If the abundance of 85 Rb is 72.2% and the abundance of 87 Rb is 27.8%, what is the average atomic mass of rubidium?
The average atomic mass of Rubidium : 85.556 u
Further explanationIsotopes are atoms that have the same atomic number but different mass numbers
Each isotope has an abundance which is usually expressed as a percentage
The average relative mass of atoms is obtained by adding the product of the percentage and mass of each isotope
Can be formulated:
[tex]\tt Average~Mass~atom~X=mass~isotope~ 1\times \%1+mass~isotope~2\times \%2+..[/tex]
The abundance of 85 Rb is 72.2% and the abundance of 87 Rb is 27.8%, so
mass isotope 1=85, %abundance=72.2
mass isotope 2=87, %abundance=27.8
The averages atomic mass of Rubidium :
[tex]\tt average~atomic~mass=85\times 0.722+87\times 0.278\\\\average~atomic~mass=61.37+24.186\\\\average~atomic~mass=\boxed{\bold{85.556~u}}[/tex]
What type of energy drives the turbines that produce electricity from water?
Answer:
Wind energy
Explanation:
Answer: Wind energy
Explanation:
I
4. Sonic the Hedgehog weighs 3 kg and accelerates at a rate of 300 m/s2.
What is the force that Sonic will apply when he runs into a wall?
Answer:
how the heck did you think of a question like this
Explanation:
Which of the following is soluble in water at 25 °C?
Fe(NO3)2
FeCO3
Fe(OH)2
Fes
Fe3(PO4)2
Answer:
Fe(NO3)2
Explanation:
Out of all the options, the compound that can be dissolved in water is Fe(NO₃)₃.
Fe(NO₃)₃ or Iron Nitrate is capable of being dissolved in water at 25°C. This is in line with its properties as a nitrate because most nitrates are soluble in water at room temperature.
Other properties and uses of Nitrates include:
Contain nitrogen and oxygen Useful in checking water quality Useful in fertilizerIn conclusion, Iron Nitrate is soluble in water at the room temperature of 25°C.
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Write the balanced chemical equation for the standard enthalpy of formation of P4O10(s). Be sure to include the phases
Answer:
4 P(s, white) + 5 O₂(g) ⇒ P₄O₁₀(s)
Explanation:
The standard enthalpy of formation of P₄O₁₀(s) is the energy required to synthesize 1 mol of P₄O₁₀(s) from the simple substances in their most stable form. The corresponding balanced chemical equation is:
4 P(s, white) + 5 O₂(g) ⇒ P₄O₁₀(s)
P(s, white) is the most stable allotropic form of phosphorus. The standard enthalpy of formation of P₄O₁₀(s) is -2984 kJ/mol.
Here’s another one guys please help.
Answer:
Explanation:
i think B im not sure
true or false The atoms in Container A are hydrogen atoms. Hydrogen is a gas. The atoms placed in containers E, F, G, and H will fill the same volume as the volume of Container A.
Answer:
False
Explanation:
How long did it take a bike to travel 20 miles in 12.5 mph?
Answer:
2 hours and 4 mins
In the periodic table, similar acting items are found in
A. Vertical columns of groups
B. Horizontal rows of periods
C. Both rows and columns
D. Alphabetical order
How could you draw a model of the element copper to show that it is different from the element gold?
please help me hope you understand helllllllpppppppppppppppppp meeeeeeeeee
use the periodic table the atomic number of copper is 29 so neutral copper atoms have 29 protons and 29 electrons to estimate the number of neutrons in the atom round the atomic mass to 64 and subtract the atomic number the atomic number is the number of protons. do the same thing for gold and u have your atomic models for each.
If you have 54.63g of TiCl4, determine the theoretical yield of TiO2.
480.90g TiO2
480.90g TiO, 2
23.00 g TiO2
23.00 g TiO, 2
30.06g TiO2
30.06g TiO, 2
1.11g TiO2
1.11g TiO, 2
Answer:
its D:)
Explanation:
whats the atomic number of Al
....................................................dont have to answer this. cant answer anymore questions hope everyone has an amazing day
Answer:
13
Explanation:
is the atomic number of AI
What color do acids turn litmus paper?
pink
red
yellow
blue
Answer:
Blue- I took the test
Explanation:
How many molecules are in 3 grams of NO2?
Answer:
0.06520959450500399
Explanation:
Answer:
46.0055
Explanation:
Calculate the mass percent composition of carbon
in
C3H4
Answer: 90%
Explanation:
So we need to find the molar mass of the entire compound, and the mass of carbon times the number of molecules:
Molar mass: 3*12 + 4*1 = 40
Mass of carbon: 12*3 = 36
36/40 * 100 = 9/10 * 100 = 90%
what is the molar mass of potassium
permanganate in amu?
Answer:
158.033944 g/mol
Explanation:
Please help! sacrificing my points for this...
which process directly results of this picture?
A.Water erosion
B. Water deposition
C. Wind erosion
D.Wind Deposition.
Answer:
I think it's B
Explanation:
Well I'm pretty sure it's not C or D. And A is detachment or removal of soil by water, And the picture doesn't look like that. So the only explanation is B
Answer:
I go for B.
Explanation:
True or False:
Carbon forms an incredible variety of substances
because it has eight valence electrons making it a
very stable atom that readily bonds.
Answer:
true i think but dont take my word for it.✌
According to the electronic configuration, carbon has 4 valence electrons that makes it a very stable atom that readily bonds.
What is electronic configuration?Electronic configuration is defined as the distribution of electrons which are present in an atom or molecule in atomic or molecular orbitals.It describes how each electron moves independently in an orbital.
Knowledge of electronic configuration is necessary for understanding the structure of periodic table.It helps in understanding the chemical properties of elements.
Elements undergo chemical reactions in order to achieve stability. Main group elements obey the octet rule in their electronic configuration while the transition elements follow the 18 electron rule. Noble elements have valence shell complete in ground state and hence are said to be stable.
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What is the oxidation state of P in PO43-?
O A. +8
O B. +3
O C. +5
OD. +2
Answer:
the answer is +5
Explanation:
good luck :)
A compound is a substance made up of 2 or more _____.
A compound is a substance made up of 2 or more elements
WILL GIVE BRAINLIEST: PLEASEEE HELP
A student has two beakers of water, one at 25°C and one at 63°C. If they are both mixed together into a larger beaker, how will thermal energy transfer between the molecules of the two glasses of water?
a .Thermal energy will move from the water at 63°C to the water at 25°C.
b. Thermal energy will move back and forth between the systems regardless of temperature.
c. Thermal energy will move from the water at 25°C to the water at 63°C.
d. Thermal energy will not move between the systems.
Answer:
a because hot moves to cold
Explanation:
The diagram shows different forms of thermal energy transfer.
Which process is making the pot's handle hot?
Answer:
Conduction
Explanation:
The handle is touching the pot.
And I got it wrong
__________ are composed of two or more covalently bonded atoms.
a). elements
b)molecules
Assume that only non-metals are involved in the formation of the following compound, containing: containing: - one atom belonging to an element in group 14 and - two atoms belonging to an element in group 1 and - one atom belonging to an element in group 16. What is the molecular shape of this compound according to the VSEPR model? A. linear B. trigonal pyramidal C. square planar D. trigonal planar E. tetrahedral bent
Answer:
Option D.
Explanation:
The correct answer is option D that is Trigonal planar because of the data or following information given from the question;
=> "one atom belonging to an element in group 14".
This means that one atom has a lesser electronegativity. And this atom will be the central atom (reason: central atoms have less electronegativity).
=>" two atoms belonging to an element in group 1"
One of the characteristics of group one is it ability to form only one bond, here we will be considering the number of bonds which is one.
=>" one atom belonging to an element in group 16."
Here, we have two bonds.
Thus ,the molecules has one single bonds for each atoms and one double bonds for the last description. We have 3 atoms bonded at 120° each to the central atom.
Is tissue a element or compound
Answer:
compound
Explanation:
PLEASE HELP!!!!
If 9.30 g of potassium reacts with 2.50 g of O2 to form K2O , what is the limiting reagent and what is the theoretical yield of the reaction?
Hint: write the balanced reaction
K - 39.10 g/mol
O - 15.999 g/mol
ANSWER CHOICES:
A.) O2 is limiting, 11.2 g of K2O formed
B.) K is limiting, 14.7 g of K2O formed
C.) K is limiting, 11.2 g of K2O formed
D.) O2 is limiting, 14.7 g of K2O formed
E.) O2 is limiting, 19.2 g of K2O formed
Answer: C.) K is limiting, 11.2 g of [tex]K_2O[/tex] formed
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Putting in the values we get:
[tex]\text{Number of moles of potassium}=\frac{9.30g}{39.10g/mol}=0.238moles[/tex]
[tex]\text{Number of moles of oxygen}=\frac{2.50g}{31.99g/mol}=0.0781moles[/tex]
[tex]4K+O_2\rightarrow 2K_2O[/tex]
According to stoichiometry :
4 moles of [tex]K[/tex] require 1 mole of [tex]O_2[/tex]
Thus 0.238 moles of [tex]K[/tex] will require=[tex]\frac{1}{4}\times 0.238=0.0595moles[/tex] of [tex]O_2[/tex]
Thus [tex]K[/tex] is the limiting reagent as it limits the formation of product and [tex]O_2[/tex] is the excess reagent.
As 4 moles of [tex]K[/tex] give = 2 moles of [tex]K_2O[/tex]
Thus 0.238 moles of [tex]K[/tex] will give =[tex]\frac{2}{4}\times 0.238=0.119moles[/tex] of [tex]AgCl[/tex]
Mass of [tex]K_2O=moles\times {\text {Molar mass}}=0.119moles\times 94.2g/mol=11.2g[/tex]
Thus K is limiting and 11.2 g of [tex]K_2O[/tex] will be formed.
Perform the following operation
and express the answer in
scientific notation.
5.0x10-5 +2.0x10-4
Answer:
[tex]2.5[/tex] × [tex]10^{-4}[/tex]
Explanation:
[tex]5+10^{-5} + 2[/tex] × [tex]10^{-4} = 0.5[/tex] × [tex]10^{-4} + 2[/tex] × [tex]10^{-4}[/tex]
[tex]0.5[/tex] × [tex]10^{-4} + 2[/tex] × [tex]10^{-4}[/tex] = [tex]2.5[/tex] × [tex]10^{-4}[/tex]
In the provided issue, the scientific notation-expressed integers 5.0x10-5 and 2.0x10-4 are added, and the solution is 2.5x10^-4.
Thus, first transform the smaller integer to have the same exponent as the larger number in order to complete the addition. In this situation, by shifting the decimal point one position to the right, we rewrite 5.0x10-5 as 0.5x10-4.
The outcome of adding the numbers together is 2.5. Finally, we use the common exponent—in this example, -4—to express the result in scientific notation. The final solution is 2.5x10^-4 as a result. Therefore, by adjusting the exponent and adding the numbers, the final solution, 2.5x10^-4 is obtained.
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In what order do electrons fill orbitals?
A. Before pairing, 1 electron occupies each s and p orbital.
B. Electrons fill orbitals in order of increasing orbital energy.
C. Orbitals s, p, and then d fill in one energy level before starting the
next level.
D. The p orbitals fill before the s orbitals in an energy level.
SUBM
Answer:B electrons fill orbitals In order of their increasing energy from left to right
Explanation:
0.415 g of an unknown triprotic acid are used to make a 100.00 mL solution. Then 25.00 mL of this solution is transferred to an Erlenmeyer flask and is titrated with 0.1029 M NaOH. The initial burette reading is 1.81 mL; when the titration endpoint is reached, the final burette reading is 39.70 mL. How many moles of triprotic acid are neutralized during the titration? Provide your answer in decimal form (e.g. 0.123) to the correct number of significant figures.
Answer:
Explanation:
Initial burette reading = 1.81 mL
final burette reading = 39.7 mL
volume of NaOH used = 39.7 - 1.81 = 37.89 mL .
37.89 mL of .1029 M NaOH is used to neutralise triprotic acid
No of moles contained by 37.89 mL of .1029 M NaOH
= .03789 x .1029 moles
= 3.89 x 10⁻³ moles
Since acid is triprotic , its equivalent weight = molecular weight / 3
No of moles of triprotic acid = 3.89 x 10⁻³ / 3
= 1.30 x 10⁻³ moles .
Explain why an element with a large atomic radius won't have a high electronegativity
Explanation:
The larger the radius of an atom, the lesser the electronegativity of the atom. This is because of the screening effect.
Electronegativity of an element is a property that combines the ability of its atom to lose or gain electron. It is mostly expressed as the measure of the relative tendency with which the atoms of the element attract valence electrons in a chemical bond. The larger an atom, the lesser the nuclear charge on the outermost electrons. This weak shielding of these outer shell electrons results in them easily being lost.