater the temperature, the greater the distances between the molecules, so the density decreases with an increase in temperature.
There are many more thermodynamic examples to look at as well!
What percentage of the mass of 1 mole of CH3Cl is derived from carbon?
Answer:
Element Symbol Atomic weight Atoms Mass percent
Carbon C 12.0107 1 23.7894
Hydrogen H 1.00794 3 5.9892
Chlorine Cl 35.453 1 70.2213
Explanation:
Final answer:
The percentage of the mass of 1 mole of CH3Cl derived from carbon is 23.79%, which is calculated by dividing the molar mass of carbon by the total molar mass of CH3Cl and multiplying by 100.
Explanation:
To calculate what percentage of the mass of 1 mole of CH3Cl is derived from carbon, we first determine the molar mass of CH3Cl. The molar mass of carbon (C) is approximately 12.01 g/mol, hydrogen (H) is 1.01 g/mol, and for chlorine (Cl), it is approximately 35.45 g/mol. Thus, the molar mass of CH3Cl is calculated as:
Carbon: 12.01 g/mol
Hydrogen: 1.01 g/mol × 3 = 3.03 g/mol
Chlorine: 35.45 g/mol
Adding these together gives the total molar mass of CH3Cl as 50.49 g/mol. To find what percentage of this mass is due to carbon, we divide the mass of carbon by the total molar mass and multiply by 100:
Percentage of carbon = (12.01 / 50.49) × 100 = 23.79%
Therefore, carbon constitutes 23.79% of the mass of 1 mole of CH3Cl.
What is the difference in mass between 3.01×10^24 atoms of gold and a gold bar with the dimensions 6.00 cm X 4.25 cm X 2.00 cm
Answer:
The difference in mass between 3.01×10^24 atoms of gold and a gold bar with the dimensions 6.00 cm X 4.25 cm X 2.00 cm is :
Difference in mass = 985.32 - 984.5 = 0.82 g
Explanation:
Part I :
[tex]n =\frac{3.01\times 10^{24}}{6.022\times 10^{23}}[/tex]
n = 4.9983
n = 4.99 moles
(Note : You can also take n = 5 mole )
Molar mass of gold = 196.96 g/mole
This means, 1 mole of gold(Au) contain = 196.96 grams
So, 4.99 moles of gold contain = [tex]5\times 196.96[/tex] g
4.99 moles of gold contain = 984.8 g
Mass of [tex]{3.01\times 10^{24}}[/tex] atoms of gold = 984.5 g
Part II :
Density of Gold = [tex]19.32 g/cm^{3}[/tex]
Volume of the cuboid = [tex]length\times breadth\times height[/tex]
Volume of the gold bar =[tex]6.00\times 4.25\times 2.00[/tex]
Volume of the gold bar = 51[tex]cm^{3}[/tex]
Using formula,
[tex]Density = \frac{mass}{Volume}[/tex]
[tex]Mass = Density\times Volume[/tex]
[tex]Mass = 19.32 \times 51[/tex]
Mass = 985.32 g
So, A gold bar with the dimensions 6.00 cm X 4.25 cm X 2.00 cm has mass of 985.32 g
Difference in mass = 985.32 - 984.5 = 0.82 g