Answers
The energy value of olive oil is 42.37 kJ/g. The enthalpy from the olive oil is 52.198 kJ/mol.
The question isn't complete. A similar question is in the attachment. A calorimeter is a tool that use to measure heat energy according to the equation
Q = m × c × ΔT
m = mass of water in calorimeter = 390 gramsc = specific heat capacity (J/g °C)c for pure water = 4.184 J/g °CΔT = temperature change (°C)
T₁ = initial temperature = 22.7 °C
T₂ = final temperature = 37.5 °CΔT = T₂ - T₁
ΔT = T₂ - T₁ = 37.5 - 22.7 = 14.8 °CQ = heat energy (J)
The heat energy that release
Q = m × c × ΔT
Q = 390 × 4.184 × 14.8
Q = 24,150.048 J
Q = (24,150.048 ÷ 1,000) kJ
Q = 24.15 kJ
The energy value is the ratio between the heat energy and the mass. For this problem
Mass of olive oil = 0.57 gramsQ = 24.15 kJEnergy values = Q ÷ mass = 24.15 ÷ 0.57 = 42.37 kJ/gThe formula to calculate the enthalpy ΔH = Q ÷ n
n = number of moles Q = heat energy = 24.15 kJΔH = enthalpyOlive oil C₈₈H₁₆O₁₀C = 12 g/mol, H = 1 g/mol, and O = 16 g/mol
M = (88 × 12) + (16 × 1) + (10 × 16)
M = 1,056 + 16 + 160
M = 1,232 g/molAccording to Stoichiometry n = m ÷ M
m = 0.57 g
n = m ÷ M = 0.57 ÷ 1,232
n = 4.63 × 10⁻⁴ molThe enthalpy
ΔH = Q ÷ n
ΔH = 24.15 ÷ (4.63 × 10⁻⁴)
ΔH = 52.198 kJ/mol
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Related Questions
What is the empirical formula of phosphorus sulfide? A 43.6-mg sample of phosphorus reacts with sulfur to form 156 mg of the compound phosphorus sulfide.
Answers
The empirical formula of phosphorus sulfide is P[tex]_2[/tex]S[tex]_3[/tex]. The definition of an empirical formula for a compound is one that displays the ratio of the components present.
What is empirical formula?The definition of an empirical formula for a compound is one that displays the ratio of the components present in the complex but not the precise number of atoms in the molecule. Subscripts are used next to the component symbols to indicate the ratios.
the mass of S used = 156 mg-43.6mg= 79.4 grams
moles of phosphorous= 43.6/12= 3.717 moles
moles of sulfur (S) = 79.4/32= 2.48 moles
phosphorous= 3.717/2.48 = 1.5
sulfur = 2.48/2.48= 1
the empirical formula of phosphorus sulfide is P[tex]_2[/tex]S[tex]_3[/tex].
Therefore, the empirical formula of phosphorus sulfide is P[tex]_2[/tex]S[tex]_3[/tex].
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2.13 pm to meters
Express your answer to three significant figures and include the appropriate units.
The value should be entered as a single number or in scientific notation.
Answers
2.13 pm in metre is 2.13 × 10⁻¹²m. Unit conversion is a multi-step procedure that involves adding, subtracting, multiplying, or dividing.
What is unit conversion?Unit conversion is a multi-step procedure that involves adding, subtracting, multiplying, or dividing by a conversion factor. Additionally, rounding and choosing the appropriate number of important digits may be necessary during the procedure. To measure various characteristics, several units of conversion were utilized.
To better comprehend, we convert measurement units in mathematics. For ease of understanding, the height of a tabletop is in inches, but the width of a garden was measured in yards.
2.13 pm to meters
1pm = 10⁻¹²m
2.13 pm × 10⁻¹²m= 2.13 × 10⁻¹²m
Therefore, 2.13 pm in metre is 2.13 × 10⁻¹²m.
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Course Activity: Oxidizing and Reducing Chemicals (CHEMISTRY EDMENTUM)
TASK 2 PART C:
-Compare the mass of the zinc strip from test tube 5 with the mass of the same strip measured in task 1, part A. Based on your observations of the metal strip, explain what factors may have added to its mass or caused a decrease in its mass. Which had the greater effect? Explain your reasoning.
PLEASEE GIVE A GOOD RESPONSE I'M SO LOST
Answers
The electrolytic reaction between Zn and Ag results in the oxidation of Zn and reduction silver metal. The oxidation of Zn make the Zn ions pass into the solution and its mass decreases.
What is electrochemical reaction ?An electrochemical cell converts chemical energy to electrical energy. It involves redox reaction of two metallic electrodes. The electrode with higher negative electrode potential undergo oxidation and one with lower negative or having positive potential undergoes reduction.
The electrode which undergo oxidation is consumed in the process and metal gets ionized. Ions move into the electrolyte. Whereas, the ions of the second electrode gets reduced into metallic state and deposits on the electrode.
In this case, Zn is oxidizing and it is consumed to reduce the silver metal on the cathode. Therefore, the mass of Zn metal decreases in the strip.
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AcPect Chemistry Deta Chemistry is a science of substanc about their properties, structures, and thei comfests mas matter { occupies space (Volume) Branches of Chemistry L organic incudes hydro Carbon (C&H ссян In arganic Chemisitvy: they excRollt Physical Chemsitry
Answers
In order to provide for our basic needs of food, clothing, shelter, health, energy, and pure air, water, and soil, chemistry is crucial.
What is chemistry in one word?Chemistry is the field of study that focuses on the physical and chemical characteristics of different types of matter as well as their composition.Organic chemistry is the study of molecules that include carbon. Inorganic chemistry: Inorganic chemistry is concerned with substances like metals and minerals. Physical chemistry: Physics and chemistry are combined in physical chemistry. Biochemistry is the study of the chemical processes that take place within living organisms.In order to provide for our basic needs of food, clothing, shelter, health, energy, and pure air, water, and soil, chemistry is crucial. Chemical technologies improve our quality of life in many ways by offering fresh approaches to issues with health, materials, and energy use.To learn more about chemistry refer to:
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helpppppppPPPPPP>>>>>>>>>>>>>>!!!!!!!!!!!!!
Answers
Rocks undergo weathering or erosion by water , air or an y mechanical factors. This will decompose the rock to small size and over time the changes to grains.
What is rock weathering ?Decomposition of rocks into smaller rocks and grains is called weathering or erosion. The weathering process is of two types. Chemical weathering and physical weathering.
In chemical weathering, rocks undergo decomposition by the action of water or air. In physical weathering, a rocks breakes by a pressure. In both cases, over long time bigger rocks will change to small rock and grains.
In the given case, the rock changed in shape by decrease the sharpness of its edge. It size reduced by 1mm by one year. However, the hardness or color didn't change.
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Intermolecular attractions that form between nonpolar substances in water are called__________
interactions.
Answers
Intermolecular attractions that form between nonpolar substances in water are called Hydrophobic interactions.
What do you mean by Intermolecular attraction?Intermolecular attraction refers to the attractive forces between molecules. These forces determine many of the physical properties of a substance, such as its boiling and melting points, surface tension, and viscosity. There are several types of intermolecular attractions, including hydrogen bonding, dipole-dipole interactions, and London dispersion forces.
Hydrogen bonding occurs between molecules that contain hydrogen and electronegative elements such as nitrogen, oxygen, and fluorine. Dipole-dipole interactions occur between polar molecules, where one end is positively charged and the other end is negatively charged. London dispersion forces are the result of temporary dipoles that form in nonpolar molecules and attract each other.
Intermolecular attraction plays a crucial role in the behavior of liquids and solids, and it helps to explain the properties of substances such as why some substances are liquids at room temperature, while others are solids. The strength of intermolecular attractions can be influenced by temperature, pressure, and other environmental factors, which can have a significant impact on the physical properties of a substance.
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The electrons are arranged in two different energy levels. There are _____ in the first energy level and _____ in the second energy level.
Answers
The second floor may hold a maximum of eight electrons with two in the s orbital and 6 each of the triple p orbitals. Five d orbitals are grouped together for each principal level of energy above the second.
Are there several sorts of energy?Despite the numerous different kinds of energy, kinetic and potential energy are the two main categories. Energy is the force that propels moving mass or objects. Examples include electrical and mechanical energy, among others.
What are the two energy types and what example best illustrates each?Potential or kinetic energy are the two types of energy. Chemical, electric, gravitational, mechanical, and radioactive forms of potential energy can all be stored. Work is being done by kinetic energy forms like heat, lighting, motion, and sound.
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An electron is confined in a potential well of 1 Å width.
What is the energy difference between the third and first energy states?
Answers
The energy difference between the third and first energy states of an electron confined in a potential well of 1 Å width depends on various factors such as the depth of the potential well and the mass of the electron.
What is known as energy states?Energy states refers to any discrete value from a set of values of total energy for a subatomic particle confined by a force to a limited space or for a system of such particles, such as an atom or a nucleus.
The excitation energy stored in excited atoms and nuclei is radiated usually as visible light from atoms and as gamma radiation from nuclei as they return to their ground states.
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Rikki has a sample of water but he is not sure if it is pure or not. He heats the water until it begins to boil. He records the temperature which is 103°C. Is this water pure?
Answers
The sample of water is impure because the boiling point is above 100°C.
What is boiling point?Boiling point is the temperature at which a liquid boils, with the vapor pressure equal to the given external pressure.
The boiling point of pure water is 100 °C or 212 °F at 1 atmosphere of pressure (sea level).
The boiling point of water also depends on the purity of the water. Water that contains impurities (such as salted water) boils at a higher temperature than pure water. This phenomenon is called boiling point elevation.
According to this question, a sample of water boils at 103°C, hence, the water is impure.
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I need to the Average Density and show calculations.
Answers
The average density is 0.954 g/ mL
The mean or average density is the total mass of a region divided by the entire volume of that region. Calculating the average density of a mixture involves multiplying the densities of each compound by its volume, then dividing the result by the sum of all the volumes.
The mass of the object divided by its volume is referred to as the average or "mean" density. For mass, we'll use grams (g), and for volume, we'll use cubic centimeters (cm³).
The average density can be calculate as follows:Average density = density ₁ +density ₂
number of density
Average density = 0.954 g/ml +0.954 g/ml
2
Average density = 0.954 g/mL
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All "terminally differentiated" organs are immune to cancer
True or False
Answers
Answer:
false
Explanation:
How many moles of atoms are in each elemental sample?
(a) 4.6 X 1024 Pb atoms
(b) 2.87 × 10- He atoms
(c) 7.91 × 102 K atoms
(d) 4.41 × 10- Ca atoms
Answers
(a) For 4.6 x 10^24 Pb atoms, the number of moles is: 4.6 x 10^24 Pb atoms / 6.022 x 10^23 atoms/mol = 0.764 mol Pb
(b) For 2.87 x 10^-2 He atoms, the number of moles is: 2.87 x 10^-2 He atoms / 6.022 x 10^23 atoms/mol = 4.77 x 10^-26 mol He
(c) For 7.91 x 10^2 K atoms, the number of moles is: 7.91 x 10^2 K atoms / 6.022 x 10^23 atoms/mol = 1.31 x 10^-21 mol K
(d) For 4.41 x 10^-2 Ca atoms, the number of moles is: 4.41 x 10^-2 Ca atoms / 6.022 x 10^23 atoms/mol = 7.30 x 10^-26 mol Ca
Now, inspect the properties of the unknown elements, compare them to the properties of your known elements, and see where the unknown elements best fit in the table above. Once you’re done, use your periodic table to identify each unknown element below.
Answers
Based on the comparison between the properties of the unknown elements and those of known elements, the elements are alkali metals.
The unknown elements are sodium and potassium.
What are the properties of alkali metals?Alkali metals exhibit metal properties such as strong thermal and electrical conductivity, luster, ductility, and malleability. In the outermost shell of each atom of an alkali metal, there is just one electron. Compared to those in inner shells, this valence electron is significantly more loosely bonded.
Other properties of the alkali earth metals are:
Stored in a mineral oil solution.Low melting points.Low densitiesLow electronegativity.Low ionization energy.Learn more about alkali metals at: https://brainly.com/question/30391109
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Helium gas diffuses twice as fast as gas X.Calculate the relative molecular mass and relative density of gas X ? (He=4)
Answers
The vapor density of the gas X is 8.
How does a gas diffuse?
A gas diffuses by the random movement of its particles. In a container of gas, the individual gas particles are constantly moving in random directions and colliding with each other and the walls of the container. This random motion causes the particles to spread out evenly, leading to diffusion.
From the Graham's law; we have that;
R1/R2 = √M2/M1
2/1 = √M2/4
4/1 = M2/4
16 = M2
The vapor density of the gas X is 0.5 * 16 = 8
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CAN SOMEONE HELP WITH THIS QUESTION BELOW?✨
If a plot of weight (in g) vs. volume (in mL) for a metal gave the equation y=15.28x and R^2=0.9981, what is the density of the metal?
Answers
Answer:- density = 13.41 g/ml
Density (d) of a substance is the mass (m) occupied by it in a given volume (v).
Density mass/volume =
i.e. d = m/v
m = (d) v -----(1)
The given equation from the plot of weight vs volume is :
y = 13.41 x ---- (2)
Based on equations (1) and (2) we can deduce that the density of the metal is 13.41 g/ml
How many moles of Cu are found in 9.49x10^21 atoms Cu?
Answers
9.49 x 10^21 atoms of Cu is equivalent to 1.58 x 10^-2 moles of Cu.
To convert the number of atoms of copper (Cu) to moles, we need to use Avogadro's number. Avogadro's number is defined as the number of atoms, ions, or molecules in one mole of a substance. It is equal to 6.022 x 10^23.
The number of moles of Cu can be calculated as follows:
9.49 x 10^21 atoms / (6.022 x 10^23 atoms/mol) = 9.49 x 10^21 / 6.022 x 10^23 mol = 1.58 x 10^-2 mol
What’s the equipment shown below caused?
Answers
The diagram that have been shown represents an electrochemical cell.
What is a cell or battery?A cell is a basic unit of an electrical system that generates electricity from a chemical reaction. It typically consists of two electrodes (anode and cathode) immersed in an electrolyte solution, which allows for the flow of ions between the electrodes.
A battery is a group of cells connected together to provide a more powerful and longer-lasting source of electrical energy. A battery can consist of one or more cells, depending on the required voltage and current output. Batteries are commonly used in portable electronic devices, automobiles, and backup power systems.
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Identify the scenarios below as to whether they would increase or decrease the resistance of an electric current though a body.
Answers
Answer: Increase Resistance- lenght of conductor, Decrease resistance- Utilize a conductor with a larger cross-section, Decrease Resistance- Cool the conductor to lower its temperature
Explanation:
The resistance of an electric current can increase or decrease depending on the material it's passing through, the length of its path, its cross-sectional area, and the temperature. Lower resistances are found in metals like copper or aluminum, or in paths with a larger cross-sectional area. Higher resistances are found in materials like rubber or glass, in longer paths, or at higher temperatures.
Explanation:There are several factors that can increase or decrease the resistance of an electric current passing through a body. These could include:
Material: Different materials have different resistances. For instance, metals like copper or aluminum have low resistance, while materials such as rubber or glass have high resistance.Length: The longer the path through which the current has to flow, the more resistance there will be.Cross-sectional area: A larger cross-sectional area will offer less resistance as there are more paths for the current to take.Temperature: Generally, the resistance of a material increases as its temperature increases.Learn more about Electric Current Resistance here:https://brainly.com/question/20382684
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the total pressure of gas collected over water is 650 mmHg and the temperature is 19.5c what is the pressure of hydrogen gas formed in mmHg?
Answers
The pressure of hydrogen gas formed in mmHg is 633.5mmHg.
About Pressure
In physics, pressure is the magnitude of the force acting per unit area of surface or area of pressure. This phenomenon arises as a result of the compressive force acting on an object per unit surface area in a perpendicular direction.
A pressure will depend on the magnitude of the force. The amount of pressure generated is in line with the amount of force exerted or directly proportional to the force. On the one hand, pressure is inversely proportional to surface area. If the surface area of the compressive field is enlarged, then the pressure will decrease.
The international unit of pressure is Newton per meter squared or N/m2. Meanwhile, the amount of pressure is symbolized by the letter P or p. Besides N/m2, pressure has another unit of measurement, namely Pascal (Pa), which is taken from the name of the French physicist, Blaise Pascal.
Based on question above, the calculation is:
Pressure of hydrogen gas = total pressure - vapor pressure of water
Vapor pressure of water at 19°C = 16.5 mmHg
Hydrogen gas pressure = 650.0mmHg to 16.5mmHg = 633.5mmHg
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please due friday but want to do today
Answers
Answer: 3.44%
Explanation: try it for math
balance the equation NaHCO3+H3C6H5O7=CO2+H2O+NA2C6H5O7
Answers
Answer:
The balanced chemical equation for the reaction between sodium bicarbonate (NaHCO3) and citric acid (H3C6H5O7) is:
NaHCO3 + H3C6H5O7 -> CO2 + H2O + Na2C6H5O7
Explanation:
In this reaction, sodium bicarbonate and citric acid react to form carbon dioxide (CO2), water (H2O), and sodium citrate (Na2C6H5O7). The coefficients in front of each substance indicate the relative number of moles of that substance involved in the reaction. In this case, the coefficients are already balanced, meaning that there are equal numbers of atoms of each element on both sides of the equation.
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Which phrases apply to metamorphic rock formation? Check all that apply.
form from existing rocks
form without melting
appear foliated or non-foliated
form from liquid rock
form from deposition
require heat and pressure to form
Answers
Metamorphic rock formation involves the transformation of existing rocks under heat and pressure. They form without melting and can appear foliated or non-foliated.
Explanation:Metamorphic rocks are formed from the transformation of existing rock types in a process called metamorphism, which means 'change in form'. The appropriate phrases that describe metamorphic rock formation are: 'form from existing rocks', 'form without melting', 'appear foliated or non-foliated', and 'require heat and pressure to form'. These rocks are subject to conditions of heat and pressure that cause them to change physically and/or chemically, resulting in a new type of rock. They can either be foliated (layered) or non-foliated. Importantly, metamorphic rock formation does not include a liquid state, meaning they do not 'form from liquid rock' or 'form from deposition'.
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The 1987 Nobel Prize in Physics was awarded to J. G. Bednorz and K. A. Müller for their discovery of superconducting ceramic materials such as
YBa₂Cu3O7. The figure here shows the unit cell of another yttrium-barium-copper oxide.
Answers
The molecular formula for the compound is YBa2Cu3O8
The number of atoms per unit cell is calculated by using the following formula:
The number of atoms per unit cell× its contribution
Thus, the number of oxygen atoms is calculated= 8
Therefore, the molecular formula for the compound is YBa2Cu3O8.
What is a molecular formula?
A chemical formula is a way of presenting information about the chemical ratios of atoms that make up a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes other symbols such as parentheses, dashes, parentheses, commas, and plus and minus signs.To know more about molecular formula, click the link given below:
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Balance the chemical equation below
Na HCO3 + H 3 C 6 H 5 07 → CO₂ + +H₂0 + Na ₂ C6 H ₂ O 7
Answers
The skeletal equation is:
NaHCO3
Na2CO3 + H2O + CO2 • To equalize sodium, multiply NaHCO3 by 2 2NaHCO3 - Na2CO3 + H2O + CO2
The equation is balanced.
Do you guys know the balancing Au(s) + KNO3 ->
Answers
Strong oxidizer potassium nitrate, or KNO3, is a crystal salt that is employed in fertilizer, medicine, and the production of gunpowder. The artificial nitrates salt of potassium is called potassium nitrate.
K in terms of coefficient:The K factor, also known as the viral coefficient, calculates how many additional users a single new user contributes to your lifetime total. If a SaaS company's software is good, its customers will recommend it to other friends, teams, and businesses.
KNO3 is endothermic, why?Because more energy is needed to separate the potassium potassium ions or nitrate anions from one another in solids than is released whenever these ions are hydrated, this occurs. It is therefore an endothermic process.
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suggest an explanation of why the concentration of the sulfuric acid increases.
Answers
Hydrogen is formed at the negative electrode (cathode) and oxygen at the positive electrode (anode) and the concentration of sulfuric acid increases.
What is Electrolysis?Direct electric current is used in the electrolysis process to accelerate chemical reactions that would not naturally occur.
It can be seen that as the electrolysis proceeds the dilute sulfuric acid gets slightly more concentrated as only water is removed from the electrolyte as hydrogen and oxygen.
The ions present in the dilute acid are H+(aq), OH–(aq) and SO4 2–(aq).
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suggest an explanation of why the concentration of the sulfuric acid increases during electrolyis
9. What is the density of a cube where all side measures 4cm
and the mass is 464g?
10
is
Answers
dsfsfsfdzfsdfsf
Explanation:
When 2 moles of ammonia (NH₃) decomposes into nitrogen gas (N₂) and hydrogen gas (H₂), how many moles of hydrogen gas are produced?
Answers
Answer:
When 2 moles of ammonia (NH3) decomposes into nitrogen gas (N2) and hydrogen gas (H2), the balanced chemical equation for the reaction is:
2 NH3 -> N2 + 3 H2
Therefore, 3 moles of hydrogen gas (H2) are produced for every 2 moles of ammonia (NH3) that decomposes.
Calculate the number of degree of freedom for a system made up of Ice and water at equilibrium. (A) 0 (B) 1 (C) 2 (D) 3
Answers
The number of degrees of freedom for a system made up of ice and water at equilibrium is 1.
The correct option is B.
What are thermodynamic degrees of freedom?A molecule's degree of freedom is how many different ways it can move, rotate, or vibrate in space when it is in the gas phase. There are three different kinds of degrees of freedom: translational, rotational, and vibrational.
The Gibbs phase rule states that F = C − P + 2.
where
F is the degree of freedom
C is the component
P is the phase involved
As a result, there are two degrees of freedom for a one-component, one-phase system, and any temperature and pressure are achievable within certain bounds.
From the phase rule formula:
F = C - P + 2
C is water = 1
P is liquid water and ice = 2
Hence,
F = 1 - 2 + 2
F = 1
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If gold has a density of 19.3 g/cm³ what is the mass of a cube of gold 12.00 cm on a side?
A 3.33 x 10^3 grams
B 3.34 x 10^4 grams
C 2.31 x 10^-2 grams
D 2.32 x 10^2 grams
Answers
The mass of the gold is 3.34 x 10^4 grams.
What is density?Density is a measure of mass per unit volume of a substance or object. It is expressed in units such as kilograms per cubic meter (kg/m^3) or grams per cubic centimeter (g/cm^3).
We have the following from the question;
Length of the side of the cube = 12.00 cm
Density of the gold = 19.3 g/cm³
Volume of the gold = l^3 = (12)^3 = 1728cm^3
Mass of the gold = Volume * density of the gold
= 1728cm^3 * 19.3 g/cm³
= 3.34 x 10^4 grams
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