Answers
The mass of melted gold to release the energy would be 3, 688. 8 Kg
How to determine the massThe formula for quantity of energy is given thus;
Q = n × HF
Where n represents number of moles
HF represents heat of fusion
To find the number of moles, we have
235.0 = n × 12.550
number of moles = \(\frac{235}{12. 550}\) = 18. 725 moles
Note that molar mass of Gold is 197g/ mol
Let's note that;
Number of moles = mass/ molar mass
Mass = number of moles × molar mass
Mass = 18. 725 × 197
Mass = 3, 688. 8 Kg
Thus, the mass of melted gold to release the energy would be 3, 688. 8 Kg
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Related Questions
A 950.0 mL solution of potassium permanganate was made by dissolving 45.0 g KMnO4 in 750.0 mL of water. Assume water has a density of 1.00 g/mL. (Molar Mass for H = 1 , O = 16 , K= 39 , Mn= 55 ) The mole fraction of the solute =
Answers
Answer:
The correct answer is 6.67×10⁻³.
Explanation:
Based on the given question, the amount of solute (KmNO4) is 45 grams. The molecular weight of KmNO4 is 158 gram per mole. The moles of solute can be determined by using the formula,
n = mass/molecular weight
n = 45/158 = 0.28
The amount of solvent (water) given is 750 milliliters, and the density of water is 1 gm. per ml, 18 gram per mole is the molecular weight of water. So, the moles of solvent will be,
n = 750/18 = 41.7
The formula for calculating mole fraction is,
Mole fraction = mole of solute / (mass of solute + mole of solvent)
The mole fraction of solute can be determined by putting the values in the above mentioned formula,
Mole fraction of KmNO4 = 0.28/(0.28+41.7)
= 0.28/41.98
= 6.67 × 10⁻³ or 7 × 10⁻³.
Let's repeat this process for the atoms that make up the substances that do not conduct when dissolved in water. What do you notice now?
Answers
Answer:
Explanation:
If they do not disolve in water they are non electrolyte and hence will not conduct eletricity. If you had a lab where a batter was supplying power and the wire carryin the electricity went through a water bath if the water was pure and nothing disolved in it the light would not turn on but if you added something like salt it would conduct the electricity
How many moles of solute are present in 620 mL of a 7.0 M solution . Round to 0.01
Answers
Answer:
There are 4.34 moles of solute.
Explanation:
The concentration of the solution of 7.0M, means that there are 7.0 moles of solute in 1000mL (1L) of solution.
In this case, we only have 620mL, so with the concentration and a mathematical rule of three we can calulate the moles of solute in 620mL:
\(\begin{gathered} 1000mL-7.0moles \\ 620mL-x=\frac{620mL*7.0moles}{1000mL} \\ x=4.34moles \end{gathered}\)Finally, there are 4.34 moles of solute.
How long does it take, in minutes, for light to reach Earth from the Sun, a distance of 1.560 x 10% km?
Answers
Explanation:
distance = 1.560 × 10⁸ km= 1.560×10¹¹m
Speed (of light) = 3×10⁸m/s
time = distance/speed
=>1.560×10¹¹/3×10⁵ = 0.52×10⁶s = 52×10⁴ seconds.
hope this helps you.
What is the name for Si3S
Answers
Answer:
Silicopropane
Explanation:
Q1. Consider respiration, one of the most common chemical reactions on earth occur according
to the reaction:
C6H1206 +602 = 6CO2 + 6H2O + energy
What mass of CO2 forms in the reaction of 25g of glucose with 40g of oxygen?
Answers
Answer: First we need to know how many moles of each reactant there are.
C6H12O6 : 25g/180.06g/mol=0.1388mol
O2: 40g/32g/mol=1.25mol
The equation tells us we need 6 moles of O2 for every 1 mole of Glucose.
6 x 0.1388 = 0.8328
So, we have more O2 then needed – it is in excess.
Glucose is the limiting reagent – we use this for the calculation.
The equation tells us we make 6 moles of CO2 for every 1 mole of Glucose
So, we make 0,8328 moles of Carbon Dioxide
Explanation:
Which statement describes a chemical property of sodium
A Sodium changes from a solid to liquid at a temperature of 97.8°C
B Sodium has the ability to react with chlorine and from a new substance.
C Sodium has destiny if 0.97 g/cm3.
D Sodium takes the form of a solid at room temperature
Answers
Answer:
Option b is show the chemical property of sodium....
Predict the decay process and write the nuclear equation of Cf- 255
Answers
Answer:
curium
−
243
,
252
/
99
Es,
251
/
98
Cf,
214
/
82
Pb
Explanation: Im not very good with this but here ya go!
How many moles of air must there be in a bicycle tire with a volume of 2.67 L if it has an internal pressure of 7.30 atm at 17.0°C?
Answers
Answer: .819 Moles of Air
Explanation: To solve this problem, we will use the Ideal Gas Law which states that PV=nRT. P represents pressure or internal pressure, V is volume, T is temperature, n is moles of a gas, and R is the Universal Gas Constant. For the ideal gas law, R is .08206. R is 8.314 for any other calculation. We are solving for the moles of gas. The gas in this case is air which is a mixture of gases but that isn't important.
Our givens are P = 7.3 atm, V = 2.67 L and T = 17.0°C. We convert T to Kelvin because the Ideal Gas Law requires that. We simply add 273 to the value in Celcius to convert it to Kelvin. Our T is now 290 K. We also know R is our Universal Gas Constant. We can now plug into the law.
(7.3 atm)(2.67 L) = n(.08206)(290 K)
n = ((7.3 atm)(2.67 L))/(.08206)(290 K)
n = .819 moles of air
Hope this helps!
Based upon the ion charge of the following polyatomic ions, predict the formula for the following compounds.
sulfate = SO42
phosphate = PO43
hydroxide OH-
sodium hydroxide
O Na(OH)2
O Na(OH)3
O Na₂OH
O NaOH
Answers
Answer:
D.) NaOH
Explanation:
Sodium always forms the cation, Na⁺.
Hydroxide is always written as OH⁻.
The compound should have an overall charge of 0 (be neutral). As you can see, the charges perfectly balance out (+1 + (-1) = 0). Therefore, there only needs to be one atom of each ion. The ionic compound is thus NaOH.
A student mixes 5.00 mL of 2.00 x 10-3 M Fe(NO3)3 with 5.00 mL of 2.00 x 10-3 M KSCN. She finds that in the equilibrium mixture the of concentration of FeSCN2+ is 1.40 x 10-4 M.
a) What is the initial concentration in solution of the Fe3+ and SCN- ?
b) What is the equilibrium constant for the reaction?
Answers
part a.)
The initial concentration in solution of the Fe3+ and SCN- is:
moles of Fe3+ = (2.00 x 10^-3 M) x (5.00 x 10^-3 L) = 1.00 x 10^-5 mol
moles of SCN- = (2.00 x 10^-3 M) x (5.00 x 10^-3 L) = 1.00 x 10^-5 mol
part b)
The equilibrium constant for the reaction is 1.54 x 10^10.
How do we calculate?Fe(NO3)3(aq) + 3KSCN(aq) ⇌ Fe(SCN)3(aq) + 3KNO3(aq)
b)
Therefore, the equilibrium concentration of Fe(SCN)2+ is also 1.40 x 10^-4 M.
Applying law of mass action, the equilibrium constant expression for the reaction is:
Kc = [Fe(SCN)2+] / ([Fe3+] [SCN-]3)
Kc = (1.40 x 10^-4) / [(1.00 x 10^-5) (1.00 x 10^-5)^3]
Kc = 1.54 x 10^10
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Please help me as soon as possible! Thanks so so much!!!
Answers
The equilibrium constant, which indicates how far a chemical process progresses, is a thermodynamic quantity.
What is the equilibrium constant?
The equilibrium constant is a ratio of the concentrations (or partial pressures) of the products to the concentrations (or partial pressures) of the reactants.
1) The equilibrium constant is;
Keq = 1/(3.5) * (1.5)^2
Keq = 0.13
2) 0.15 = [0.25]/1 * [CO2]
[CO2] = [0.25]/0.15
[CO2] =1.67
3) Ksp = [Mg^+] [Cl^-]^2
4 * 10^-2 = [Mg^+] * [3.5 * 10^-3]^2
[Mg^+] = 4 * 10^-2/ [3.5 * 10^-3]^2
= 3.3 * 10^-5 M
4) Ksp = x^2
Ksp = (2 * 10^-3)^2
= 4 * 10^-6
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Which is the state of matter that has an indefinite shape and indefinite volume?
Answers
Answer:
gas
Explanation:
gas: indefinite shape, indefinite volume. Indefinite shape means that the sample in question takes on the shape of the container.
Nadia runs from her house to a fiend's house that is 24 meters away. How much time she will take to reach her friend's house, knowing that Nadia's speed is 3 m/s .
Answers
Nadia will take 8 seconds to reach her friend's house.
Speed is the measure of the distance traveled by an object per unit of time. It is a scalar quantity and is typically expressed in units such as meters per second (m/s), miles per hour (mph), or kilometers per hour (km/h).
To calculate the time Nadia will take to reach her friend's house, we can use the formula;
time = distance / speed
where distance is the amount of space traveled by an object, and time is the duration of travel.
Put the values given in the problem, we have:
time = 24 meters / 3 m/s
time = 8 seconds
Therefore, Nadia will take 8 seconds.
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prepare an editorial for national newspaper Daily highlighting the importance of sustainable development
Answers
SERIOUS flooding IN DELHI
Explanation:
Acetone has a boiling point of 56.5 celcius. How many grams of the acetone vapor would occupy the 250 mL Erlenmeyer flask at 57 celcius and mm Hg
Answers
Answer:
0.515 g
Explanation:
Acetone (C₃H₆O) has a boiling point of 56.5 °C. How many grams of the acetone vapor would occupy the 250 mL Erlenmeyer flask at 57 °C and 730 mmHg?
Step 1: Given data
Temperature (T): 57°C
Pressure (P): 730 mmHg
Volume (V): 250 mL
Step 2: Convert "T" to Kelvin
We will use the following expression.
K = °C + 273.15 = 57°C + 273.15 = 330 K
Step 3: Convert "P" to atm
We will use the conversion factor 1 atm = 760 mmHg.
730 mmHg × (1 atm/760 mmHg) = 0.961 atm
Step 4: Convert "V" to L
We will use the conversion factor 1 L = 1,000 mL.
250 mL × (1 L/1,000 mL) = 0.250 L
Step 5: Calculate the moles (n) of acetone
We will use the ideal gas equation.
P × V = n × R × T
n = P × V/R × T
n = 0.961 atm × 0.250 L/(0.0821 atm.L/mol.K) × 330 K
n = 8.87 × 10⁻³ mol
Step 6: Calculate the mass corresponding to 8.87 × 10⁻³ moles of acetone
The molar mass of acetone is 58.08 g/mol.
8.87 × 10⁻³ mol × 58.08 g/mol = 0.515 g
The mass of acetone vapor in grams is equal to 0.515 grams.
Given the following data:
Boiling point = 56.5°C.Volume = 250 mL to L = 0.250 liter.Temperature = 57°C to Kelvin = 330 K.Pressure = 760 mmHg to atm = 0.961 1tm.Scientific data:
Molar mass of acetone = 58.08 g/mol.Ideal gas constant = 0.0821.To calculate the mass of acetone vapor in grams:
How to calculate the mass of a gas.First of all, we would determine the number of moles by using the ideal gas equation:
\(n = \frac{PV}{RT} \\\\n = \frac{0.961 \times 0.250}{0.0821 \times 330}\\\\n = \frac{0.24025}{27.093}\)
n = 0.008868 moles.
For the mass:
\(Mass = number \;of \;moles \times molar\;mass\\\\Mass = 0.008868 \times 58.08\)
Mass = 0.515 grams.
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Giving the following reactions and associated equilibrium constants, what is the equilibrium constant for the following reaction?
Answers
Step 1 - Understanding the equations
Let's first note that the equation whose equilibrium constant is not known can be obtained from the previous equations. In order to do so, we have to sum the given equations, inverting them:
\(\begin{gathered} SO_{3(g)}\leftrightarrows SO_{2(g)}+\frac{1}{2}O_{2(g)} \\ \\ NO_{(g)}+\frac{1}{2}O_{2(g)}\leftrightarrows NO_{2(g)} \end{gathered}\)Note we have inverted the given equations. By summing these two equations, we will get the final one.
Step 2 - Manipulating the equilibrium constants
When we invert an equation, the equilibrium constant must also be inverted, like this:
\(K_{inverted}=\frac{1}{K}\)Let's invert both equilibrium equations for reactions 1 and 2:
\(\begin{gathered} K_{1,\text{ inv}}=\frac{1}{K_1}=\frac{1}{3.1}=0.32 \\ \\ K_{2,\imaginaryI\text{nv}}=\frac{1}{K_2}=\frac{1}{4.5}=0.22 \end{gathered}\)Step 3 - Finding the new equilibrium constant
The equilibrium constant of an equation that is the sum of other equations can be obtained by multiplying the equilibrium constants of the added equations.
Therefore, for this exercise, we have:
\(K_{new}=K_{1,inv}\times K_{2,inv}\)Substituting the constants of the equations we already know, we get:
\(K_{new}=0.32\times0.22=0.07\)Answer: K new = 0.07
solution solution solution
Answers
Answer:
Oxygen present in food items makes then rancid due to the presence of oils and fats. If the food is flushed with nitrogen, it prevents it from being oxidised (the nitrogen acts as an antioxidant).
Hope it helps ! :)
boiling and melting points exploration
Answers
Answer:
Boiling- 212° F melting- 32°F
Explanation:
In what region of the graph above is the substance a gas?
Answers
We see in the graph how the substance behaves when the temperature is raised. We will assume that the pressure exerted on the substance is constant and that there is no input or output of material. In addition, we will assume that initially, the substance is in the solid phase.
When we apply energy to a substance, it will begin to raise its temperature until it reaches a phase change. This phase change can be solid to liquid or liquid to gas. When there is a phase change the energy that is added is used to make this transition and there will be no increase in temperature.
Now let's see the graph. At points BC and DE the temperature does not change with time, so at these two segments, there is a phase change. BC will be a phase change from solid to liquid and DE the phase change from liquid to gas. Let's see it on the graph
Therefore, the gas phase will be in segment EF
Answer: EF
Reaction A requires 300 J to proceed. Reaction B requires 200 J to proceed.
Both reactions are currently at an energy level of 160 J. Both reactions are at a temperature of 50 °C Both reactions have reactants at a concentration of 5 M. Increasing temperature by an additional 20 °C adds 50 J of energy to the current energy level.
Increasing concentration by an additional 4 M adds 100 J to the current energy level.
If you do both of the above increases to Reaction A, will it proceed?
Answers
Even with the additional energy input from increasing both the temperature and concentration, Reaction A will not proceed.
To determine if Reaction A will proceed after both increases, we need to calculate the total energy change for Reaction A.
First, let's calculate the energy change for increasing the temperature by 20°C:
ΔE1 = 50 J
Next, let's calculate the energy change for increasing the concentration by 4 M:
ΔE2 = 100 J
The total energy change for Reaction A is:
ΔEA = ΔE1 + ΔE2 + 300 J = 450 J
Since the current energy level of Reaction A is only 160 J, which is less than the required energy change of 450 J, Reaction A will not proceed even if we increase the temperature and concentration.
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Question 12 (1 point)
You notice light pollution in
a.space
b.big cities
c.rural areas
d.our galaxy
Answers
Answer:
the answer is D . our galaxy
Answer:
our galaxy of course
How would I create a Lewis dot structure with the compound: CHBr2Cl
Answers
Answer:
Step 1: Find the Total Number of Valence Electrons. ...
Step 2: Find the Number of Electrons Needed to Make the Atoms "Happy" ...
Step 3: Determine the Number of Bonds in the Molecule. ...
Step 4: Choose a Central Atom. ...
Step 5: Draw a Skeletal Structure. ...
Step 6: Place Electrons Around Outside Ato
Explanation:
1. Your knee cap (patella) is just a hard cartilage. True or False?
2.When a muscle is working it can only contract, or get shorter. True or False?
3. When a muscle is NOT working, the opposing muscle is contracting and THIS is what moves the bone True or False?
4. What is the soft tissue between bones called?
5. What do Tendons do
6. What do you have that an octopus doesn’t have... physically?
Answers
2. From the nervous system yes
3. True
4. Tendon
5. Make a soft cushion in your bones
6. Hair
Why is Nertic zone particularly rich in living things?
Answers
Answer:
It is rich in organisms because sunlight passes through its shallow water enabling photosynthesis to occur.
Explanation:
I hope that helped!!
Calculating partial pressure in a gas mixture A 6.00 L tank at 25.4 °C is filled with 8.90 g of carbon monoxide gas and 3.63 g of chlorine pentafluoride gas. You can assume both gases behave as ideal gases under these conditions. Calculate the mole fraction and partial pressure of each gas, and the total pressure in the tank. Be sure your answers have the correct number of significant digits.
Mole fraction: carbon monoxide partial pressure atm mole fraction chlorine pentafluoride partial pressure atm Total pressure in tank: atm
Answers
According to the given statement Partial pressure CO: 2.56 atm, Mole fraction ClF₅: 0.0383 and Partial pressure ClF₅: 0.11 atm.
What is the purpose of monoxide?Hydrogen, electrocatalysts, pure metals, anhydrides, formic, methyl formate, N,N-dimethylformamide, benzoic acid, and as a reduction agent in coke ovens are all produced using carbon monoxide.
Briefing:
We should apply the Ideal Gases Law to solve this:
P . V = n . R . T
We need n, which is the total moles for the mixture
Total moles = Moles of CO + Moles of ClF₅
Moles of CO = mass of CO / molar mass CO → 8.9 g/28 g/mol = 0.317 mol
Moles of ClF₅ = mass of ClF₅ / molar mass ClF₅ → 3.63g/ 130.45 g/m = 0.0278 mol
0.317 mol + 0.0278 mol → 0.398 moles in the mixture
So we have the total moles so with the formula we would know the total pressure.
P . 6L = 0.724 mol . 0.082L.atm/mol.K . 292.2K
P = ( 0.724 mol . 0.082L.atm/mol.K . 292.2K) / 6L
P = 2.89 atm
Mole fraction is defined as the quotient between the moles of gas over total moles, and it is equal to partial pressure of that gas over total pressure
Partial pressure for gas X/Total pressures = Moles of gases X/Total mole
(Moles of gas X / Total moles) . Total pressure = Partial pressure of gas X
Mole fraction CO = 0.317 / 0.724 = 0.437
Partial pressure CO = 0.88 . 2.89 atm → 2.56 atm
Mole fraction ClF₅ = 0.0278 / 0.724 = 0.0383
Partial pressure ClF₅ = 0.0383 . 2.89 atm → 0.110 atm
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Use the chemical equation to complete the activity.
H2(g) + I2(g) → 2HI(g)
A student makes the following statements:
Hydrogen always has the same oxidation number, so it has an oxidation number of +1 in both the reactant H2 and product HI.
Iodine is in Group VIIA, so it has an oxidation number of –1 in both the reactant I2 and product HI.
Neither hydrogen nor iodine changes oxidation states, so the reaction is not a redox reaction.
In three to five sentences, describe the mistake that the student made, and determine whether or not the reaction is a redox reaction. Explain your answer.
Answers
The oxidation number of hydrogen increases to +1 while the oxidation number of iodine decreases to -1.
We must recall that the oxidation number of a particular atom or ion in any chemical specie is decided based on some arbitrary rules. Those rules are used to tell what the correct oxidation number of an atom should be in a compound or ion.
Firstly, the oxidation number of iodine and oxygen in the gas molecules is zero. The oxidation number of substances is not constant. However, on the right hand side, the oxidation number of hydrogen increases to +1 while the oxidation number of iodine decreases to -1.
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Which two nuclides are isotopes of the same element
Answers
Answer:
1940K and 1939K Isotopes are two forms of the same element that have different numbers of neutrons in the nucleus. This means same symbol, and same atomic number (subscript), but different mass number (superscript).
The average birth weight of domestic cats is about 3 ounces. Assume that the distribution of birth weights is Normal with a standard deviation of 0 4 ounce.
a. Find the birtn weight of cats at the 90th percentile.
b. Find the birth weight of cats at the 10th percentile
Answers
The birth weight of cats at the 90th percentile would be approximately 3.7 ounces. b. The birth weight of cats at the 10th percentile would be approximately 2.3 ounces.
What are the methods of calculating weight?There are three main methods of calculating weight:
1. Balance Beam Scale: A balance beam scale is an example of a mechanical weighing system. It uses a set of calibrated weights to measure the weight of an object.
2. Digital Scale: A digital scale uses an electronic or digital readout to display the weight of an object.
3. Calipers: Calipers are devices used to measure the distance between two points, such as thickness or diameter. They come in various sizes and shapes, depending on the type of measurement the user wants to take.
What is birth weight?Birth weight is the weight of a baby at the time of birth. It is usually measured soon after delivery, with a special baby scale, though sometimes the baby's weight is estimated. The normal range of birth weight is anywhere between 5 lbs 8 oz and 10 lbs, though preterm or premature babies may be significantly lighter. A baby's birth weight is important because it can provide a clue to the baby's overall health. High birth weights may indicate an underlying medical condition, and low birth weights can be a sign of premature or difficult delivery and health risks associated with such a delivery.
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Question 5 of 10
Which statement describes the law of conservation of energy?
A. When an energy transformation happens, no energy is destroyed
or created.
B. There is only one form of energy.
C. Energy can only change from nuclear energy to chemical energy.
D. The total energy in a system can only increase.
Answers
Answer:
A
Explanation:
A option is correct .
you cannot create energy neither you can destroy it but you can only convert into other form