Answer:
0.0000101 grams.
Explanation:
First of all, use Avogadro's number to convert from molecules to moles.
Avogadro's number is 6.02 x 10^23.
Second of all, to convert from moles to grams, find the substance formula of phosphorus trichloride. After finding the substance formula, then find the molar mass of phosphorus trichloride.
Phosphorus trichloride is PCl3
Now find the molar mass of PCl3
P = 31.0 amu
Cl = 35.5 amu
They are three chlorine atoms and one phosphorus atom. So you do this.
31.0(1) + 35.5(3) = 137.5 g/mol
Now use dimensional analysis to show your work
4.6 x 10^16 grams of PCl3 * 1 mol/ 6.02 x 10^23 * 137.5 g/mol / 1 mol
The grams and the moles cancel out.
So now do [(4.6 x 10^16) / (6.02 x 10^23)] x 137.5
and you will get 0.000010507
4.6 has the fewest digits which is 2.
So use sig figs and the answer rounds to the nearest millionths.
0.000010507 rounds to 0.0000101
So the final answer is 0.0000101 grams(don't forget the units)
Hope it helped!
Balance the Chemical Equations
Rb + RbNO3---> Rb2O + N2
please help me
Answer:
10Rb° + 2RbNO₃ => 6Rb₂O + N₂
Explanation:
Given: Rb° + RbNO₃ => Rb₂O + N₂
=> 1st balance rubidium in RbNO₃ against Rb₂O by inserting a '2' coefficient before RbNO₃ and a '6' coefficient before Rb₂O
=> Rb° + 2RbNO₃ => 6Rb₂O + N₂ => Oxygen and Nitrogen are balanced. All that remains is balancing Rb by inserting a '10' coefficient.
=> 10Rb° + 2RbNO₃ => 6Rb₂O + N₂
Note: In balancing chemical equations, saving an element that is not part of a compound until last frequently gives balance by inspecting the number of elements of the specific kind and boosting its coefficient to balance the equation.
Balanced equation => 10Rb° + 2RbNO₃ => 6Rb₂O + N₂
The balanced chemical reaction can be of the equation given is [tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex].
We need to make sure that the amount of atoms of each element is the same on both sides of the equation in order to balance the chemical equation [tex]Rb + RbNO_3- > Rb_2O + N_2[/tex].
By counting the atoms in each element, we may begin to balance the equation. We have one Rb, one Rb, one N, and three O atoms on the left side. We have two Rb, one N, and two O atoms on the right side.
We can add a coefficient of 2 in front of [tex]RbNO_3[/tex] to balance the Rb atoms, which gives us:
[tex]2Rb + RbNO_3 - > Rb_2O + N_2[/tex]
Thus, now, the equation is balanced with two Rb atoms on both sides.
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Fossils can be found all over the world, often in layered rock formations. To determine the age of the rock layers within an
area, geologists and paleontologists use a technique called radiometric dating. Determining the age of a rock layer allows
scientists to determine the age of the fossils within it.
Some of the more exciting fossil discoveries are of dinosaurs, which existed on Earth between 230 and 65 million years
ago. Examine this map e. Click the map to zoom in, and drag the magnifying glass for a closer look. The map shows
where prehistoric rocks formed during the Triassic, Jurassic, and Crustaceous time periods, the same periods when
dinosaurs walked on Earth. Based on the map, what is the closest location to you where dinosaurs are likely to have lived?
Answer: Western USA.
Answer:
the answer is the question itself
Explanation:
Thomson's plum pudding model of the atom was most directly replaced or refuted by
a. Rutherford's discovery that atoms contain a nucleus
b. Chadwick's discovery of the neutron
c. Goldstein's discovery of protons
d. Democritus's idea that the atom is indivisible
Answer:
A. Rutherford's discovery that atoms contain a nucleus
Explanation:
Answer:
A is the answer
Explanation:
Meiosis goes through 2 divisions to create four unique haploid cells. true or false
Answer:
True
Explanation:
True is the ANSWER.
Which elements are common to all organisms? Which ones apply??
A.sodium
B.oxygen
C. Sulfur
D. Hydrogen
E. iron
F. phosphorus
Answer:
B D
Explanation:
hope this is right but not entirely sure
what is one example of a electromagnetic wave
Answer:
Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Answer:
Electromagnetic waves can be split into a range of frequencies. This is known as the electromagnetic spectrum. Examples of EM waves are radio waves, microwaves, infrared waves, X-rays, gamma rays, etc.
Explanation:
In two or more complete sentences describe all of the van der Waals forces that exist between molecules of water.
Answer:
Van der Waals forces is defined as the force that include attraction and repulsions between atoms or molecules, and also involve intermolecular forces
Vander Waals force formed between the similar molecules and not different molecules, that means Van der Waals force exist between two water molecules and not between hydrogen and oxygen of one molecule. Hydrogen and oxygen are connected with covalent bonds.
The picture below shows the positions of the Earth, Moon, and Sun during an eclipse.
What is true of the eclipse shown in the picture?
A.
It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
B.
It is a solar eclipse, in which the Earth casts a shadow on the Moon.
C.
It is a lunar eclipse, in which the Moon casts a shadow on the Earth.
D.
It is a solar eclipse, in which the Moon casts a shadow on the Earth.
Answer:
it is option c liner eclipse
Answer:
A-It is a lunar eclipse, in which the Earth casts a shadow on the Moon.
i need help asap!! i will give brainliest
What is the percent by mass of Nitrogen in Mg(NO3)2?
Answer:
18.888%
Explanation:
How do you draw a lewis structure?
Answer:
How to Draw a Lewis Structure.
Step 1: Find the Total Number of Valence Electrons.
Step 2: Find the Number of Electrons Needed to Make the Atoms "Happy".
Step 3: Determine the Number of Bonds in the Molecule.
Step 4: Choose a Central Atom.
Step 5: Draw a Skeletal Structure.
Step 6: Place Electrons Around Outside Atoms.
Explanation:
Hope this helped! :)
idoine would have chemical properties most like ?
How many moles are in 9.07 x 10^23 atoms of sodium chloride?
Answer:
1.5 moles of sodium chloride are present.
Explanation:
Given data:
Number of moles of sodium chloride = ?
Number of atoms of sodium chloride = 9.07×10²³
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ atoms
9.07×10²³ atoms × 1 mol / 6.022 × 10²³ atoms
1.5 moles of sodium chloride are present.
A breeder reactor is one type of nuclear reactor. In a breeder reactor, uranium-238 is transformed in a series of nuclear reactions into plutonium-239.
The plutonium-239 can undergo fission as shown in the equation below. The X represents a missing product in the equation.
Compare the amount of energy released by completely fissioned plutonium-239 to the amount of energy released by the complete combustion of the same amount of coal.
Answer:hope this help
Explanation:
9) Given the reaction: N2(g) + O2(g) + 182.6 kJ → 2 NO(g) What is the heat of formation of nitrogen (II) oxide in kJ/mole? A) AH = -182.6 B) AH = -91.3 C) AH = 91.3 Show D) AH = 182.6
PLEASE HELP please
The heat of formation of nitrogen (II) oxide : +91.3 kJ/mol
Further explanationGiven
Reaction
N2(g) + O2(g) + 182.6 kJ → 2 NO(g)
Required
The heat of formation
Solution
In the above reaction, the heat of the reaction is located on the reactant side which indicates that the formation of nitric oxide requires heat (endothermic reaction).
In the above reaction the heat required to form 2 moles of NO, so the heat required for each mole is:
+182.6 kJ : 2 = =+91.3 kJ/mol
How many atoms of beryllium are equal to 0.39 moles of beryllium?
Answer:
2.35 x 10²³atoms
Explanation:
Given parameters:
Number of moles of Be = 0.39moles
Unknown:
Number of atoms = ?
Solution:
To solve this problem:
1 mole of a substance contains 6.02 x 10²³ atoms
0.39 mole of Be will contain 0.39 x 6.02 x 10²³ = 2.35 x 10²³atoms
How many valence electrons must Calcium lose when forming an ionic compound with Bromine?
Answer:
2
Explanation:
Why do you think the different heating process result in different softness or hardness of the steel? Think about what steel is made of and how the atoms move .
Explanation:
Different heating process affect the microstructure of the steel in different ways. Thus, imparting different properties to the steel. For example, annealing is done is done to impart softness to steel, hardening is done to hardened the steel( eg: carburizing, nitriding, cyaniding) whereas tempering is done to improve the ductility of the steel.
Steel mainly contains iron and carbon. This percentage of carbon and iron decides the property of the steel. It is the % of carbon which is altered in different heating process that to obtained the desire microstructure in steel.
1. How is the atom count for each element on the reactant side of a balanced chemical equation related to the atom count for each element on the product side of the same equation?
Answer: The atom count for each element on the reactant side of a balanced chemical equation is equal to the atom count for each element on the product side of the same equation
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.
In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.
[tex]2H_2+O_2\rightarrow 2H_2O[/tex]
Thus there are 4 atoms of hydrogen on reactant as well as product side.
Also there are 2 atoms of oxygen on reactant as well as product side.
pleas HELP QUICK!!!!!!!!!!!!!!!!!
Answer: first is last second is first and 3rd is second
Explanation:
Which statement describes the motion of the sun?
The sun rotates at the same rate throughout.
The sun does not rotate at its poles.
Different parts of the sun rotate at different rates.
The sun does not rotate at its equator.
Answer: Different parts of the sun rotate at different rates.
Explanation:
The statement that best describes the motion of the sun is that different parts of the sun rotate at different rates.
First and foremost, we should note that the rotation of the sun is on its axis and also the sun isn't a solid. Due to this, its motion will be that there'll be rotation of different part of it at different rates. Assuming the sun was solid, then all of its parts will move together.
Answer:
Different parts of the sun rotate at different rates.
Explanation: pic proof
Which of the following is true about the electron configurations of the noble gases?
A) The highest occupied s and p shells are completely filled.
B) The highest occupied s and p shells are partially filled.
C) The electrons with the highest energy are in a d sublevel.
D) The electrons with the highest energy are in an f sublevel.
Which of the following correctly shows the relationship, in terms of number of particles, of the three substances?
A. 1 mole of water < 1 mole of helium < 1 mole of aluminum
B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
C. 1 mole of aluminum < 1 mole of helium < 1 mole of water
D. 1 mole of helium < 1 mole of aluminum < 1 mole of water
The correct option which shows the relation between particles of the three substances is 1 mole of aluminum = 1 mole of helium = 1 mole of water.
What is a particle?
A particle is a small part of matter.
The term refers to particles of all sizes, ranging from subatomic particles like electrons to visible particles like dust particles floating in sunlight.
The relationship of a number of particles of the substance can be calculated by Avogadro's law
Thus, the correct option is B. 1 mole of aluminum = 1 mole of helium = 1 mole of water
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Increased human population will most likely have which consequence? *
A: decrease global warning
B: increase the use of fossil fuels
C: increase animal habits
D:replenish Fish species in our Ocean
Please help with my homework
Answer:
B its most likely sorry if im wrong :D :(
Explanation:
How does the following equation demonstrate the law of conservation of mass? 22 + 2 → 22
A. The number of atoms of each element is the same on the reactant side as the product side.
B. The number of atoms on the reactant side is more than the number of atoms on the product side.
C. The number of water molecules is the same on the reactant and product side.
D. The number of atoms on the reactant side is less than the number of atoms on product side.
Answer:
A. The number of atoms of each element is the same on the reactant side as the product side.
Explanation:
The equation demonstrates the law of conservation of mass in such a way that the number of atoms of each element is the same on the reactant side as the product side.
According to the law of conservation of mass "matter is neither created nor destroyed in a chemical reaction but they are changed from one form to another".
By virtue of this, the number of moles of atoms on both sides of the expression must be the same.10 While a student is holding a piece of metal in her hand, her hand gets colder. What happens to the temperature of the metal? * m (6 Points) A. The piece of metal will get warmer because some thermal energy is transferred from the metal to the student's hand. B. The piece of metal will get warmer because some thermal energy is transferred from the student's hand to the ON metal. C. The piece of metal will stay at the same temperature because an equal amount of thermal energy is exchanged between the student's hand and the metal. D. The piece of metal will stay at the same temperature because thermal energy is not transferred between the student's hand and the metal.
Answer:
B
Explanation:
thermal energy is the energy between one object to another
BRAINLIEST PLEASEEE HELPLP 5. In a lab experiment, 2.5 grams of sodium bicarbonate is heated and decomposed into
sodium carbonate, carbon dioxide, and water vapor when heated. The actual yield of
sodium carbonate produced in the experiment is 2.04 grams. The theoretical yield of
each product is recorded in the data table below.
Using this data, determine the percent yield for sodium carbonate?
(Round Your Answer to the Nearest Whole Number)
Answer:
Explanation:
Sodium bicarbonate,
NaHCO
3
, will decompose to form sodium carbonate,
Na
2
CO
3
, water, and carbon dioxide,
CO
2
2
NaHCO
3(s]
→
Na
2
CO
3(s]
+
CO
2(g]
+
H
2
O
(g]
Notice that you have a
2
:
1
mole ratio between sodium bicarbonate and sodium carbonate. This means that the reaction will produce half as many moles of the latter than whatever number of moles of the former underwent decomposition.
Use sodium carbonate's molar amss to determine how many moles you'd get in that sample
0.685
g
⋅
1 mole NaHCO
3
84.007
g
=
0.008154 moles NaHCO
3
Now, if the reaction were to have a
100
%
yield, it would produce
0.008154
moles NaHCO
3
⋅
1 mole Na
2
CO
3
2
moles NaHCO
3
=
0.004077 moles Na
2
CO
3
Use the molar mass of sodium carbonate to determine how many grams would contain this many moles
0.004077
moles
⋅
105.99 g
1
mole
=
0.4321 g Na
2
CO
3Sodium bicarbonate,
NaHCO
3
, will decompose to form sodium carbonate,
Na
2
CO
3
, water, and carbon dioxide,
CO
2
2
NaHCO
3(s]
→
Na
2
CO
3(s]
+
CO
2(g]
+
H
2
O
(g]
Notice that you have a
2
:
1
mole ratio between sodium bicarbonate and sodium carbonate. This means that the reaction will produce half as many moles of the latter than whatever number of moles of the former underwent decomposition.
Use sodium carbonate's molar amss to determine how many moles you'd get in that sample
0.685
g
⋅
1 mole NaHCO
3
84.007
g
=
0.008154 moles NaHCO
3
Now, if the reaction were to have a
100
%
yield, it would produce
0.008154
moles NaHCO
3
⋅
1 mole Na
2
CO
3
2
moles NaHCO
3
=
0.004077 moles Na
2
CO
3
Use the molar mass of sodium carbonate to determine how many grams would contain this many moles
0.004077
moles
⋅
105.99 g
1
mole
=
0.4321 g Na
2
CO
3
By using the given data, the percent yield for sodium carbonate (Na₂CO₃) is equal to 127.
How to calculate percent yield?Percent yield of any data can be calculated as:
% yield = (Actual value / Theoretical value) × 100
In the question actual yield of sodium carbonate is given, which is equal to 2.04 grams. And in the table theoretical yield of sodium carbonate also given, which is equal to 1.60 grams.
Now putting these value in the above equation, we get:
% yield = (2.04 / 1.60) × 100 = 127
Hence, percent yield of sodium carbonate (Na₂CO₃) is 127.
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The diagram represents the path of a ball that has been thrown upward. Discuss how the kinetic energy (KE), gravitational potential energy (GPE), and total mechanical energy (ME) change between points A (where the ball is thrown from), B (the highest point reached by the ball), and C (where the ball hits the ground). Ignore friction between the ball and the air. (3 points)
Answer:
Gravitational potential energy: [tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex]
Kinetic energy: [tex]KE_{B}<KE_{A}<KE_{C}[/tex]
Total mechanical energy: [tex]ME_{A}=ME_{B}=ME_{C}[/tex]
Explanation:
The gravitational potential energy is directly proportional to height ([tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex]). Since there are no non-conservative forces, the total mechanical energy is conserved ([tex]ME_{A}=ME_{B}=ME_{C}[/tex]) and the total mechanical energy is the sum of gravitational potential and kinetic energies. Then:
[tex]GPE_{A} + KE_{A} = GPE_{B} + KE_{B} = GPE_{C} + KE_{C}[/tex] (1)
If we know that [tex]GPE_{B}>GPE_{A}>GPE_{C}[/tex], then we conclude the following inequation for the kinetic energy:
[tex]KE_{B}<KE_{A}<KE_{C}[/tex] (2)
Which of the following is NOT a compound?
Table salt
Carbon dioxide
Water
Gold
Answer: Gold.
Explanation: Water, CO2, and table salt are compounds. They are composed of two or more separate elements; a mixture, where as gold is neither.
what volume of a 6.0% W/V glucose (C6H6O6) solution can be prepared using 185g of glucose?
Volume of solution : = 3083.3 ml = 3.0833 L
Further explanationGiven
a 6.0% w/v
185 g of glucose
Required
Volume of solution
Solution
% w/v : the mass of solute in a volume of solution or 1 g solute in 100 ml of solution
Can be formulated :
% w/v = (mass solute(g) : volume solution(ml)) x 100
Mass of solute = mass of glucose = 185 g
The volume of solution :
= 185 g : 0.06
= 3083.3 ml
= 3.0833 L