According to the information we can infer that the amount of mcg of conjugated estrogen the patient would take in 30 days would be 37,500 mcg.
How many mcg of conjugated estrogen would the patient take in 30 days?The patient is prescribed Premarin, which contains 1.25 mg of conjugated estrogen per day. The prescription is to be taken for 60 days.
To calculate the total amount of conjugated estrogen taken in 30 days, we can use the following calculation:
Conjugated estrogen per day: 1.25 mgConjugated estrogen per 30 days: 1.25 mg/day x 30 days = 37.5 mgSince 1 mg is equivalent to 1,000 mcg, we can convert the total amount from milligrams to micrograms:
37.5 mg x 1,000 mcg/mg = 37,500 mcgAccording to the information we can conclude the patient would take 37,500 mcg of conjugated estrogen in 30 days.
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2.000 grams of Tantalum (Ta) is allowed to combust inside a bomb calorimeter in an excess of O2. The temperature inside changes from 32.00 °C to 39.15 °C.
If the calorimeter constant is 1160 J/°C, what is the energy of formation of Ta2O5 in kJ/mol? (remember, it could be positive or negative).
You will first need to write the balanced chemical equation for the formation of Ta2O5 . Tantalum is stable in the solid state at 25 °C and 1.00 atm of pressure.
The energy of formation of [tex]Ta_2O_5[/tex] is -1198.47 kJ/mol.
2 Ta + 5 [tex]O_2[/tex] → 2 [tex]Ta_2O_5[/tex]
1. Write the balanced chemical equation for the formation of [tex]Ta_2O_5[/tex]:
2 Ta + 5 [tex]O_2[/tex] → 2 [tex]Ta_2O_5[/tex]
2. Calculate the change in temperature (ΔT):
ΔT = final temperature - initial temperature
ΔT = 39.15 °C - 32.00 °C
ΔT = 7.15 °C
3. Convert the mass of Tantalum (Ta) to moles:
The molar mass of Tantalum (Ta) is 180.95 g/mol.
Moles of Ta = mass of Ta / molar mass of Ta
Moles of Ta = 2.000 g / 180.95 g/mol
Moles of Ta = 0.0110 mol
4. Calculate the energy change (ΔE) using the formula:
ΔE = q - CΔT
Where q is the heat absorbed or released, C is the calorimeter constant, and ΔT is the change in temperature.
5. Substitute the values into the formula:
ΔE = q - CΔT
ΔE = q - (1160 J/°C)(7.15 °C)
ΔE = q - 8294 J
6. The heat absorbed or released (q) can be calculated using the equation:
q = n × ΔH
Where n is the number of moles and ΔH is the molar enthalpy of the reaction.
7. Rearrange the equation to solve for ΔH:
ΔH = q / n
8. Convert the energy change (ΔE) to kilojoules:
1 kJ = 1000 J
ΔE = ΔE / 1000
9. Substitute the values into the equation:
ΔH = ΔE / n
ΔH = (-8294 J) / 0.0110 mol
ΔH = -753,090 J/mol
10. Convert the enthalpy change (ΔH) to kilojoules per mole:
ΔH = ΔH / 1000
ΔH = -753.09 kJ/mol
11. Since the stoichiometry of the balanced equation is 2:1, divide the enthalpy change by 2:
ΔH = -753.09 kJ/mol / 2
ΔH = -376.55 kJ/mol
12. The energy of formation of [tex]Ta_2O_5[/tex] is the negative of the enthalpy change:
Energy of formation = -ΔH
Energy of formation = -(-376.55 kJ/mol)
Energy of formation = 376.55 kJ/mol
13. Finally, round the answer to the appropriate number of significant figures:
Energy of formation of [tex]Ta_2O_5[/tex] = -1198.47 kJ/mol
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Given the molecular formula (C10H13OCI) and the H-NMR spectra below, determine the molecular structure and assign the peaks (a,b,c, etc).
The molecular formula (C₁₀H₁₃OCI) suggests that the compound is an organic compound with an ester functional group, an oxygen atom, and chlorine atom.
What are the peaks?The H-NMR spectra shows 7 peaks, which can be assigned to the following protons:
Peak a: This peak is at 18.0 ppm and is a triplet. It is assigned to the three methoxy protons (OCH₃) on the ester carbon.
Peak b: This peak is at 17.0 ppm and is a triplet. It is assigned to the two chlorine protons (Cl).
Peak c: This peak is at 16.0 ppm and is a singlet. It is assigned to the carbonyl proton (C=O).
Peak d: This peak is at 15.0 ppm and is a singlet. It is assigned to the aromatic proton (ArH) on the benzene ring.
Peak e: This peak is at 14.0 ppm and is a singlet. It is assigned to the aromatic proton (ArH) on the benzene ring.
Peak f: This peak is at 13.0 ppm and is a singlet. It is assigned to the aromatic proton (ArH) on the benzene ring.
Peak g: This peak is at 12.0 ppm and is a singlet. It is assigned to the aromatic proton (ArH) on the benzene ring.
The molecular structure of the compound can be determined by looking at the chemical shifts of the protons. The methoxy protons (a) have a chemical shift of 18.0 ppm, which is typical for methoxy protons on an ester carbon. The chlorine protons (b) have a chemical shift of 17.0 ppm, which is typical for chlorine protons. The carbonyl proton (c) has a chemical shift of 16.0 ppm, which is typical for carbonyl protons. The aromatic protons (d, e, f, g) have chemical shifts of 15.0 ppm, 14.0 ppm, 13.0 ppm, and 12.0 ppm, which are typical for aromatic protons on a benzene ring.
Based on the chemical shifts of the protons, the molecular structure of the compound is shown below:
O=C(OC(CH₃)₂)CH₂Cl
This compound is an ethyl octyl carbonate with a chloromethyl group attached to the ester carbon. The ethyl octyl carbonate is a relatively stable compound and is used in a variety of industrial applications.
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How do you balance
Ca(OH2) aq + H3PO4
In a neutralization equation?
Answer:
To balance this equation, we need two phosphate ions and three calcium ions. We end up with six water molecules to balance the equation: 2 H 3 PO 4 (aq) + 3 Ca (OH) 2 (aq) → 6 H 2 O (ℓ) + Ca 3 (PO 4) 2 (s) This chemical equation is now balanced.
Explanation:
Heat capacity of liquid water 4.18J/(g•k) Energy transferred?
The energy required to heat 1.00 g of water from 26.5°C to 83.7°C is 230 J. The energy formula for heating is, Energy = mcΔT.
Energy = mass × specific heat capacity × temperature change
Substituting the given values into the equation, we have:
Energy = 1.00 g × 4.18 J/(g·°C) × (83.7°C - 26.5°C) = 230 J
Therefore, the energy required is 230 J.
In this case, we are given the mass of water as 1.00 g and the specific heat capacity of water as 4.18 J/(g·°C).
The temperature change is 83.7°C - 26.5°C. By substituting these values into the equation, we find that the energy required is 230 J. This means that to heat 1.00 g of water from 26.5°C to 83.7°C, 230 J of energy must be supplied. The specific heat capacity is the amount of energy which is needed to increase the temperature of 1g of a substance by 1°C and in this case, it is 4.18 J/(g·°C) for water.
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Complete question:
The specific heat capacity of liquid water is 4.18 J/(g.k). How would you calculate the quantity of energy required to heat 1.00 g of water from 26.5 C to 83.7 C?
PLEASE HELP QUICKLY!!!
HI gas is removed from the system
at equilibrium below. How does the
system adjust to reestablish
equilibrium?
51.8 kJ + H₂(g) + 1₂(g) = 2HI(g)
A. The reaction shifts to the right (products) and the concentrations
of I, and H₂ decrease.
B. The reaction shifts to the left (reactants) and the concentrations
of H₂ and I increase.
C. The reaction shifts to the right (products) and the concentrations
of I, and H₂ increase.
D. The reaction shifts to the left (reactants) and the concentration of
HI increases.
Answer:
A. The reaction shifts to the right (products) and the concentrations of I and H₂ decrease.
Explanation:
If gas is removed from the system at equilibrium, the system will try to compensate for the loss by shifting the reaction in a direction that produces more gas molecules. This is known as Le Chatelier's principle, which states that a system at equilibrium will respond to a disturbance by shifting in a way that minimizes the effect of the disturbance.
In this case, since gas is being removed from the system, the reaction will shift to the side that produces more gas molecules. Looking at the balanced equation, we can see that 2HI(g) has a greater number of gas molecules compared to H₂(g) and I₂(g). Therefore, the system will shift to the right (products) to produce more HI(g) and reestablish equilibrium.
What explains why hydrolysis of a phosphate group from ATP to form ADP and Pi releases 30.5 kj/mol free energy?
The hydrolysis of a phosphate group from adenosine triphosphate (ATP) to form adenosine diphosphate (ADP) and inorganic phosphate (Pi) releases free energy due to the inherent chemical properties of ATP and the stability of the products formed.
ATP is a high-energy molecule that stores energy in its phosphate bonds. It consists of three phosphate groups, ribose sugar, and the adenine base. The terminal phosphate group in ATP is attached to the rest of the molecule by a high-energy bond known as a phosphoanhydride bond.
During hydrolysis, water molecules are used to break this phosphoanhydride bond, resulting in the removal of one phosphate group and the formation of ADP and Pi. This process is catalyzed by enzymes known as ATPases.
The hydrolysis of ATP to ADP and Pi is an exergonic reaction, meaning it releases energy. This energy release occurs because the products, ADP and Pi, are more stable than ATP. Breaking this repulsion and forming ADP and Pi releases energy. The release of free energy during the hydrolysis of a phosphate group from ATP to form ADP and Pi is a result of the instability of the high-energy phosphoanhydride bond in ATP and the increased stability of the products formed.
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A scientist is testing the effectiveness of Drug X on cancer. She gives a small amount of the drug to mice that have cancer. She gives each mouse a different amount from 1 to 10 grams, and then measures the size of the tumor in each mouse before the drugs and two weeks after the drugs. She gives one of the mice sugar instead of Drug X. What is her control in this experiment?
A. The size of the tumor before Drug X.
B. The amount of Drug X given to the mice.
C. The mouse that received sugar instead of Drug X.
D. The size of the tumor after Drug X
The control in this experiment is option C: the mouse that received sugar instead of Drug X. Option C
In scientific experiments, a control group is essential to establish a baseline for comparison. The control group helps determine whether the observed effects are due to the experimental treatment (in this case, Drug X) or other factors.
In this scenario, the scientist is testing the effectiveness of Drug X on cancer. To assess the impact of the drug, she administers different amounts of Drug X to mice with cancer. However, to properly evaluate the effects of Drug X, it is crucial to have a comparison group that does not receive the drug.
This allows the scientist to differentiate the effects caused specifically by Drug X from the natural progression of the tumor or other variables.
By giving one of the mice sugar instead of Drug X, the scientist establishes a control group. This mouse serves as a reference point to compare the tumor size changes in mice that received different amounts of Drug X. By comparing the tumor size changes in the mice receiving Drug X to the control mouse that received sugar, the scientist can attribute any differences observed to the effects of Drug X.
Therefore, in this experiment, the control is the mouse that received sugar instead of Drug X. The other options (A, B, and D) are all important aspects of the experiment but do not serve as the control group.
Option C
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A runner wants to run 12.8 km . She knows that her running pace is 6.5 mi/h . Part A How many minutes must she run?
answer and explanation :)
Calculate the wavelength of the line in the emission line spectrum of hydrogen caused by the transition of the electron from an orbital with =n8 to an orbital with =n1. Round your answer to 3 significant digits. in nm
Answer:
The wavelength of the emission line caused by the electron transition from n=8 to n=1 in hydrogen is 1320 nm, rounded to 3 significant figures.
Explanation:
Here are the steps to solve this problem:
1) We are given that the electron is transitioning from an orbital n=8 to n=1 in the emission spectrum of hydrogen.
2) According to the Rydberg formula for hydrogen, the wavelength of an emission line is given by:
λ = 1240/ (1/n^2_f - 1/n^2_i) nm
Where:
n_f is the final orbital (1 in this case)
n_i is the initial orbital (8 in this case)
3) Plugging in the values n_f = 1 and n_i = 8 into the Rydberg formula, we get:
λ = 1240/ (1/1^2 - 1/8^2)
= 1240/(1 - 0.0625)
= 1240/0.9375
= 1324 nm
4) Rounding this to 3 significant figures gives:
1320 nm
So the final answer is:
1320 nm
HELP! What do I do? It asked me to read the temp but I don't know what to do.
We can deduce here that the data appear to be linear.
What is linear data?Linear data refers to a type of data that follows a linear relationship or exhibits a linear pattern. In the context of data analysis and statistics, linear data refers to a set of data points that can be approximated or modeled by a straight line when plotted on a graph.
When data is considered linear, it means that there is a consistent and proportional relationship between the independent variable (x-axis) and the dependent variable (y-axis). In other words, as the independent variable changes, the dependent variable changes in a constant and predictable manner.
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if 500 mL of Ag+ solution contain 1.0 mols of Ag+, what is the molarity of the solution
If 500 mL of Ag+ solution contain 1.0 mols of Ag+, what is the molarity of the solution
To calculate the molarity of the solution, we need to use the formula
Molarity = moles of solute / volume of solution in liters
We are given that the volume of the solution is 500 mL, which is the same as 0.5 L. We are also given that the solution contains 1.0 mole of Ag+.
Substituting these values into the formula, we get:
Molarity = 1.0 mol / 0.5 L = 2.0 M
Therefore, the molarity of the solution is 2.0 M.
Using the molarity formula, where molarity is equal to number of moles divided by volume(in liters) of the mixture is 2 mol/L.
Here, it is given that 500 mL of the Ag+ solution contains 1.0 mole of Ag+. To find molarity, the volume must first be converted to liters.
Solution volume = 500 mL = 500/1000 = 0.5 L
The molarity (M) can then be calculated using the following formula:
Molarity (M) equals moles of solute divided by the volume of solution (in liters).
Molarity = 1.0 mol / 0.5 L = 2.0 mol/L
As a result, the Ag+ solution has a molarity of 2.0 mol/L.
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1.50 moles of N2 at 825 mmHg and 303 K are contained in a 34.3 L bottle. What is the pressure of the system if an additional 1.00 mole of gas is added to the bottle and the temperature is reduced to 273 K?
Answer:
1240.8964 mmHg
Explanation:
I believe you only need to use [tex]PV = nRT[/tex] for this problem.
P = Pressure in mmHg
V = Volume in Liters
n = Number of Moles
R = Gas Constant in mmHg/1mol
T = Temperature in Kelvin
Since you start with 1.50 moles of N2 and add an additional mole of N2, you will have 2.50 moles of N2.
Assuming that the volume of the bottle does not change,
P(34.3) = (2.5)(62.363)(273)
Note that 62.363mmHg/1mol is the gas constant R.
P = ((2.5)(62.363)(273))/(34.3) = 1240.8964 mmHg (approximately)
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A chemist adds 90.0 mL of a 1.6 x 10^-4 mM magnesium fluoride (MgF2) solution to a reaction flask. calculate the mass in micrograms of magnesium fluoride the chemist has added to the flask.
The mass of the compound in micrograms is obtained as 892 μg.
What is concentration?Chemistry's basic idea of concentration is crucial for characterizing and calculating the concentration of a chemical inside a mixture. It is essential to many practical and scientific processes, including as chemical reactions, pharmaceutical formulations, environmental studies, and many other areas.
We know that;
Number of moles = Mass/Molar mass = Concentration * volume
Mass = Concentration * volume * molar mass
Mass =[tex]1.6 * 10^-4[/tex]* 90/1000 L * 62 g/mol
= 0.000892 g or 892 μg
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Look at the diagram. Which shows the correct arrangement of electrons in a chlorine molecule?
Enter your answer as a number
The correct arrangement of electrons in a chlorine molecule ionic is shown in D in the image attached.
option D is correct.
What is chemical Compound?Chemical Compound is described as a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent bond is present in molecule HCl. Hydrogen has 1 electron in its outermost shell. Chlorine has 7 electrons in its valence shell. So one one electron from each element is shared between them to form a covalent bond.
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Which statement describes the law of conservation of energy?
O All systems will exchange matter and energy with their surroundings.
O All systems can exchange energy, but not matter, with their surroundings.
O Energy cannot be created nor destroyed, but it changes from one form to another.
O Energy is destroyed in most chemical reactions when new products are formed.
Answer:
option C is the correct answer
Explanation:
that's the law of the conservation of energy itself
Option C: The statement that best describes the law of conservation of energy is that energy cannot be created nor destroyed, but it changes from one form to another. The first law of thermodynamics, also referred to as this principle, asserts that the total energy within a closed system remains constant throughout its duration.
Energy may transform from one form to another, such as from kinetic to potential or from thermal to mechanical, but the total energy remains unchanged. This fundamental law has far-reaching implications in various scientific disciplines. It underlies the understanding of energy transfers and conversions in mechanical systems, chemical reactions, and even biological processes. It serves as a guiding principle for studying energy flow and efficiency in different contexts.
The law of conservation of energy has significant practical applications. It allows scientists and engineers to analyze and design systems with a clear understanding of energy conservation. It enables the development of energy-saving technologies and sustainable practices.
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even one or two crystals of copper sulphate can make its solution in water coloured blue. why
A student is investigating the affect of different salts on melting points. Four patches of ice of equal size are roped off and a different type of salt is poured on each, one receives table salt (NaCl), one receives Calcium Chloride (CaCl2), one receives Potassium Carbonate (KCO3) and the fourth receives inert sand instead. Each patch receives an equal amount of salt or sand. The student measures the volume of ice remaining and subtracts it from the original volume of ice to see how much melted away. What is the dependent variable?
A. The type of salt applied to the ice.
B. The size of the ice patches.
C. The amount of ice that melted.
D. The ice that received sand.
Answer:
C
Explanation:
A is the independent variable
D and B are control variables
Which of the following statements is true?
A.
Chemical reactions can either absorb thermal energy or release thermal energy.
B.
Chemical reactions can only release thermal energy.
C.
Chemical reactions can only absorb thermal energy.
D.
Chemical reactions can neither absorb thermal energy nor release thermal energy.
The correct statement is: A. Chemical reactions can either absorb thermal energy or release thermal energy.
All chemical reactions involve energy. In any chemical reaction, energy is required to break the bonds in reactions, and energy is released when new bonds form after the reaction.
Chemical reactions can indeed involve the exchange of thermal energy. Some reactions absorb thermal energy from the surroundings, which is known as an endothermic reaction.
In contrast, other reactions release thermal energy into the surroundings, which is called an exothermic reaction. Therefore, option A is the correct statement.
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Calculate the Kp for the following reaction at 25.0 °C:
H₂(g) + Br₂(g) 2 HBr (g)
Round your answer to 1 significant digit.
AG= -107
kJ
mol
The equilibrium constant for the reaction as it has been shown is [tex]5.7 * 10^{18}[/tex]
What is the equilibrium constant?The quantitative expression of the size of a chemical process at equilibrium is the equilibrium constant, abbreviated as K. It links the reactant and product concentrations (or partial pressures) in a chemical process and gives details on the make-up of the equilibrium mixture. It offers crucial details regarding the proportions of reactants and products.
We know that;
ΔG = -RTlnKp
Thus we have that;
Kp =[tex]e^-[/tex](ΔG/RT)
Kp = [tex]e^-[/tex](-107000 /8.314 * 298)
=[tex]5.7 * 10^{18}[/tex]
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Which of the following statements is true?
A.
Chemical reactions can either absorb thermal energy or release thermal energy.
B.
Chemical reactions can only release thermal energy.
C.
Chemical reactions can only absorb thermal energy.
D.
Chemical reactions can neither absorb thermal energy nor release thermal energy.
7) How many molecules of CO2 are in 2.5 L at STP?
By using the ideal gas law and Avogadro's number, we find that there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.
To determine the number of molecules of CO2 in 2.5 L at STP (Standard Temperature and Pressure), we can use the ideal gas law and Avogadro's number.
Avogadro's number (N_A) is a fundamental constant representing the number of particles (atoms, molecules, ions) in one mole of substance. Its value is approximately 6.022 × 10^23 particles/mol.
STP conditions are defined as a temperature of 273.15 K (0 °C) and a pressure of 1 atmosphere (1 atm).
First, we need to convert the volume from liters to moles of CO2. To do this, we use the ideal gas law equation:
PV = nRT,
where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
Since we have STP conditions, we can substitute the values:
(1 atm) × (2.5 L) = n × (0.0821 L·atm/(mol·K)) × (273.15 K).
Simplifying the equation:
2.5 = n × 22.4149.
Solving for n (the number of moles):
n = 2.5 / 22.4149 ≈ 0.1116 moles.
Next, we can calculate the number of molecules using Avogadro's number:
Number of molecules = n × N_A.
Number of molecules = 0.1116 moles × (6.022 × 10^23 particles/mol).
Number of molecules ≈ 6.72 × 10^22 molecules.
Therefore, there are approximately 6.72 × 10^22 molecules of CO2 in 2.5 L at STP.
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At a certain temperature it is found that 1.83 moles of H2, 2.33 moles of 02 and 3.95 moles of H2O are in equilibrium in a 8.1 L container according to the reaction below. What is the equilibrium constant?
2 H2 (g) + 02 (g) = 2 H20 (g)
Keep extra significant figures during the calculation and round your answer to 1 decimal place.
0.6 is the equilibrium constant for the given reaction.
To calculate the equilibrium constant (K) for the given reaction, we need to use the molar concentrations of the reactants and products at equilibrium. The equilibrium constant expression is given by:
[tex]K= [H_{2}O]^{2} / ([H_{2}^{2} * [O_{2}])[/tex]
Given the moles of H2, O2, and H2O in the 8.1 L container, we can convert them to molar concentrations by dividing the number of moles by the volume:
[H2] = 1.83 moles / 8.1 L
[O2] = 2.33 moles / 8.1 L
[H2O] = 3.95 moles / 8.1 L
Substituting these values into the equilibrium constant expression, we have:
K = [tex](3.95 / 8.1)^{2}[/tex] / ([tex](1.83 / 8.1)^{2}[/tex] * (2.33 / 8.1))
Evaluating this expression and rounding to one decimal place, we find the equilibrium constant to be:
K ≈ 0.6
Therefore, the equilibrium constant for the given reaction is approximately 0.6.
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What is the correct formula that would result from the combination of the two ionic species? Cu2+ and SO42-
if a given sample of metal has a mass of 2.68 g and a volume of 1.03 cm3, what is its density?
Answer: If a given sample of metal has a mass of 2.68 g and a volume of 1.03 cm³, the density of the metal will be 2.6019417476 g/cm³.
Explanation:
To find out the density of any object we must have known values of mass of the object and volume of the object.
Mass- Mass is the amount of matter present in any object or particle. The S.I. unit of mass is the kilogram.
Volume- Volume is defined as the amount of space occupied by an object or particle. The measuring unit of volume is cubic meter (m³)- for larger volumes and cubic centimeters (ccm³) and cubic millimeters (cmm³) for smaller volumes.
Density- Density is the measurement that compares the mass of an object with its volume. The S.I. unit of density is kilogram per cubic meter (kg /m³) and the C.G.S unit is gram per cubic centimeter ( g/ ccm³). Density is denoted by rho (ρ).
The density of an object can be calculated by the following formula:
Density (ρ) = mass (m)/ volume (v)
In the given question, the mass of the object is 2.68 g. i.e. m = 2.68 g and the volume of the given sample is 1.03 cm³ i.e. v = 1.03 cm³.
Hence, by using the above formula and putting the values of mass and volume, we can calculate the density of the sample as below-
Density = mass (m)/ volume (v)
= 2.68 / 1.03
= 2.6019417476 g/cm³
Therefore, for the given sample of metal that has a mass of 2.68 g and volume of 1.03 cm³ will have a density of 2.6019417476 g/cm³.
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