The composition in mol% of the elements are :
4.91% of Al₂O₃ in alloy 95.08% of Cu in alloyGiven data :
Weight percentage of copper alloy = 7.7 wt %
Assume weight of alloy = 100 grams
Applying the weight percentagemass of Al₂O₃ in alloy = 7.7 gm
Mass of Cu in alloy = 100 - 7.7 = 92.3 gm
First step : calculate the mole of elements
i) moles of Al₂O₃ in alloy
= mass of Al₂O₃ in alloy / Atomic mass of Al₂O₃
= 7.7 gm / 102 gm/mol
= 0.075 mol
ii) moles of Cu in alloy
= mass of Cu in alloy / Atomic mass of Cu
= 92.3 gm / 63.5 gm/mol
= 1.45 mol
Therefore the total number of moles in the alloy = 0.075 + 1.45 = 1.525
Next step : Determine the mole percentages
i) Mole percentage of Al₂O₃ in alloy
= ( 0.075 ) / 1.525 * 100
= 4.91%
ii) Mole percentage of Cu in alloy
= ( 1.45 ) / 1.525 * 100
= 95.08%
Hence we can conclude that The composition in mol% of the elements are : 4.91% of Al₂O₃ in alloy and 95.08% of Cu in alloy.
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Which of these compounds would you expect
to contain covalent bonds? Why?
a. KCI
b. PBr3
c. CIBr
d. Nal
Please help me please
1.The mass of empty graduated cylinder was found to be 23.1g. The mass of the
graduated cylinder filled with water has 32 g. Calculate the mass of the water. State
your answer to the correct number of significant figures.
Answer:
mass of water: 8.9 g
Explanation:
Hey there its simple:
mass of water: mass of cylinder with water filled - mass of empty cylinder
mass of water: 32 g - 23.1 g
mass of water: 8.9 g
On a hot day, you might cool off by sitting in the shade of a big tree, eating a cold popsicle, going into an air-conditioned building, or jumping into a cold lake. Which of these are examples of using technology?
Answer:
Air conditionded building
Explanation: Ice cream is processed food so techniacally it could be using technology but Air conditioning is a unit of metal and is built. Hope this is right!
The size (diameters) of five atoms are in the order R<T<W<Y. Y being largest, if each has an electron situated on
its circumference, neglecting other factors, which of the atoms will lose its elctron most reluctantly? A. R B. T
C. W D. X E. Y
The atom that has the smallest diameter will have the greatest electron attraction, so the electrons will be difficult to escape
So atom R will lose its electron most reluctantly
40
0 JO %
20
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0
0
5
10
15
20
25
30
35
40
45
50
Time (Days)
You start with a 500 g sample of Co-57. About how much time has passed if you end up with a 250 g sample?
A
10 days
B
20 days
30 day
Loy
Answer:
what you've asked so I guess the answer will be 10 days
How many kilometers are there in 3.4 miles
Answer: 5.47177
For every Mile there is 1.60934 Kilometers
so we take 3.4 and multiply it by 1.60934
3.4 x 1.60934
= 5.47177 Km
What can be separated by filtration
Answer:
Filtration is the process of separating solids from liquids using filter paper. The process can be used to separate an insoluble solid, for example, stone or sand grains from a liquid. The liquid could be a pure liquid, for example, water, or it could be a solution, for example, salty water.
Explanation:
Answer:
solids for liquids
Explanation:
The process can be used to separate an insoluble solid, for example stone or sand grains from a liquid.
The reaction between ammonia and nitrous oxide is given below:
[tex]2NH3(g) + 3N2O(g)→ 4N2(g) + 3H2O(g)[/tex]
We therefore know that which of the following reactions can also occur?
AnswerAnswer:
Explanation:The Answer is Option A
How many Joules are released to cool 250.0 grams of liquid water from 100°C to 0°C? The specific heat of water is 4.180 J/g.C.
Is this endothermic or exothermic?
[tex]\bold{\huge{\orange{\underline{ Solution}}}}[/tex]
[tex]\bold{\underline{ Given :- }}[/tex]
We have 250g of liquid water and it needs to be cool at temperature from 100° C to 0° CSpecific heat of water is 4.180J/g°C[tex]\bold{\underline{ To \: Find :- }}[/tex]
We have to find the total number of joules released.[tex]\bold{\underline{ Let's \:Begin:- }}[/tex]
We know that,
Amount of heat energy = mass * specific heat * change in temperature
That is,
[tex]\sf{\red{ Q = mcΔT }}[/tex]
Subsitute the required values in the above formula :-
[tex]\sf{ Q = 250 × 4.180 ×(0 - 100 )}[/tex]
[tex]\sf{ Q = 250 × 4.180 × - 100 }[/tex]
[tex]\sf{ Q = 250 × - 418}[/tex]
[tex]\sf{\pink{ Q = - 104,500 J }}[/tex]
Hence, 104,500 J of heat is released to cool 250 grams of liquid water from 100° C to 0° C.
[tex]\bold{\underline{ Now :- }}[/tex]
We have to tell whether the above process is endothermic or exothermic :-
Here, In the above process ΔT is negative and as a result of it Q is also negative that means above process is Exothermic
Exothermic process :- It is the process in which heat is evolved . Endothermic process :- It is the process in which heat is absorbed .Calculate the molality of a solution that contains 1.875 g of potassium chloride (KCl) in 175g water.
When a liquid freezes, its particles get ____. This could result from the pressure ____.
A.farther apart; decreasing/ B.closer together; decreasing/C.farther apart; increasing /D.closer together; increasing
Answer:
farther apart; increasing
Explanation:
The particles in a liquid are less tightly packed together so an increase in pressure makes the particles in a liquid get farther apart.
In an experiment, you measure a solution absorbance of 0.2 with a path length of 1cm. If the molar absorptivity coefficient is 59 cm-1 M-1, what is the concentration in Molarity?
A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, the molarity is 0.003 M.
What does Beer-Lambert law state?The Beer-Lambert law states that for a given material sample, path length and concentration of the sample are directly proportional to the absorbance of the light.
A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, we can calculate the molarity of the solution using the following expression.
A = ε × b × c
c = A / ε × b
c = 0.2 / (59 cm⁻¹ M⁻¹) × 1 cm = 0.003 M
where,
A is the absorbance.ε is the path length.b is the molar absorptivity coefficient.c is the molar concentration.A solution has an absorbance of 0.2 with a path length of 1 cm. Given the molar absorptivity coefficient is 59 cm⁻¹ M⁻¹, the molarity is 0.003 M.
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If you have a room that is 14 feet wide, 20.5 feet long, with 10 foot ceilings. What is the total
square foot area?
Answer:
i got 6
Explanation:
Because 14 feet divide by 20.5 gives you 0.6
so it 0.6 times 10 =6
Answer:
140 square feet
Explanation:
Given the following question:
Room is 14 feet wide = the width
20.5 feet long = the length
10-foot ceilings = the height
Area = Width × Height
[tex]A=10\times14=140[/tex]
[tex]A=140 ft^2[/tex]
The area of the room is "140 square feet."
Hope this helps.
The Haber-Bosch process operates at reaction pressures of 200.0
atm and higher. What is this pressure in psi?
A sample of the alloy “electrum” is 62% silver and 38% gold by mass; mass of part/
mass total× 100%. What is the ratio of the number of silver to gold atoms?
Answer:
c
Explanation:
edge 2022
QUESTION 6 Calculate the molality of the HCI (aq) using the below information: Formula weight (g/mol): 36.465 Density of the solution (g/ml): 1.19 Weight %: 37.2 Molarity: 12.1 Your answer should have 3 sf) QUESTION 7 Calculate the molality of the NH3(aq)
A 12.1 M HCl solution with a density of 1.19 g/mL has a molality of 16.1 m.
What is molality?Molality is defined as the total moles of a solute contained in a kilogram of a solvent.
Let's suppose we have 1 L of the solution.
Step 1: Calculate the moles and mass of HCl (solute) in 1 L of solution.The solution is 12.1 M, that is, there are 12.1 moles of HCl in 1 L of solution.
The molar mass of HCl is 36.465 g/mol.
12.1 mol × 36.465 g/mol = 441 g
Step 2: Calculate the mass corresponding to 1 L of solution.The density of the solution is 1.19 g/mL.
1000 mL × 1.19 g/mL = 1190 g
Step 3: Calculate the mass of water (solvent) in 1190 g of solution.In 1190 g of solution, there are 441 g of HCl.
mWater = 1190 g - 441 g = 749 g = 0.749 kg
Step 4: Calculate the molality (b) of the solution.b = 12.1 mol / 0.749 kg = 16.1 m
A 12.1 M HCl solution with a density of 1.19 g/mL has a molality of 16.1 m.
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0-2
How many electrons moved to make the above
oxygen ion?
received 1 electron
gave 2 electrons away
gave 1 electron away
received 2 electrons
Answer:
received 2 electrons
Explanation:
Since a neutrally charged oxygen has 8 electrons (-) and 8 protons (+), an oxygen ion with a charge of -2 and would have 10 electrons.
What information is provided by the modern periodic table, which is based on the one that Mendeleev developed? Choose the two statements that
apply.
A. It lists all the physical properties of the elements.
B. It organizes the elements according to their properties.
C. It identifies the particles that make up the atom of each element.
D. It lists the number of protons in the atoms that make up each element.
E. It organizes both elements and compounds based on chemical properties.
Answer:
( essay ) a time when i got lost somewhere
Beer-law Plot Absorbance vs. Concentration
Answer:
Solve algebraically by setting the y equal to 0.892 = 0.355x + 0.058. Then subtract the 0.058 over then follow by dividing by 0.355. You will then get the x value equal to your concentration. The answer is 2.676.
Hope this helps!
Explanation:
6. What pattern did you notice in valence electron configuration as you moved through
elements 3–18?
Answer:
The maximum number of valence electrons is 8
Explanation:
element 3 has 3 valence electrons. 7 has 5, and 10 has 8, as we increased the number of electrons in element 11, the number of valence electrons became 3, and the pattern went on, it cannot exceed 8.
The electron configuration of an atom depicts the arrangement of electrons scattered throughout the orbital shells and subshells.
What is period 3 group 18's electron configuration?According to the Periodic Table, P3- has the same electrical configuration as argon, the next Noble gas (Group 18) element, which is 2,8,8.The number of valence electrons in groups 1-2 and 13-18 increases by one from one element to the next across the periodic table's rows, or periods.Electron configurations include: Two trends or patterns should be obvious: For elements in the same Group, the number of valence shell electrons is constant. The number of valence electrons increases from left to right along a Periodic Table period.What substance has a three charge and 18 electrons?Looking at a periodic table or table of elements, we can see that phosphorus (symbol P) has an atomic number of 15.As a result, each atom has 15 protons. The alkali metals are composed of the chemical elements lithium (Li), sodium (Na), potassium (K), rubidium (Rb), caesium (Cs), and francium (Fr).To Learn more About electron configuration, Refer:
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What is the height on human
Answer:
5 feet 6 inches is the optimal height for a human
100 points+Brainliest for correct answer
An electron on an energy level has an energy of 16.32 x 10−19 J. It moves to another level by releasing 5.4 x 10−19 J of energy. Which of the following descriptions mostly likely explains what occurred?
The electron moved down to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved down to an energy level and has an energy of 21.72 x 10−19 J.
The electron moved up to an energy level and has an energy of 10.92 x 10−19 J.
The electron moved up to an energy level and has an energy of 21.72 x 10−19 J.
Answer:
j=my 21.67-2x
Explanation:
under stand please mark me the brainliest
Na2CO3+Ca(NO3)2⟶CaCO3+2NaNO3 what mass of calcium nitrate in grams is needed to produce 4.93 mol of sodium nitrate?
Answer:
404.47692 g
Explanation:
Na₂CO₃ + Ca(NO₃)₂ ⇒ CaCO₃ + 2NaNO₃
From the coefficients in the balanced chemical equation, we see that the ratio of Ca(NO₃)₂ and 2NaNO₃ is 1:2, so every 1 mol of Ca(NO₃)₂ produces 2 mols of 2NaNO₃.
(4.93 mol NaNO₃)([tex]\frac{Ca(NO3)2}{2NaNO3}[/tex]) = 2.465 mol Ca(NO₃)₂
Then, we need to convert from moles to grams, since we are asked to find the mass of Ca(NO₃)₂. To do this, we need to look up the molar mass of Ca(NO₃)₂, which is 164.088 g/mol.
(2.465 mol Ca(NO₃)₂ ) ( [tex]\frac{164.088 g}{1 mol}[/tex]) = 404.47692 g
Thus, 404.47692 grams of Ca(NO₃)₂ is needed to produce 4.93 mol of 2NaNO₃.
Identify whether the following changes would increase or decrease the rate constant. (1 point)
Increasing Ea (0.5 point):
Increasing T (0.5 point):
Answer:
Increase
Increase
Explanation:
By increasing the activation energy (Ea) the rate constant decreases and by increasing the temperature (T) the rate constant increases.
What is Rate Constant ?
The rate constant is also known as specific rate constant is a proportionality factor between rate of reaction and concentration.
Arrhenius Equation[tex]k = Ae^{-\frac{Ea}{RT}}[/tex]
Where,
k = Chemical reaction rate
A = Pre-exponential Factor
Ea = Activation energy
R = Gas constant
T = Temperature
Now, check whether the following change increases or decreases the rate constant.
Increasing Ea
According to the Arrhenius Equation the higher the activation energy, the slower the reaction. Rate constant increases exponentially with decreasing Ea and increasing T. So by increasing activation energy (Ea) decreases the rate.
Increasing T
The rate constant increases with increase in temperature. increasing the T of a reaction increases the rate because the rate constant increases a/q to the Arrhenius Equation. So by increasing the temperature increases the rate.
Thus, we can conclude that by increasing the activation energy (Ea) the rate constant decreases and by increasing the temperature (T) the rate constant increases.
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How many oxygen atoms are in 4.00g of quartz?
Answer:
Rounding for significant figures gives us a final answer of 3.41×1022 atoms 3.41 × 10 22 a t o m s atoms of oxygen.
The oxygen atoms in 4.00 g of quartz is 8.4 x 10²² atoms of oxygen.
What are atoms?Atoms are defined as a smallest unit into which matter can be divided without the release of electrically charged particles.
It can also be defined as a building block of matter and were created after big bang theory.
The amount of mole of SiO₂ in 4.00 grams
= 4.00 / 60 = 0.07 moles
As 2 atoms of oxygen atoms are present in quartz formula, the number of mole of O₂ in this formula
= 2 x 0.07 = 0.14 mole
So, the amount of O₂ in 4.00 g of quartz
= 6.02 x 10²³ x 0.14
= 8.4 x 10²² atoms of oxygen.
Thus, the oxygen atoms in 4.00 g of quartz is 8.4 x 10²² atoms of oxygen.
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4. Circle the element with the greatest atomic radius. [4]
C.
a.
sodium or magnesium
b. magnesium or beryllium
lithium or rubidium
d. cesium or radon
oxygen or fluorine
f. phosphorus or aluminum
g. calcium or barium
h. boron or gallium
e.
The atomic greatest radius is magnisium
What is the relationship between organic and DNA and RNA Explain?
Answer:
The two main types of nucleic acids are DNA and RNA. Both DNA and RNA are made from nucleotides, each containing a five-carbon sugar backbone, a phosphate group, and a nitrogen base. DNA provides the code for the cell's activities, while RNA converts that code into proteins to carry out cellular functions.
Explanation:
Find mass percent of each element URGENT PLS HELP!!!
Answer: Think and you will get it right!
Explanation:
To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.
How many moles of oxygen gas are need to produce 5.53 x 10 moles of water (1)
2 H2g) + Oz(9) 2 H2O(1)
Answer:
2.765 × × 10³ moles of O₂
Explanation:
The chemical equation to produce water from oxygen and hydrogen is;
2H₂ (g) + O₂ (g) = 2H₂O (l)
From the equation above, we see that;
2 moles of H₂O is produced from 1 mole of O₂
Thus; 5.53 × 10³ moles of H₂O will require;
(5.53 x 10³ moles of H₂O × 1 mole of O₂)/2 moles of H₂O = 2.765 × × 10³ moles of O₂
Someone can help me please??
C to D
Explanation:
it rises faster between those two points