Answer:
∆T = imK
∆T = Change in boiling point (B.P.)
i = van't Hoff factor = 2 for NaCl (Na+ and Cl2_
m = molality = 0.321 m
k = boiling point constant for water = 0.512 deg/m
∆T = (2)(0.321)(0.512) = 0.329 degrees
Since the normal B.P. for water is 100ºC, the new boiling point of this solution is 100 + 0.329 = 100.329ºC
So Our Answer is 100.329ºC
The boiling point of the 0.321 m NaCl solution has been 100.329 degrees Celsius.
The boiling point has been defined at the temperature at which the liquid started to convert to gas.
The van't Hoff factor has been a value of the number of ions formed by the dissociation of 1 formula unit of a compound.
The change in the boiling point of the sample, ([tex]\Delta T[/tex]) has been given by:
[tex]\Delta T=imK[/tex]
Where, the van't Hoff factor for NaCl, i =-2
The molality of the sample, m =0.321 m
The boiling point constant of water, [tex]K=0.512\;^\circ m^-^1[/tex]
Substituting the values for change in temperature ([tex]\Delta T[/tex]):
[tex]\Delta T=2\;\times\;0.321\;\times\;0.512\;^\circ C\\\Delta T=0.329\;^\circ C[/tex]
The change in the temperature of the water on the addition of NaCl has been 0.329 degrees Celsius.
The initial temperature of the water has been 100 degrees Celsius. The new temperature (T) of the NaCl solution has been:
[tex]T=100\;+\;0.329\;^\circ \text C\\T=100.329\;^\circ \text C\\[/tex]
The new boiling point of the NaCl solution has been 100.329 degrees Celsius.
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Based on table N of the reference tables what is the number of hours required for 42k (potassium -42) to undergo three half-life periods
The number of hours required : 37.2 hours
Further explanationGiven
⁴²K (potassium -42)
Required
The number of hours
Solution
The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.
Usually, radioactive elements have an unstable atomic nucleus.
Based on Table N(attached), the half-life for ⁴²K is 12.4 hours, which means half of a sample of ⁴²K will decay in 12.4 hours
For three half-life periods :
[tex]\tt 3\times 12.4=37.2~hours[/tex]
Which of these chemical equations demonstrates the law of conservation of mass?
F. C3H8 + 4 O2 → 3 CO2 + 4 H2O
G. 2 H2 + O2 à 2 H2O
H. H + O à H2O
J. Mn(OH)2 + H3PO4 à 2Mn3(PO4)2 + 2H2O
Answer:h
Explanation:
Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements.
Answer: Edgy, 2020
Explanation: <3
Answer:
refer to picture below :)
Explanation:
Food undergoes both physical and chemical changes during digestion. Which parts of the digestive process listed below is a physical change that takes place in the mouth?
Answer:
To answer your question use the code ICE on here to get your answer works every time for me hope this helps
*
What part does uplift play in the rock cycle?
A. It pulls rocks deep into Earth.
B. It pushes rocks up towards Earth's surface.
C. It breaks rocks into sediment.
D.It decreases pressure on buried rocks.
Answer:
Sometimes forces act to pull sections of the Earth's crust apart. At other times they are forced together. All this movement can cause rocks that were once underground to be brought up to the Earth's surface. This process is called uplift.
Explanation:
Hope this helped you out have a good day
What are the four level of organization in a multicellular organism?
Answer:
An organism is made up of four levels of organization: cells, tissues, organs, and organ systems. These levels reduce complex anatomical structures into groups; this organization makes the components easier to understand
Explanation:
What is the force of attraction between two atoms that are combined?
a. chemical bond
b. atomic bond
c. physical property
d. magnetic bond
Answer:
a
Explanation
Chemical bond refers to the forces holding atoms together to form molecules and solids. This force is of an electric nature, and the attraction between electrons of one atom to the nucleus of another atom contributes to what is known as chemical bonds.
Can someone please help me with this???
Answer:
1)
Hg
80 protons, 80 electrons, 121 neutrons
2)
Mo
42 protons, 42 electrons, 54 neutrons
3)
Symbol is Cu, Mass is 64, 29 Protons
4)
C
Atomic number is 6, 6 protons, 6 electrons, 6 neutrons
5)
Symbol is P, 15 protons, 15 electrons, 16 neutrons
6)
Pb
Atomic number is 82, 82 electrons, 125 neutrons
7)
Na
Mass is 23, 11 protons, 11 electrons.
Hopefully this helps!
What is the name given to the group 0 elements
Answer:
the noble gases
Question 5 (2 points)
Which of the following has a higher boiling point, CO2 or Co? Explain.
Answer:
CO2 has higher boiling point as compared to CO
Explanation:
Because CO is linear molecule anf zero dipole moment while CO2 is non linear and it has dipole moment
_AICI3–> _AI + _Cl2
I need help
Answer:
2AlCl₃ ⇒ 2Al + 3Cl₂
Explanation:
Balance the equation–making sure there's an equal amount of reactants and products on both sides.
Which is the best example of forces acting in the same direction?
only if u answer correctly u will get to recive 10pts and brainleist!
How is a doorbell an example of an electrical transformation
What is the coordination number for Potassium Nitrate?
Answer:
The coordination number is 8
Potassium nitrate has an octahedral coordination structure
Are scientist improving the plant or corrupting it
Answer:
46 percent of trees have been cut down.
Scienctists helps plants, but humans do destroy a lot of plants.
Scientists - helps increase plant growth.
Woodchoppers - helps decrease plant growth.
Which has more energy, 5 kilograms of dynamite or 10 kilograms of dynamite? Why?
Answer: The main purpose of any warhead is to inflict damage on the target. The way the damage is caused may vary with different types of warheads, but in the most general sense, damage is caused by the transfer of energy from the warhead to the target. The energy is typically mechanical in nature and takes the form of a shock wave or the kinetic energy of fragments. In either case, a large amount of energy must be released. For many warheads that energy is stored in the form of chemical explosives.
Explosive Reactions
There are many chemical reactions that will release energy. These are known as exothermic reactions. If the reaction proceeds slowly, the released energy will be dissipated and there will be few noticeable effects other than an increase in temperature. On the other hand, if the reaction proceeds very rapidly, then the energy will not be dissipated. Thus, a great quantity of energy can be deposited into a relatively small volume, then manifest itself by a rapid expansion of hot gases, which in turn can create a shock wave or propel fragments outwards at high speed. Chemical explosions may be distinguished from other exothermic reactions by the extreme rapidity of their reactions. In addition to the violent release of energy, chemical explosions must provide a means to transfer the energy into mechanical work. This is accomplished by expanding product gases from the reaction. If no gases are produced, then the energy will remain in the products as heat.
Most chemical explosions involve a limited set of simple reactions, all of which involve oxidation (reaction with oxygen). A relatively easy way to balance chemical explosive equations is to assume that the following partial reactions take place to their maximum extent (meaning one of the reactants is totally consumed) and in order of precedence:
Explanation:
Answer:
10 kilograms of dynamite
Explanation:
The more volume an object has the more potential energy is available if it is the same material. 10 kilograms is larger than 5 kilograms.
Answer correctly please !!!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!!!
elements have the same number of what when you move from the left of the periodic table to the right?
Can someone fill out the chart please?
Answer:
LOL i don't even know
Explanation:
How much force is required to accelerate an 8-kg wagon at a rate of 15 m/s
Answer:
120 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 8 × 15
We have the final answer as
120 NHope this helps you
Worth 50 points. Please answer correctly
Answer:
question 2 is false
Explanation:
6 is D
You are asked to get a compound that has a low melting point and cannot
conduct electricity, which would you pick if you saw three bottles labeled as Lici,
NaBr, and BrF. What type of bond did you get? *
Answer:
the third
Explanation:
Based on the reading, what can you infer about
aspirin's ester group?
It provides aspirin's pain-killing ability.
It makes the compound more digestible.
It reduces fevers.
Answer:
it makes the compound more digestable
Explanation:
Answer:
B.it makes the compound more digestible
Explanation:
edg 2020 just got it right
brainliest please?
Water is produced from the reaction of hydrogen and oxygen gas, according to the equation below. What is the excess reactant in the reaction of 4.2 moles of hydrogen with 3.0 moles of oxygen?
2H2(g) + O2(g) = 2H2O(L)
Select one:
a. Water
b. Oxygen
c. No excess reactant
d. Hydrogen
Explanation:
Mole ratio of Oxygen to Hydrogen gas = 1 : 2.
If we use 3.0 moles of oxygen gas, we would need 3.0 * 2 = 6.0 mol of hydrogen gas.
However we only have 4.2 mol of hydrogen. Therefore hydrogen is limiting and oxygen is in excess. (B)
Consider X + Z -> ?
Assuming the following:
The product is an ionic compound.
Element X has 2 valence electrons
Elements Z has 6 valence electrons
Which general formula would be created?
A)ZX
B)Z^2x
C)XZ
D)X2^Z
Answer:
C
Explanation:
Element Z acquires two electrons from element X for stability
How are a mole and a dozen similar?
Answer:
Each names a given number of objects.
Explanation:
What is the molar mass of phosphorus pentachloride and uranium hexafluoride?
Answer:
PCl₅ = 208.22g/mol. UF₆ = 352.03g/mol.
Explanation:
Find the atomic mass of each element–and if there's a subscript (you multiply the atomic mass by that much). P= 30.97g, Cl= 35.45g; 30.97+35.45(5) = 208.22g [same idea with UF₆]
how can one separate and collect the solvent from a salt solution
Which physical properties do glass and ice share? Select the two correct
answerS.
DA Density
D B. State
DC. Melting point
D D. Brittleness
SUBMIT
B, C
verified just did it
B. State
C. Melting Point
Both ice and glass comes under the category of solids since they have definite shape and definite volume. Both the ice and glass allows light to pass through it, that means they are transparent in nature.Ice floats, we can infer that ice must be less dense than water. If water is frozen in a glass jar, the glass jar breaks. This implies they both have similar densities.Thus, options B and C are correct.
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