0.139 moles of plutonium are present in a sample containing 8.4 x 10²² atoms of Pt.
How to calculate number of moles?The number of moles of a substance can be calculated using the following expression:
no of moles = no of molecules ÷ 6.02 × 10²³
According to this question, 8.4 × 10²² atoms of plutonium are present in the molecule of plutonium.
no of moles = 8.4 × 10²² = 6.02 × 10²³
no of moles = 1.39 × 10-¹
no of moles = 0.139moles
Therefore, 0.139 moles of plutonium are present in a sample containing 8.4 x 10²² atoms of Pt.
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What is the lowest energy level that contains d orbitals.
Answer:
3
Explanation
it is 3
PLEASE HELPNIM STUCK
Answer:
I think its C
Explanation: cuz the pictures indicate that is returns to "normal" last.
When a magnet spins within a coil of wires, what is produced?
A. blue sparks
B. glowing light
C. nuclear energy
D. an electric current
and
In an electric generator, ___ will increase the output of electricity.
A. decreasing the turns of wire
B. increasing the turns of wire
C. decreasing the size of the magnet
D. decreasing the speed if the spinning magnet
lastly
Electric field defined as force per charge. It is measured in units of newtons divided by _____.
A. watts
B. coulombs
C. mass
D. grams
thanks :)
how do we compare the PH of a weak acid and a strong acid of identical concentration and draw a conclusion about the concentration of hydrogen ions?
Answer:
This means that the pH values of strong acids are lower than that of weak acids, which explains why the rate of reaction of strong acids with substances (such as metals, metal carbonates etc) is higher than that of weak acids.
Explanation:
welcome
Up late, a tired engineer calculated the molar mass of nitroglycerin (C3H5N3O9) to be 193.7 g/mol, but this incorrect. What is the percent error of this incorrect molar mass
So, the formula mass of nitroglycerin is[tex]3(12.011)+5(1.00794)+3(14.0007)+9(15.9994)=227.0694 \text{ g/mol}}[/tex]
Therefore, the percent error is
[tex]\frac{193.7-227.0694}{227.0694} \times 100=\boxed{-14.70 \% \text{ (to 4 sf)}}[/tex]
The density of lead is 11.3 g/mL. What is the mass of 45 mL of the metal?
Answer:
510g
Explanation:
45mL..
1mL
_____ = 510g
11.3g
Which feature of a balanced chemical equation demonstrates the law of conservation of mass?
Answer:
A balanced equation demonstrates the conservation of mass by having the same number of each type of atom on both sides of the arrow.
Explain how the moon causes high and low tides.
Answer:
gravitational pull generates something called tidal force.
Explanation:
High and low tides are caused by the moon. the moons gravitational pull generates tidal force.
Cyclohexene oxidation with potassium permanganate gives three different products, depending on conditions. what product (one) could not be obtained
Answer:
will you help us with that one please
lewis acids and bases are most closely with which process?
Answer:
Lewis acids and bases are most closely associated with ELECTRON TRANSFER. A Lewis acid is defined as as a chemical specie that can accept an electron pair from a Lewis base to form a Lewis adduct while a Lewis base is defined as a specie which can donate an electron pair to a Lewis acid or an acceptor compound. Thus, Lewis base and acid has to do with electrons transfer.
Explanation:
balanced equation for bromine and potassium iodide?
Answer:
Br2+KI→KBr+I2
Explanation:
Is the relationship between temperature and water density an inverse or direct relationship?
The relationship between temperature and water density is an inverse relationship.
Temperature:-A measure of the typical kinetic energy of the atoms or molecules in a system, the temperature is a physical variable that expresses hot and cold.
Density:-The definition of density is the mass of a substance per unit volume. Density is defined as the ratio of mass to volume, or mass per unit volume.
Relation between temperature and density:-An inverse relationship exists between temperature and density. The density of water drops because of the increased distance between water molecules as temperature rises. Water's density rises when its temperature drops, but only to a certain extent.
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Describe the reasoning behind using phosphorus and boron in conjunction
with one another.
defective greatest formerly knows sd ghost;
Why are reaction orders not always equal to the coefficients in a balanced chemical equation?
The reaction order is given as the relationship between the concentrations of the reactants and the rate of a reaction.
The order of a rate law is the sum of the exponents of the concentration of the reactants.The rate law of a reaction is used to understand the composition of the reaction mixture. Specifically, the reaction order is the exponent to which the concentration of that reactants are raised, and it indicates that how well the concentration of a reactants affects the rate of a reaction.There are number of methods used to determine the reaction order. Reaction orders not always equal to the coefficients in a balanced chemical equation , it only determined the number of molecules per mole present in a given reaction.Learn more about order of reaction here..
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How many grams of oxygen are contained in a sample of H2O that also contains 3.85 moles of hydrogen atoms?
Answer:
30.8 g oxygen
Explanation:
There are 1/2 as many Oxygen moles as hydrogen moles in H2O
so there are 3.85 / 2 * 16 gm of oxygen = 30.8 gms oxygen
Consider the reaction below.
C₂H4(g) + H₂(g) → C₂H6(g)
Answer:
I don't see a question.
Explanation:
I do see a reaction in which tells us that the C2H4 has a double-bonded C. The additrtion of H2 breaks this bond and provides the two bonding sites needed for the 2 new hydrogen atoms.
H2C=CH2 + H2 → H3C-CH3
4
25.0 mL of a 0.625 M solution are diluted to a total volume of 100 mL. What is
the molarity of the new solution? (Report your answer to three places past the
decimal point. Moodle is looking for a number only, no units.)
Answer:
.156 M
Explanation:
diluting 25 to 100 cuts the M to 1/4 of the original
1/4 * .625 = .15625
what does ivf stand for and sexual intercom
Answer:IVF
Explanation:
All of the following are anthropogenic greenhouse gases except Group of answer choices a. carbon dioxide. b. molecular oxygen. c. chlorofluorocarbons (CFCs). d. methane.
Answer:
c
Explanation:
its not a plant based gas
Which of the following equations represents a nuclear charge?
A) H2O(s) + Heat --> H2O(I)
B) H2CO3(aq) --> H2O(I) + CO2(g)
C) 14 14 0
C --> N + e
6 7 -1
D) H2CO3(aq) + Ca(OH)2(aq) --> CaCO3(s) + 2 H2O(I)
Select one:
a. A
b. B
c. C
d. D
S + 6 HNO3 → H₂SO4 + 6 NO₂ + 2 H₂O
-
In the above equation, how many grams of water can be made when 5.8 moles of HNO3 are consumed?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer
as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your
answer incorrect.:
Element
Molar
Mass
Hydrogen 1
Nitrogen 14
Sulfur
32
Oxygen 16
35 g (Rounded to the nearest tenth) H₂O can be made when 5.8 moles of HNO₃ are consumed.
What is Mole ratio ?Mole Ratio is a conversion factor between compounds in a chemical reaction, that is derived from the coefficients of the compounds in a balanced equation.
The mole ratio is therefore used to convert between quantities of compounds in a chemical reaction.
The mole ratio of HNO₃ and H₂O is 6 : 2
Hence, 16.9 moles of HNO₃ will produce = 2/6 × 5.8 = 1.93 moles of H₂O
Also,
Mass = Moles × M.Mass
Mass = 1.93 mol × 18.02 g/mol
Mass = 34.83 g H₂O
= 35 g (Rounded to the nearest tenth)
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is Zinc + Hydrogen Chloride a chem. change why or why not
Answer:
When zinc reacts with hydrochloric acid, the reaction bubbles vigorously as hydrogen gas is produced. The production of a gas is also an indication that a chemical reaction is occurring.
Explanation:
A 10.0 ml portion of 0.010 m hcl is diluted by adding it to100.0 ml of water. what is the ph of the solution
From the calculation, the pH of the solution after dilution is 3.
What is the pH?The pH is the hydrogen ion concentration of the solution. Now we know that;
C1 = 0.010 m
V1 = 10.0 ml
V2 = 10.0 ml + 100.0 ml = 110 ml
C2 = ?
C1V1 = C2V2
C2 = C1V1 /V2
C2 = 0.010 m * 10.0 ml / 110 ml
C2 = 0.00091 M
pH = -log[0.00091 M]
pH = 3
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Take a small amount of water and milk in two different but similar container's. Freze them by putting them in a refrigerator .NOw melt them,in the sunshine,boil them on the same stove under the same condition ,and evaporate them completely .note there time during changing of their states .what similarities and differences you find while changing the states of noth of the materials
All liquids evaporate if exposed to certain elements.
What is Evaporation ?Evaporation is the process by which water changes from a liquid to a gas or vapor.
Evaporation is the primary pathway that water moves from the liquid state back into the water cycle as atmospheric water vapor.
All liquids evaporate if exposed to certain elements.
The rate at which a liquid evaporates depends on its molecular structure.
The other factors that affect evaporation are surface area, temperature and air movement.
We can also do a few fairly simple experiments to demonstrate the effect that the various factors have on the rate of evaporation.
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Which of the following is NOT an example of pseudoscience?
A. Psychics
B. Healing crystals
C. Vaccines
D. Acupuncture
Answer:
I think its vaccines
Which statement best describes how the scientific community analyzes data?
OA. A scientist must always keep his or her data hidden from other
scientists.
B. There is only one possible conclusion to be drawn from a set of
data.
OC. Each scientist must use his or her own, unique data.
OD. Scientists can come to different conclusions based on the same
data.
SUBMIT
Answer: D. Scientists can come to different conclusions based on the same data.
Potassium chlorate decomposes according the following BALANCED equation.
2 KClO3 → 2 KCl + 3O2
How many grams of oxygen gas would be produced if 33.0 g of potassium chlorate react?
Answer:
12.9 g O₂
Explanation:
To find the mass of oxygen gas produced, you need to (1) convert grams KClO₃ to moles KClO₃ (via molar mass from periodic table values), then (2) convert moles KClO₃ to moles O₂ (via mole-to-mole ratio from reaction coefficients), and then (3) convert moles O₂ to grams O₂ (via molar mass). It is important to arrange the conversions/ratios in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 3 sig figs to match the given value (33.0 g).
Molar Mass (KClO₃): 39.098 g/mol + 35.45 g/mol + 3(15.998 g/mol)
Molar Mass (KClO₃): 122.542 g/mol
2 KClO₃ ---> 2 KCl + 3 O₂
Molar Mass (O₂): 2(15.998 g/mol)
Molar Mass (O₂): 31.996 g/mol
33.0 g KClO₃ 1 mole 3 moles O₂ 31.996 g
-------------------- x ------------------- x ----------------------- x ------------------ =
122.542 g 2 moles KClO₃ 1 mole
= 12.9 g O₂
We know the sun is primarily made from hydrogen and helium on the basis of its:
We know the sun is primarily made from hydrogen and helium on the basis of its spectrum.
What is Sun's spectrum?Sun's spectrum refers to the light of the Sun whose wavelength spectra can be used to identify atomic composition.
Thus spectrum (Sun's spectrum) initiates with the red light (700 nm) and ends with the blue (380 nm).
In conclusion, we know the sun is primarily made from hydrogen and helium on the basis of its spectrum.
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Ammonia chemically reacts with oxygen gas to produce nitric oxide and water
. What mass of oxygen gas is consumed by the reaction of 9.98 g of ammonia?
Round your answer to 3 significant digits.
9.98 g of NH₃ reacts with 23.4 g of O₂ (up to 3 significant figure).
What is Significant figures ?The digits of a number that are used to express it to the required degree of accuracy, starting from the first non-zero digit.
The given chemical equation ;
4NH₃ + 5O₂ ---> 4NO + 6H₂O
Therefore,
4 moles of NH₃ reacts with 5 moles of O₂.
i.e,
68 g of NH₃ reacts with 160g of O₂.
Therefore,
9.98 g of NH₃ reacts with :
= 160/68 x 9.98
= 23.4 g of O₂ (up to 3 significant figure)
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Fatty acids are a component of:
According to the research, fatty acids, which are long molecules in the form of a hydrocarbon chain, are a component of lipids.
What are lipids?They are hydrophobic and water-insoluble molecules that are formed from the esterification of alcohols with fatty acids.
Lipids are a vital part of the diet of living beings since many vitamins are assimilated in the presence of certain lipids and many fatty acids are essential for animal metabolism.
Therefore, we can conclude that according to the research, fatty acids, which are long molecules in the form of a hydrocarbon chain, are a component of lipids.
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