Answers
use the formula:
average atomic mass= atomic mass1 × abundance1/100 + atomic mass2 × abundance2/100
62.9296 × 69.15/100 + 64.9278 × 30.85/100=
62.9296 × 0.6915 + 64.9278 × 0.3085=
43.5158 + 20.0302=
63.546 amu
so the answer is 63.546 amu
(the element is europium)
Related Questions
What coefficient would you place in front of O2 in order to balance this chemical equation:
2C2H6 + _?_O2 → 4CO2 + 6H2O
C)8 A) 6 R) 14 B) 7
Answers
Answer:
7 O2
Explanation:
My method involves counting all the elements in the equation. There must be an equal amount of each on both sides. Because it's asking for O2 only, look for compounds that deal with O2
So...CO2 and H2O only on the product side for this chemical equation.
Count the total O there is
CO2 has 2 O in one molecule, so 4 CO2 molecule is 8 Oxygen
H2O has 1 O in one molecule, so 6 H2O molecule is 6 Oxygen.
Your total O on the product side is 14
On the reactant side, the O2 is paired because O2 likes to be stable, so one O2 molecule has 2 O. This means that 2x = 14, which is 7.
Your answer is 7
Answer:
7 O2
Explanation:
You are given the balanced equation 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(ℓ) You are given rules for assigning oxidation numbers in Table 9.3 on page 604 of the student textbook. Compare the oxidation numbers of the atoms of each element on both sides of the equation. ... Therefore, the reaction is a redox reaction.
what does aqueous mean
Answers
of or containing water, typically as a solvent or medium.
"an aqueous solution of potassium permanganate"
like water; watery.
"a great hall of aqueous marble"
A sample of gas at 2.00 atm has a temperature of 60. °C. What will its temperature be at 6.50 atm
Answers
Answer:
https://quizlet.com/259730102/chemistry-unit-10-flash-cards/
Explanation:
How many atoms are in 70.00 grams of oxygen.
Question 2 options:
2.635 x 1024 molecules O
2.635 x 1024 atoms O
6.744 x 10 23 atoms O
6.744 x 1026 atoms O
Answers
Answer:
A. is the correct choice.
Explanation:
If there are 70.00 g of Oxygen then it would be molecules, in which there is only 1 option with molecules.
I am NOT professional. There is a chance I am wrong. Please reply to me if I made a mistake.
Answer:
Explanation:How many atoms are in 70.00 grams of oxygen.
Pls do it I don’t understand
Answers
student A is pulling 57 newtons and student B is pushing at 96 newtons. What is the net force?
Answers
Answer:
153 N left
Hope this helps
Explanation:
What variable(s) determine the amount of kinetic energy an object has?
Answers
Answer:
Mass and speed
Explanation:
Mass and speed determine the amount of kinetic energy an object has. Mass is an intrinsic property of a body.
What is mass?Mass refers to an intrinsic property of a body. It was traditionally believed to be related to the quantity of matter in a physical body, until the discovery of the atom and particle physics. It was found that different atoms and different elementary particles, theoretically with the same amount of matter, have nonetheless different masses.
Mass in modern physics has multiple definitions which are conceptually distinct, but physically equivalent. Mass can be experimentally defined as a measure of the body's inertia, meaning the resistance to acceleration when a net force is applied. The object's mass also determines the strength of its gravitational attraction to other bodies. The SI base unit of mass is the kilogram.
In physics, mass is not the same as weight, even though mass is often determined by measuring the object's weight using a spring scale.
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This is for my wonderful boy friend Putting my defenses up
'Cause I don't wanna fall in love
If I ever did that, I think I'd have a heart attack
Never put my love out on the line
Never said "Yes" to the right guy
Never had trouble getting what I want
But when it comes to you, I'm never good enough
When I don't care, I can play 'em like a Ken doll
Won't wash my hair, then make 'em bounce like a basketball
But you make me wanna act like a girl
Paint my nails and wear high heels, yes, you
Make me so nervous that I just can't hold your hand
You make me glow
But I cover up, won't let it show
So I'm putting my defenses up
'Cause I don't wanna fall in love
If I ever did that, I think I'd have a heart attack
I think I'd have a heart attack
I think I'd have a heart attack
Never break a sweat for the other guys
When you come around, I get paralyzed
And every time I try to be myself
It comes out wrong like a cry for help
It's just not fair; pain's more trouble than love is worth
I gasp for air; it feels so good, but you know it hurts
But you make me wanna act like a girl
Paint my nails and wear perfume for you
Make me so nervous that I just can't hold your hand
You make me glow
But I cover up, won't let it show
So I'm putting my defenses up
'Cause I don't wanna fall in love
If I ever did that, I think I'd have a heart attack
I think I'd have a heart attack
I think I'd have a heart attack
The feelings got lost in my lungs
They're burning I'd rather be numb
And there's no one else to blame
So scared I take off, and I run
I'm flying too close to the sun
And I burst into fla-fla-flames
You make me glow
But I cover up, won't let it show
So I'm putting my defenses up
'Cause I don't wanna fall in love
If I ever did that, I think I'd have a heart attack
I think I'd have a heart attack (Heart attack)
I think I'd have a heart attack
I think I'd have a heart attack
I think I'd have a heart attack
Answers
Answer:
oh thats a bomb song tho i love
Answer: Christina your killing me pls come back i screwed everything up with everyone pls
Explanation: pls
Find the mass of 1.25 moles Ca(OH)2.
Answers
92.5
Explanation
1.25 x 74= 92.5g
According to the mole concept, the mass of 1.25 moles Ca(OH)₂ is 92.61 grams.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.Mass=number of moles×molar mass=1.25×74.09=92.61 g.
Thus,the mass of 1.25 moles Ca(OH)₂ is 92.61 grams.
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PLS HELP I WILL GIVE BRAINLIST.
Mercury has a density of 13.6 g/cm³. Which of these materials will float in mercury? Check all that apply.
iron, density: 7.8 g/cm³
aluminum, density: 2.7 g/cm³
silver, density: 10.5 g/cm³
gold, density: 19.3 g/cm³
uranium, density: 18.7 g/cm³
lead, density: 11.3 g/cm³
Answers
Answer:gold iron and uranium
Explanation:
Answer:
iron, density: 7.8 g/cm³
aluminum, density: 2.7 g/cm³
silver, density: 10.5 g/cm³
lead, density: 11.3 g/cm³
Explanation:
other ones wrong
Na2O +
H20
NaOH
yeah
Answers
Answer:
Na2O + H2O → 2NaOHexplanation:Sodium oxide react with water to produce sodium hydroxide.
Explanation:
Na2O + H20== 2NaOHbalanced equation
Luis is conducting an investigation to determine if modern horseshoe crabs evolved from
extinct organisms call trilobites. Which of the following should Luis use to determine if there is
evidence to support his idea?
a. The fossil record of trilobites
b. The population size of trilobites
c. The traits of all extinct animals
d. The population size of horseshoe crabs
Answers
Answer:
a. The fossil record of trilobites
Explanation:
i just did the quiz
which statement describes the movement of carbon dioxide in the carbon cycle?
Answers
Explain
since in the carbon cycle CO2 goes into plants, creating sugar molecules that the animals then eat and as a result breathe out the CO2 back into the atmosphere
Which arrow or arrows represent reactions that demonstrate a conservation of mass and energy? Explain your answer.
Answers
Answer:
A
Explanation:
I would say A because the sun makes energy right so if you are looking for an arrow or arrows I would say A I hope this helps!! and have a great day or night
Answer:
A and E
Explanation:
the other guy was correct but E also demonstrate a conservation of mass and energy.
What characteristic best describes an astroid A. It’s around a planet and it is larger than the planet B. is much smaller than the paint see it revolves around the sun C. it is much more deadly D on it is the center of the solar system
Answers
What is the overall reaction equation
Answers
Answer:
If m or n is zero, the reaction is zero order in A or B, respectively, and the rate of the reaction is not affected by the concentration of that reactant. The overall reaction order is the sum of the orders with respect to each reactant. If m = 1 and n = 1, the overall order of the reaction is second order
(m + n = 1 + 1 = 2).
Explanation:
2 Tissues working together to perform specialized functions are called
F an organ.
Gan organism.
Ha population.
J a cell.
Answers
Answer:
picture plz
Explanation:
in multicellular organisms groups of cells that work together are called:______.
Answers
Answer:
In multicellular organisms groups of cells that work together are called tissues.
Helppppppppppp it’s due today pls help and thanks
Answers
Step 1: Evaporation
Step 1: condensation
Step 3: Sublimation
Step 4: Precipitation
Step 5: Transpiration
Step 6: Runoff
Step 7: Infiltration
786,091,641 cm to two sig figs
Answers
Answer:
790000000
Explanation:
Distance=100 meters
Time=33.2 seconds
Speed=
pls help
Answers
Answer:
3.01
Explanation:
Speed=distance/time
=100mtrs/33.2sec
=3.01m/s
_is a change in direction or speed
-velocity
-force
-deceleration
-mass
-acceleration
Answers
Why is density a characteristic property of an object, but volume is not?
A. Characteristic properties are not measurable.
B. Characteristic properties do not depend on sample size.
C. Characteristic properties are obtained by combining simple properties.
D. Characteristic properties are affected by the force of gravity.
Answers
What do all things that are made of matter have in common?
Answers
Answer:
The common things among the three states of matter are: They are made up of small tiny particles. They have a particular mass and can occupy space. These three states have volume in it.
Answer:
Matter is any substance that has mass and takes up space. Everything is made of matter, so any object you can name consists of matter. Basically, if it takes up space and has mass, it's matter.
Explanation:
I really hope this helps have a wonderful day
When a bat strikes a ball, the force exerted can send the bat
backwards. The force exerted on the bat is due to Newton's
??????? law.
Answers
Explanation:
Newtons third law.. 100% your answer
C3H8 + 5O2 → 3CO2+ 4H2O, if 5.75L of oxygen are consumed in the above reaction, how many L of carbon dioxide are produced?
Answers
Answer: 3.45 L carbon dioxide are produced
Explanation:
According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.
To calculate the moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given volume}}{\text {Molar volume}}=\frac{5.75L}{22.4L}=0.257moles[/tex]
[tex]C_3H_8+5O_2(g)\rightarrow 3CO_2+4H_2O[/tex]
According to stoichiometry :
5 moles of [tex]O_2[/tex] produce = 3 moles of [tex]CO_2[/tex]
Thus 0.257 moles of [tex]O_2[/tex] will produce=[tex]\frac{3}{5}\times 0.257=0.154moles[/tex] of [tex]CO_2[/tex]
Volume of [tex]CO_2=moles\times {\text {Molar volume}}=0.154moles\times 22.4L/mol=3.45[/tex]
Thus 3.45 L carbon dioxide are produced
helppppppppppppppppppppp
Answers
Answer:
Formation of sedimentary rocks
Explanation:
I believe this is correct, May I get a brainliest???
If on December 1st there is a new moon, when will the next new moon be approximately?
December 14th
December 5th
January 5th
December 29th
Answers
How does salinity vary with freezing and melting?
Question 3 options:
Freezing increases salinity, while melting decreases salinity.
Both freezing and melting decrease salinity.
Freezing decreases salinity, while melting increases salinity.
Both freezing and melting increase salinity.
Answers
Answer:
For every 5 psu increase in salinity, the freezing point decreases by 0.28 degrees Celsius (0.5 degrees Fahrenheit); thus, in polar regions with an ocean salinity of about 32 psu, the water begins to freeze at -1.8 degrees Celsius (28.8 degrees Fahrenheit).
Explanation:
Freezing increases salinity, while melting decreases salinity.
took the test lol
Convert 380 mmHg to atm.
Answers
Answer:
50662.5
Explanation: