The average atomic mass of the element, Uk is 67.44 amu.
What is the average atomic mass of the element, Uk?The average atomic mass of the element Uk is determined from the sum of the isotopic masses of the isotopes of the element and their relative abundances.
average atomic mass = sum of (isotopic mass * relative abundance) of the isotopesThe isotopic masses and relative abundance of the isotopes are given below:
Isotope:Uk-66; Isotopic mass = 65.994; relative abundance = 58.00%
Isotope:Uk-69; Isotopic mass = 68.958; relative abundance = ?
Isotope:Uk-71; Isotopic mass = 70.975; relative abundance = 10.00%
Relative abundance of Uk-69 = 100% - (58 + 10)% = 32%
The average atomic mass of Uk = (65.994 * 58.00%) + (68.958 * 32%) + (70.975 * 10.00%)
The average atomic mass of Uk = 67.44 amu
In conclusion, the average atomic mass of an element is obtained from the of the isotopic masses of the isotopes of the element and their relative abundances.
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What mass in grams of CH₃OH (MM = 32.04 g/mol) would need to be added to 380.1 g of water in order to lower the freezing point of water by 12.0 °C? (Kf for water is 1.86 °C/m)
Mass in grams of CH₃OH would need to be added to 380.1 g of water in order to lower the freezing point of water by 12.0 °C is 78.53 g .
The depression in freezing point is given as :
ΔT = i × K × m
given that :
molar mass of CH₃OH = 32.04 g/mol
volume of water = 380.1 g = 0.3801 kg
change in freezing point = 12 °C
K = 1.86 °C/m
i = 1 (CH₃OH does not dissociate in water , so i =1 )
putting all the values :
m = 12 / 1 ×1.86
m = 6.45 m
now, molality = moles of solute / solvent in kg
6.45 moles/kg = moles / 0.3801 kg
moles of solute = 2.451 moles
therefore,
mass = moles × molar mass
mass = 2.451 moles × 32.04 g/mol
= 78.53 g CH₃OH is needed
Thus , Mass in grams of CH₃OH would need to be added to 380.1 g of water in order to lower the freezing point of water by 12.0 °C is 78.53 g .
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How many Rh atoms would have to be placed side by side to span a distance of 6.0 um?
22202 are the number of atoms to be placed side by side to span a distance of 6.0um.
What are atoms?The smallest unit of substance into which it is possible to divide without releasing electrically charged particles is the atom.
In addition, it is the smallest unit of matter with chemical element-like characteristics. The atom is thus the fundamental component of chemistry.
An atom of Rhodium (Rh) diameter d = 2.7x[tex]10^{-10}[/tex] m.
Now assuming that keeping n atoms side by side , the distance will be L= 6um = 6.5 x [tex]10^{-6}[/tex] m.
Now, the total length is given by total sum of diameter,
so the equation is given by,
L= nd
n= [tex]\frac{L}{d}[/tex]
n= [tex]\frac{6.0x 10^{-6} m}{2.7x10^{10} } m[/tex]
n= 22202 atoms.
Hence, there are total 22202 Rh atoms have to be placed side by side to span a distance.
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13. Critical Question: In this simulation, you can see that oxygen can be a solid, liquid or a
gas. However, we only see oxygen as a gas on Earth. Why don't we ever see solid or
liquid oxygen on Earth?
Because oxygen is a gas that naturally occurs in the environment, you rarely encounter it as either solid or liquid.
Oxygen is a substance that, depending on its temperature and pressure, can exist as a solid, liquid, or gas. It exists as a gas, specifically a diatomic gas, in the atmosphere. Because oxygen is a gas that naturally occurs in the environment, you rarely encounter it as either solid or liquid. Since gas has too much energy to have volume or structure, it cannot be solid or liquid. Because the tank keeps the gas contained, you can't see oxygen in the air outdoors or in substances like water, which is why you see oxygen tanks (water).
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NEED HELP PLS HELP ME OUT!!
Refer to the image from the lab activity, how many valence electrons are present in nitrogen?
Answer:
I believe it's 5 because, valence electrons are electrons which are on the outer layer of an atom.
Is A fireplace poker glows red when you heat it in the fire a Chemical or
Physical change?
A fireplace poker glowing red when you heat it in the fire is referred to as a physical change.
What is Physical change?This change is a reversible one in the physical properties of a substance such as the size, color etc. Physical change doesn't alter or change the chemical composition of a substance and no new products are formed in this process.
A fireplace poker glowing red when you heat it in the fire doesn't change the composition and is reversible when allowed to cool down which is why physical change was chosen as the most appropriate choice.
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The Minnesota Study is an example of the
The Minnesota Study is an example of the twins study
The Minnesota twin study of adult development began in 1986 to identify what causes individual differences in aging and study of identical (MZ) and fraternal (DZ) twins allows for estimation of how genes and environment affect the aging process and monozygotic or identical twins because they shared 100% of their inherited genes. Therefore, the researchers assumed that any differences between identical twins raised apart would be due to environment and similarities between identical twins raised apart would be due to genetics and this study proves that allow disentanglement of the shared genetic and environmental factors for the trait of interest.
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Number of grams of sodium sulfate that would be required to produce 120
grams of aluminum sulfate.
Number of grams of sodium sulfate that would be required to produce 120 grams of aluminum sulfate is 149g.
What is Mole?Mole is defined as the ratio of given mass to the molar mass of the substance.
Given,
Mass of aluminum sulfate = 120 g
Molar mass of Aluminum sulfate = 342g
Moles of aluminum sulfate can be calculated as
Given mass/ Molar mass
= 120/342
= 0.35mol
Chemical reaction:3(Na2SO4) + 2Al ----- Al2(SO4)3
We noticed that,
3 mol of Na2SO4 produces 1 mole of aluminum sulfate.
1 mole of sodium sulfate = 1/3 mole of aluminum sulfate.
Let x be the number of moles of (Na2SO4) = 1/3 × x = 0.35 mol of aluminum sulfate.
So, x = 1.05 mol × 142 = 149.1g.
Thus, we concluded that the number of grams of sodium sulfate that would be required to produce 120 grams of aluminum sulfate is 149g.
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Jinal kept two glasses of the same size and material on a kitchen table. In one glass she poured 250 mL of hot milk and in the other glass 250 mL of cold milk. She measured the temperature of the milk in both the glasses every ten minutes for two hours. What is she trying to find out?
Explanation:
is there a difference in speed between cooling down and warming up ?
so, when will both reach room temperature ? relatively at the same rate (I assume the hot milk is further from room temperature than the cold milk) ? or maybe even absolutely at the same time ?
Use the chemical reaction to answer the question.
NaHCO3+HC2H3O2→NaC2H3O2+H2O+CO2
A student mixes baking soda (NaHCO3) and acetic acid (HC2H3O2) to produce a chemical reaction shown. Which statement about the reaction is correct?
--------------------------------------------------------------------------------------------------------------------
A. The atoms of the reactants are regrouped during the reaction.
B. Atoms of Na are destroyed during the reaction.
C. There are more H atoms after the reaction.
D.Some atoms gain mass after the reaction.
Answer:
the awnster is A
Explanation:
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A nurse administered 2.70 mL of a radioisotope solution that has an activity of 105 μCi/mL . What total dose of the radioisotope did the patient receive?
Answer:
283.5 of radioisotopes. Each mL has 105 micrograms, so multiply 105 x 2.70.
What does Friar Lawrence do after hearing that Romeo never received his letter in Act V of Romeo and Juliet?
A. Sets off to save Juliet from the tomb
B. Gets to work crafting an antidote for Juliet
C. Runs to find the Nurse to help him
D. Goes searching for Romeo
Answer:
Friar Laurence's plan of action once he realizes Romeo hasn't received his letter is to be their when juliet wakes up and taker her back to his cell until Romeo is told of the plan. Who is the first person to arrive at Juliet's tomb in Scene 3?
determine the mass in grams of each in each of the following
6.00 mol Al
Considering the definition of molar mass, there are 162 grams of Al in 6 moles of Al.
Definition of molar massThe molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Mass of 6 moles of AlYou want to determine the mass in 6 moles of Al. So, being the molar mass of Al is 27 g/mole, you can apply the following rule of three: If by definition of molar mass 1 mole of Al contains 27 grams, 6 moles of Al contains how much mass?
mass= (6 moles× 27 grams) ÷1 mole
mass= 162 grams
In summary, there are 162 grams of Al in 6 moles of Al.
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30 POINTS PLEASE HELP
Explain how the water cycle follows the conservation of mass. Use details to support your response.
Answer:
Water cycle follws conservation of mass
Explanation:
Water conservation is the practice of using water efficiently to reduce unnecessary water usage. According to Fresh Water Watch, water conservation is important because fresh clean water is a limited resource, as well as a costly one.
Matter is conserved in the water cycle as water is found on Earth in a fixed amount, and is never added nor removed from the earth or its atmosphere. The earth itself is a closed system, with all matter cycling through but never being created nor destroyed.
EXPLANATION IN DETAIL:
Water is one of the key ingredients to life on Earth. About 75 percent of our planet is covered by water or ice. The water cycle is the endless process that connects all of that water. It joins the Earth’s oceans, land, and atmosphere.
The Earth’s water cycle began about 3.8 billion years ago when rain fell on a cooling Earth, forming the oceans. The rain came from water vapor that escaped the magma in the Earth’s molten core into the atmosphere. Energy from the sun helped power the water cycle and Earth’s gravity kept water in the atmosphere from leaving the planet.
The oceans hold about 97 percent of the water on Earth. About 1.7 percent of Earth’s water is stored in polar ice caps and glaciers. Rivers, lakes, and soil hold approximately 1.7 percent. A tiny fraction—just 0.001 percent—exists in the Earth’s atmosphere as water vapor.
When molecules of water vapor return to liquid or solid form, they create cloud droplets that can fall back to Earth as rain or snow—a process called condensation. Most precipitation lands in the oceans. Precipitation that falls onto land flows into rivers, streams, and lakes. Some of it seeps into the soil where it is held underground as groundwater.
When warmed by the sun, water on the surface of oceans and freshwater bodies evaporates, forming a vapor. Water vapor rises into the atmosphere, where it condenses, forming clouds. It then falls back to the ground as precipitation. Moisture can also enter the atmosphere directly from ice or snow. In a process called sublimation, solid water, such as ice or snow, can transform directly into water vapor without first becoming a liquid.
Answer:
Water cycle follws conservation of mass
Explanation:
A bank roll of 40 coins weighs approximately 0.313 kg. What is the mass in grams of a single coin?
Answer: .007825
Explanation:
.313 / 40 = .007825
a stick of butter weighs 0.25lbs. what is the weight of the stick of butter in milligrams?
A stick of butter weighs 0.25lbs. The weight of the stick of butter in milligrams is 113398.1.
What are milligrams?Milligrams are the measurement quantity that is used to measure a substance in very minute quantities. It is the SI unit of mass. It is equivalent to one thousand grams.
lb is the symbol of a pound. It is used to measure an object in American and British systems of measurement. It is a value of weight.
1 lb = 453592 milligrams
0.25 lbs = 113398.1 milligrams
Therefore, the weight of the stick of butter in milligrams is 113398.1.
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Calculate the relative rate of effusion for the orange to blue spheres. The root-mean-square speed for the orange spheres is 485.0 m/s. The root-mean-square speed for the blue spheres is 384.0 m/s.
The relative rate of effusion for the orange to blue spheres is 1.263.
What is relative rate?Relative rate is defined as the ratio of the incidence rate of disease or death among the group exposed to the incidence rate of disease ox death among the unexposed group.
It is also defined as the rate at any one particular point of time. It can be measured in per second.
Rate of effusion of orange/ Rate of effusion of blue
= [M blue / M orange] ¹/₂
= 485 / 384 = 1.263
Thus, the relative rate of effusion for the orange to blue spheres is 1.263.
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HELP PLEASE!!! i dont know the answer
Answer:
chloroplast
Explanation:
hope this helps!
Explanation:
number 5 have nucleus....
changed answer=chloroplast
Does baking a loaf of bread conserve mass
The baking of bread follows the law of conservation of mass. Baking is an irreversible chemical change in which chemical substances- Ethanol and Carbon dioxide are formed.
During baking the dough loses weight during cooling. The total percentage loss is around 13%.Mass of the bread is also lost as steam. Carbon dioxide is also formed due to yeast, which converts the sugar. But the volume of the bread doubles. The steam puffs up the bread, giving it high hydration. After the bread is baked, the puffiness is reduced which makes the bread fluffy and light.
Therefore, baking is a chemical change, occurring through the process of fermentation, which includes a series of steps to make a bread in which carbon dioxide rises the dough which eventually settles after cooling.
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A piece of metal has a mass of 114g and a volume of 10.0 cm³. What is the density of the metal?
Answer:
14.4g/cm³
Explanation:
114/10=14.4g/cm³
write down any two effect of heat.
Answer:
1) Raises the temperature. 2) Increases volume.
A certain protein was found to contain 0.793% zinc by mass. Determine the minimum molecular mass of the protein.
A certain protein was found to contain 0.793% zinc by mass. The minimum molecular mass of the protein is 8264.46 grams.
What is molecular mass?Molecular mass is the sum of the all atoms of an element. The molecular mass can be calculated by checking the mass of the atom from the periodic table.
In 100 grams of proteins, we have, 0.793% zinc
The molar mass of zinc is 65.3820 g/mol
0.793 / 65.3820 = 0.0121 moles of zinc
So, in 100 grams of protein
1 mole = 100 / 0.0121 = 8264.46 grams / mol
Thus, the minimum molecular mass of the protein is 8264.46 grams.
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students look out a window for 5 min. they record the number of vehicles that pass, the type of vehicle (car, pickup, truck, motorcycle, and so on) and the color of the venhicle. what are the students doing? A. concluding B. experimenting C. predicting D. observing ,and explain
If the students look out a window for 5 min. and record the number of vehicles that pass, the type of vehicle and color of the vehicle, then the students are observing (Option D is correct).
What is the scientific method?The scientific method is a series of sequential steps by which we can collect empirical evidence about a scientific question, and it involves observation and experimentation.
In conclusion, If the students look out a window for 5 min. and record the number of vehicles that pass, the type of vehicle and color of the vehicle, then the students are observing (Option D is correct).
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How is the weighted average atomic mass of an element calculated?
and
How is the atomic number (Z) determined for an isotope?
Perform the calculation and record the answer with the correct number of sig figs
Answer:
0.399
Explanation:
Sig Fig rules
Name an element in the second period (row) of the periodic table with six 2p electrons
Answer:
arsenic
Explanation:
So basically it can be seen that the element is arsenic. Yeah. And now we see the element which has 6, 2 p electrons and lies in the 2nd period. So that is basically now because if we observe the electronic configuration of now it has atomic number 10 and its electronic configuration is one has to to s to two P six.
A word problem tells you that you have 27.8 moles of carbon dioxide. It asks how
much that is in grams of carbon dioxide.
Luckily, they also supply a conversion factor.
1 mole of carbon dioxide is equal to 44 grams of carbon dioxide.
You set up a conversion equation in the format shown in the image.
What would you
write in the space labeled 'A' in the diagram.
44 grams of carbon dioxide
1 mole of carbon dioxide
27.8 moles of carbon dioxide
we need to cancel the units
b/c would be equal to 1 to retain the same amount, remember, 1a=a
so
b/c=1mol/44g or 44g/1mol
alrighty
we waant to convert 27.8mols
so therefor a=27.8mol
27.8mol times b/c=D
we want c to be mols and b to be grams so the mols cancel
so thefor c=1mol
it would look like this:
I would write 1 mol of carbon dioxide for C (choice A)
In Chemistry we look at the composition and the blank of matter
Answer:
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds.
How many electrons can be described by the same set of 4 quantum numbers?
A.
1
B.
2
C.
4
D.
8
Answer:
only 1 according to pauli no 2 electron have same set of quantum number
answer is A 1
Explanation:
according to pauli no 2 electron have same set of quantum number
The boiling point of a 0.21 m solution of CaSO4 in water is ___________°C.
The Kb of water is 0.512°C/m.
The boiling point of a 0.21 M solution of CaSO₄ in water is 0.107 °C.
For a dilute solution,
molarity ≅ molality
Molarity is approximately equal to the molality.
The elevation in the boiling point is a phenomenon that the boiling point of any liquid will be higher if any other compound is added to it. It depicts that a solution has higher boiling point than that of a solvent.
ΔTb = i x Kb x m
where,
ΔTb = Boiling point elevation
i = Van't Hoff factor
Kb = Molal boiling point constant
m = Molality of solution
Van't Hoff factor is measurement of effect of solute. It is a ratio of concentration of particles to concentration of substance.
Here, i = 1, as CaSO₄ does not dissociate into ions in water.
Given data -
Kb = 0.512°C/m
m = 0.21 m
i = 1
Putting the values,
ΔTb = 1 x 0.512 x 0.21
ΔTb = 0.107°C
Hence,
The boiling point of CaSO₄ is 0.107 °C
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