Answer:
66.5753 amu
Explanation:
From the question given above, the following data were obtained:
Isotope A (⁶⁵X):
Mass of A = 65.0457 amu
Abundance of A = 20.53%
Isotope B (⁶⁷X):
Mass of B = 66.9704 amu
Abundance of B = 79.47%
Atomic mass of X =?
The atomic mass of X can be obtained as follow:
Atomic mass = [(mass of A × A%)/100] + [(mass of B × B%)/100]
= [(65.0457 × 20.53)/100] + [(66.9704 × 79.47)/100]
= 13.3539 + 53.2214
= 66.5753 amu
Therefore, the atomic mass of X is 66.5753 amu.
Element X, with an atomic mass of 66.58 amu, has 2 naturally occurring isotopes, ⁶⁵X (65.0457 amu, 20.53%) and ⁶⁷X (66.9704 amu, 79.47%).
What is the average atomic mass?The average atomic mass (atomic mass) of an element is the sum of the masses of its isotopes, each multiplied by its natural abundance.
Element X has 2 isotopes:
⁶⁵X with an isotopic mass of 65.0457 amu and an abundance of 20.53% (0.2053).⁶⁷X with an isotopic mass of 66.9704 amu and an abundance of 79.47% (0.7947).We can calculate the average atomic mass of X using the following expression.
mX = m⁶⁵X × ab⁶⁵X + m⁶⁷X × ab⁶⁷X
mX = 65.0457 amu × 0.2053 + 66.9704 amu × 0.7947
mX = 66.58 amu
Element X, with an atomic mass of 66.58 amu, has 2 naturally occurring isotopes, ⁶⁵X (65.0457 amu, 20.53%) and ⁶⁷X (66.9704 amu, 79.47%).
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WHAT IS THE ABILITY OF A SUBSTANCE TO BE DISSOLVED
Answer:
Solubility
Explanation:
1 poin
12. Which scientist said that electrons exist in discrete energy levels?
A. Thomson
B. Rutherford
C. Bohr
D. Dalton
Answer:
The answer is thomson
Explanation: he is the one that said it first and then after they tried to take credit but thomson is the correct answer.
***Question in photo***
Is the entropy positive or negative in this question?
Answer:
Enthalpy change is negative
Entropy change is Positive
Explanation:
Pls help thank you I really need
Answer:
A
Explanation:
Answer:
30 mph
Explanation:
Which of the following converts mechanical energy to electrical energy?
O A. An electric generator
O B. A loudspeaker
O C. An electromagnet
O D. An electric motor
Answer:
an electrical generator
Please help me thanks so much....I’ll mark you?!?!:)))) ( 15 points)
Answer:
A physical change has taken place
Answer:
If a substance changes color after being reacted with another substance, it means a chemical reaction has taken place.
Explanation:
A physical change is a change in the form, such as Ice Cream melting, or an Ice Cube melting.
An example of two class b fuels would be
Calculate the moles of solid sulfur
Answer:
32.065 g
Explanation:
molecular weight of Sulfur or grams The molecular formula for Sulfur is S. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Sulfur, or 32.065 grams.
A mole of a substance has a mass in grams that is equal to the molecular mass. For example, a carbon atom has a mass of 12.01 u. A mole of carbon has a mass of 12.01 g. Based on their molar masses, list the GFM of each substance.
Answer:
hello your question is incomplete attached below is the complete question
answer :
Fe2O3 = 159 g/mol
CO = 28.01 g/mol
Fe = 55.85 g/mol
CO2 = 44.01 g/mol
Explanation:
Molar mass for Fe2O3Fe = 55.85 g/mol
O = 16.0 g/mol
hence the molar mass of Fe2O3 = 2(55.85) + 3(16) = 159 g/mol
Molar mass for COC = 12.01 g/mol
O = 16.0 g/mol
hence the molar mass of CO = 28.01 g/mol
Molar mass for FeFe = 55.85 g/mol
Molar mass for CO2C = 12.01 g/mol
O = 16.0 g/mol
hence the molar mass of CO2 = 12.01 + 2(16) = 44.01 g/mol
Answer:
There ya go ;)
Explanation:
I need help on these chemistry problems
Answer:
15. 2.5 M
16. 2.5 moles
17. 0.128 M
18. 56 g
Explanation:
15. Determination of the molarity of NaOH.
Mole of NaOH = 2.5 moles
Volume = 1 L
Molarity =?
Molarity = mole /Volume
Molarity of NaOH = 2.5 / 1
Molarity of NaOH = 2.5 M
16. Determination of the number of mole of solute.
Volume = 1 L
Molarity = 2.5 M
Mole of HCl =?
Molarity = mole /Volume
2.5 = mole of HCl /1
Mole of HCl = 2.5 moles.
17. Determination of the molarity of Na₂S
We'll begin by calculating the number of mole in 20 g of Na₂S. This can be obtained as follow:
Mass of Na₂S = 20 g
Molar mass of Na₂S = (23×2) + 32
= 46 + 32
= 78 g/mol
Mole of Na₂S =?
Molar = mass / molar mass
Mole of Na₂S = 20 / 78
Mole of Na₂S = 0.256 mole
Finally, we shall determine the molarity of Na₂S. This can be obtained as follow:
Mole of Na₂S = 0.256 mole
Volume = 2 L
Molarity of Na₂S =?
Molarity = mole /Volume
Molarity of Na₂S = 0.256 / 2
Molarity of Na₂S = 0.128 M
18. Determination of the mass of solute.
We'll begin by calculating the number of mole solute (CH₄) in the solution. This can be obtained as follow:
Volume = 1 L
Molarity of CH₄ = 3.5 M
Mole of CH₄ =?
Molarity = mole / Volume
3.5 = mole of CH₄ / 1
Mole of CH₄ = 3.5 moles
Finally, we shall determine the mass of the solute (CH₄). This can be obtained as follow:
Mole of CH₄ = 3.5 moles
Molar mass of CH₄ = 12 + (4×1)
= 12 + 4
= 16 g/mol
Mass of CH₄ =?
Mole = mass /Molar mass
3.5 = Mass of CH₄ / 16
Cross multiply
Mass of CH₄ = 3.5 × 16
Mass of CH₄ = 56 g
Which of these has the most potential electrical energy?
Answer:
d beacuse it uses lots of electricity
Which of the complexes or complex ions has geometric (cis or trans) isomers?a. [Pt(NH3)2Cl2] (square planar)b. [Cr(NH3)4Cl2]+ c. [Cr(NH3)5Cl]2+ d. [Co(NH3)2Cl2]2− (tetrahedral)
Answer:
Explanation:
Out of four given compounds , two will show cis-trans isomerism .
They are as follows ,
[Pt(NH₃)₂Cl₂]
and
[Cr(NH₃)₄Cl₂]+
see the attached file.
A4.5 g metal sample decreases in temperature from 48°C to 25°C when 68.5
of heat is removed from it. Calculate the specific heat capacity of the metal.
Answer:
[tex]C=0.662\frac{J}{g\°C}[/tex]
Explanation:
Hello!
In this case, since the heat removal when cooling down a body is computed via:
[tex]Q=mC\Delta T[/tex]
Given the removed heat, mass and temperature change, we solve for the heat capacity of the metal as shown below:
[tex]C=\frac{Q}{m\Delta T}[/tex]
Thus, by plugging in we obtain:
[tex]C=\frac{-68.5J}{4.5g*(25-48)\°C} \\\\C=0.662\frac{J}{g\°C}[/tex]
Best regards!
A nonmetal in the third period that should have chemical properties similar to oxygen.
Answer:
Sulfur
Explanation:
A non-metal in the third period that should have chemical properties similar to oxygen is sulfur.
This is because elements in the same group/family have similar chemical properties.
Chemical properties is predicated on the number of valence electrons within an atom. The number of valence electrons is the number of outermost shell electrons within an atom. Elements combines with one another using these valence shell electrons. Since sulfur is in the third period and the same vertical group as oxygen, they have similar chemical properties.can u pls help me with this question
Answer:
The answer is Condensation which is water vapor in the air changes inot liquid water
is the coil of a wire a magnet
Answer:
No necessarily it depends on if current is flowing through it.
Select the correct answer.
Carbon burns in the presence of oxygen to give carbon dioxide. Which chemical equation describes this reaction?
А. carbon + oxygen + carbon dioxide
B. carbon + oxygen carbon dioxide
C. carbon dioxide - carbon + oxygen
D. carbon dioxide + carbon - oxygen
Basically, carbon (C2) burns in the presence of adequate Oxygen (O2) to form carbon dioxide. Carbon is Quadro valent and is able to accept four more electrons. Oxygen has two electrons and hence, readily reacts with carbon to help break and make bonds. The chemical equation of carbon dioxide (CO2) is
carbon + oxygen → carbon dioxide or C2 + O2 = CO2
Answer:
C
Explanation:
Because it is the question that represents than carbon in the presence of oxygen give carbon dioxide.
Most sulfide compounds of the transition metals are insoluble in water. Many of these metal sulfides have striking and characteristic colors by which we can identify them. Therefore, in the analysis of mixtures of metal ions, it is very common to precipitate the metal ions by using dihydrogen sulfate (commonly called hydrogen sulfide), H2S. Suppose you had a mixture of Fe2+, Cr3+, and Ni2+. Complete the net ionic equations for the precipitation of these metal ions by the use of H2S. (Type your answers using the format Fe2+ for Fe2+.)
Answer:
See explanation
Explanation:
For Fe;
Fe2+(aq) + 2H+(aq) + S2-(aq) ----> FeS(s) + H2(g)
For Ni
Ni2+(aq) + 2H+(aq) + S2-(aq) ----> NiS(s) + H2(g)
For Cr
2Cr3+(aq) + 6H+(aq) + 3S2-(aq) ----->Cr2S3(s) + 3H2(g)
We must remember that in writing these equations, the number of electrons lost or gained must be balanced. The number of electrons lost by the metal must equal the number of electrons gained by hydrogen. This rule was followed in writing all the equations above.
explain how density can be used as a conversion factor to convert the volume of an object to the mass of the object, and vice versa
Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3
What is density?
Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3
In above statement we can understand that density, mass, and volume all are convert to each other it means that if we know any two variable then third one will be calculated easily.
Mathematically,
Formula for density will be as mentioned below:-
Density = Mass/Volume.
From above formula we can calculate mass which is as follows:-
Mass = Volume × Density.
S.I unit of mass is kilograms and C.G.S unit is gram.
And similarly we can calculate the volume which is equal to as follows:-
Volume = mass / density.
S.I unit of volume is meter cube and C.G.S unit is cubic centimeter.
So, we can say that mass, volume and density all are dependent to each other and if any two is known we can easily calculate the third one.
Therefore, Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3.
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When 551. mg of a certain molecular compound X are dissolved in 100 g of benzonitrile (CH,CN), the freezing point of the solution is measured to be 13.4 °C. Calculate the molar mass of X.
Answer:
1.12g/mol
Explanation:
The freezing point depression of a solvent for the addition of a solute follows the equation:
ΔT = Kf*m*i
Where ΔT is change in temperature (Benzonitrile freezing point: -12.82°C; Freezing point solution: 13.4°C)
ΔT = 13.4°C - (-12.82) = 26.22°C
m is molality of the solution
Kf is freezing point depression constant of benzonitrile (5.35°Ckgmol⁻¹)
And i is Van't Hoff factor (1 for all solutes in benzonitrile)
Replacing:
26.22°C = 5.35°Ckgmol⁻¹*m*1
4.90mol/kg = molality of the compound X
As the mass of the solvent is 100g = 0.100kg:
4.9mol/kg * 0.100kg = 0.490moles
There are 0.490 moles of X in 551mg = 0.551g, the molar mass (Ratio of grams and moles) is:
0.551g / 0.490mol
= 1.12g/mol
This result has no sense but is the result by using the freezing point of the solution = 13.4°C. Has more sense a value of -13.4°C.
the diagram below represents the electromagnetic spectrum with some of the regions labeled with letters. Visble light is represented by which letter?
Answer:D
Explanation:
A sample of carbon monoxide gas occupies 3.20 L at
125 °C. At what temperature will the gas occupy a
volume of 1.54 L if the pressure remains constant?
The final temperature : 191.54 K = -81.46 °C
Further explanationGiven
V₁=3.2 L
T₁ = 125 +273 = 398 K
V₂=1.54 L
Required
The final temperature(T₂)
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
T₂=(V₂T₁)/V₁
T₂=(1.54 x 398)/3.2
T₂=191.54 K = -81.46 °C
A sample of sodium hydroxide (NaOH) has a mass of 160.0 g. The molar mass of NaOH is 40.00 g/mol. How many moles of NaOH does this sample contain?
4.000
40.00
160.0
6,400
Answer:
4.000 (A)
Explanation:
what are two ways minerals fom? pause time 2:23
Can strings be deformed?
Answer:
yeah why?
Explanation:
A drawback of the space shuttle was
Answer:
The space shuttle was the result of committee compromise and political expediency. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).
Explanation:
Answer:
The space shuttle was the result of committee compromise and political expediency. In 1990 Scientists decided to launch the space shuttle. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).
The amount of one substance in a certain volume of another substance is its
a.
concentration.
b.
coagulation.
c.
filtration.
d.
irrigation.
Please select the best answer from the choices provided
A
B
C
D
q
Quick plz
Answer:
Concentration
Explanation:
Quizlet
What is the mass of 8.50 × 1022 molecules of NH3?
Answer:
The mass of 8.50 × 10²² NH₃ molecules is ≈ 1.84 g.
One mole of a molecule contains 6.02 × 10²³ molecules. The mass of 8.50 × 10²² molecules of NH₃ is 2.39 g.
What is ammonia (NH3)?Ammonia is an inorganic compound formed by hydrogen and nitrogen. Ammonia exists in gaseous state.
One mole of every element or compound contains 6.02 × 10²³ molecules. This number is called Avogadro number. The molar mass of ammonia is 17 g/l
It is given that the number of molecules of ammonia here, is 8.50 × 10²².
The no.of moles of ammonia = 8.50 × 10²²/ 6.02 × 10²³
= 0.141 moles.
If one mole ammonia is 17 g/l, the mass of 0.141 moles of NH₃ is calculated as follows: 0.141 × 17 = 2.39 g. Hence the mass of NH3 which contains 8.50 × 10²² molecules is 2.39 g.
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Determine the Density of a mass = 2000g and volume = 80ml
Answer:
Explanation:
D = m/v
D = 2000/80 = 25
The formula for a buffer solution contains 1.24% w/v of boric acid. How many milliliters of a 5% w/v boric acid solution should be used to obtain the boric acid needed in preparing 1 L of the buffer solution
Answer:
248 mL of 5% w/v boric acid solution should be used to obtain the solution needed.
Explanation:
We can calculate the volume of the 5% w/v boric acid solution needed to prepare the buffer solution 1.24% w/v using the following equation:
[tex] C_{i}V_{i} = C_{f}V_{f} [/tex]
Where:
[tex]C_{i}[/tex]: is the concentration of the initial solution = 5% w/v
[tex]C_{f}[/tex]: is the concentration of the final solution = 1.24% w/v
[tex]V_{i}[/tex]: is the volume of the initial solution =?
[tex]V_{f}[/tex]: is the volume of the final solution = 1 L
Hence, the volume of the 5% solution is:
[tex] V_{i} = \frac{C_{f}V_{f}}{C_{i}} = \frac{1.24 \%*1 L}{5 \%} = 0.248 L = 248 mL [/tex]
Therefore, 248 mL of 5% w/v boric acid solution should be used to obtain the solution needed.
I hope it helps you!
