PLEASE HELP ME WITH THIS QUESTION THIS FREAKING SUCKS
A student dissolves 0.250 mol NaC1 in 2.05 kg H20. What is molality of the resulting solution? Show your work.
Answer:
m = 0.122 m
Explanation:
Molality(m): A measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.
[tex]\mathrm{Molality\:Formula}:\quad \mathrm m = \dfrac{ mole\:of\:solute }{ mass\:of\:solvent\:in\:kg }[/tex]
[tex]\mathrm m = \dfrac{ mole}{ kg }[/tex]
[tex]\mathrm{Substitute\:the\:numbers\:into\:the\:"Molality\:Formula"}[/tex]
[tex]\mathrm m = \dfrac{ 0.250 }{ 2.05 }[/tex]
[tex]\mathrm{Divide\:0.250\:by\:2.05\:and\:get\:0.12195122}[/tex]
[tex]\mathrm m = {0.12195122}[/tex]
[tex]\mathrm{Round\:to\:the\:nearest\:thousandths\:place}[/tex]
[tex]\mathrm m = 0.122[/tex]
Answer:
To calculate the molality of the resulting solution, we need to use the formula:
Molality (m) = moles of solute / mass of solvent (in kg)
Given:
Number of moles of NaCl (solute) = 0.250 mol
Mass of H2O (solvent) = 2.05 kg
Step 1: Convert the mass of the solvent from grams to kilograms:
Mass of H2O = 2.05 kg
Step 2: Calculate the molality using the formula:
Molality (m) = moles of solute / mass of solvent (in kg)
Molality = 0.250 mol / 2.05 kg
Molality = 0.122 mol/kg
Therefore, the molality of the resulting solution is 0.122 mol/kg.
PLEASE MARK AS BRAINLIEST
You have 1.50 L of a stock solution of 4.75 M hydrochloric acid. You need to dilute it to 1.20 M. What is the maximum volume of the dilute solution can you make
Answer:
5.9375 L
Explanation:
To solve this question you use the proportionality of dilutions
C1 × V1 = C2 × V2
4.75 M × 1.50 L = 1.20 L × V2
⇒ V2 = (4.75 M × 1.50 L) / (1.20 L) = 5.9375 L
A. How many significant figures in the following?
4.80 x 10^6 =
Answer:
Number of Significant Figures: 3
The Significant Figures are 4 8 0
What is the definition of JET STREAM?
A.the winds that blow from the west and are in a narrow stream
B. generally,westerly winds concentrated in a relatively narrow and shallow stream up inn upper troposphere of the earth
C the winds that blow and are in a shallow stream in earth
D with that blow around the earth
Answer:
I believe D
Explanation:
I am dearly sorry If I am wrong,
Answer:
I believe the answer is B
Explanation:
How does the emission spectrum of the hydrogen atom provide evidence for the Bohr model of the atom
A reaction is monitored and the products are found to be a salt and water. The reactant(s) must have been _____. two metal-nonmetal compounds a metal-nonmetal compound a metal and a metal-nonmetal compound an acid and a base
Answer:
D.) An acid and a base
Explanation:
One part of an acid is H+ and the other part is a negatively charged ion. One part of a base is -OH and the other part is a positively charged ion. When an acid and base react, the H+ and -OH combine to form water and the ions combine to form a salt.
The others are incorrect because they do not guarantee that water (H2O) and a salt are products.
A student heated a blue copper sulfate crystal in a test tube. After a few minutes, she observed that the crystal turned white and the inside of the test tube was covered with a thin film of water. The water inside the test tube most likely __.
Multiple choice question.
seeped through the sides of the test tube
was left from cleaning the test tube the night before
condensed from the air around the test tube
came from the blue copper sulfate crystal, which is a hydrate
The water from inside the test tube most likely came from the blue copper sulfate crystal which is a hydrated salt.
Hydrated saltsHydrated salts contain water of hydration.
A blue copper sulfate crystal contains water of hydration.
When heated, the water evaporates off to give an anhydrous salt which appears colorless.
The equation of the reaction is as follows:
CuSO4•5H2O -----> CuSO4 + 5H2O(g)
More on water of hydration can be found here: https://brainly.com/question/919417
help me please ┐(‘～`;)┌
Answer: (2)react completely in the reaction
limiting reactant determines the number of moles in a chemical reaction
excess reactant is the reactant with an excess number of moles
Enter an equation to show how h2po3− can act as a base with hs− acting as an acid. Express your answer as a chemical equation. Identify all of the phases in your answer.
The acid - base equation between H2PO3^- and HS^- is H2PO3^- + HS^- ⇄S^- + H3PO3.
What is an acid?An acid is a substance that can donate hydrogen ions while a base is a substance that can accept hydrogen ion. This is the acid base definition according to Brownstead - Lowry.
To show the acid - base relationship between H2PO3^- and HS^-, we have the equation;
H2PO3^- + HS^- ⇄S^- + H3PO3
Learn more about acids and bases: https://brainly.com/question/10282816
could anyone possibly help me ┐(´ー｀)┌
Answer:
Candela
Explanation:
The SI unit of luminous intensity is candela.It is written as Cd.Note
If it's only intensity of radiant energy then the unit is W/m^2
Why does benzene form a ring?
Answer:
All of the carbon-carbon bonds have exactly the same lengths - somewhere between single and double bonds. There are delocalized electrons above and below the plane of the ring. The presence of the delocalized electrons
Explanation:
hope it helps
Is this a scientific model? Use complete sentences to explain why or why not.
Answer:
Yes
Explanation:
Beacuse it shows the tempature of the day
Which use of pomace has become more available through new technologies?
A) animal feed
B) soil additives
C) landscaping mulch
D) food flavorings
Food flavorings as use of pomace has become more available through new technologies
What is a pomace?This simply refers to a dry residue of a particular material from which a liquid is extracted. However, it is highly rich in nutrients such as:
Ursolic acidMineralsDietary fiberAntioxidants and many more...So therefore, food flavorings as use of pomace has become more available through new technologies
Learn more about pomace:
https://brainly.com/question/24584263
Can you post all the answers for this quick check Reactants vs. Products Quick Check
According to the law of conservation of mass, which statement about chemical reactions is always true?(1 point)
1) According to the law of conservation of mass, which statement about chemical reactions is always true?
Answer: The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.
2) When 1 mole of nitrogen gas (N2) reacts with 3 moles of hydrogen gas (H2), how many moles of ammonia (NH3) are produced?
Answer:
2 moles
3) Sulfur trioxide gas combines with water to form a single product.
SO3 + H2O → ?
Based on the law of conservation of mass, which option is the product of the reaction?
Answer:
H2SO4
4) Lead (II) nitrate as Pb(NO3)2 and potassium iodide as KI combine to form the products shown.
2 KNO3 + PbI2
How many moles of each reactant are involved in the reaction?
Answer:
1 mole of lead (II) nitrate and 2 moles of potassium iodide
5) In a reaction, 1 mole of silver nitrate combines with 1 mole of sodium chloride.
AgNO3 + NaCl
Which statement about the product is justified by the law of conservation of mass?
Answer:
There will be 1 mole of silver (Ag) in the product.
According to the law of conservation of mass, the statement that is always true about chemical reactions is "The total mass of the reactants is equal to the total mass of the products."
The law of conservation of mass states that in a closed system, the total mass of substances before a chemical reaction is equal to the total mass of substances after the reaction.
The matter is neither created nor destroyed during a chemical reaction; it is simply rearranged to form new substances.
This principle holds true for all chemical reactions, regardless of the types of substances involved or the complexity of the reaction.
It also helps to establish the stoichiometry of reactions, which involves determining the relative quantities of substances involved in a reaction based on their balanced chemical equation.
To learn more about the law of conservation of mass, follow the link:
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Which statement best explains why animals have papillae?
Answer:Papillae contain taste buds that help animals determine whether food is safe to eat.
Explanation:
How many moles of carbon dioxide gas occupy a volume of 81. 3.
Answer:
239
Explanation:
i think this is the answer
A balloon that had a volume of 3. 50 L at 25. 0°C is placed in a hot room at 40. 0°C. If the pressure remains constant at 1. 00 atm, what is the new volume of the balloon in the hot room?.
Plsssssssssssssssssssssssssssssssssssssssss
Answer:
laurasia and gondwana is the correct answer
Which line on the graph (1, 2, or 3) represents the system at dynamic equilibrium? Explain your answer.
Answer:
line 2
Explanation:
Because it's where the products and reactants meet together.
The system at dynamic equilibrium is 2.
What is dynamic equilibrium?
Rate of forward reaction is equal to the rate of backward reaction.Dynamic Equilibrium can be described because of the state of a given device wherein the reversible response taking vicinity in it stops converting the ratio of reactants and merchandise, but there may be a motion of materials between the reactants and the products.Many physical and chemical processes are reversible. A reversible system is stated to be in dynamic equilibrium while the ahead and reverse procedures arise on the same price, ensuing in no observable change within the system.
Learn more about dynamic equilibrium here:-https://brainly.com/question/1233365#SPJ2
2. Which moon phase occurs directly before a
New Moon?
A. Waxing Crescent
B. First Quarter
C. Waning Crescent
D. Third/Last Quarter
If you can answer question 4 on the picture as well that will be helpful
Answer:
waxing crescent
and 4 nbr ans is C
Germanium has an atomic number of 32 and an atomic mass of 72.61. What is the total number of electrons in an atom of germanium?
Answer:
32
Explanation:
Because if the atomic number is 32 that is how many electrons are found in the element. There are 42 neutrons and 32 protons
balance the following chemical equation by providing the correct coefficients fe+h2so4 fe(so4)3 + h2
help me please
Answer:
2Fe + 3H2SO4 + Fe2(SO4)3+ 3H2
Explanation:
1. Fe (SO4) 3 is an incorrectly written formula because iron is trivalent as we can see by this three ahead of SO4. SO4 is divalent always.
2. since (SO4) is 3, this three shows us that there must be 3 in the reactants as well.
so now there is 3H2SO4
3. Since we have added 3 to one hydrogen we must add another. So now it's 3H2
4. and finally iron. In Fe2 (SO4) 3 we see this 2 in front of Fe which means it goes 2Fe.
In mitosis, how does a daughter cell compare with its parent cell?
A.
A daughter cell and its parent cell are exact copies of each other.
B.
A daughter cell has twice as many chromosomes as its parent cell.
C.
A daughter cell has half as many chromosomes as its parent cell.
D.
A daughter cell has no similarity to its parent cell.
How is water important in our life?
(show in numbers the minerals that we need and is found in water)
Answer:
Water plays many important roles in the body including,flushing waste from the body,regulating body temperature,transportation of nutrients and is necessary for digestion.No wonder it is considered "essential"!.Plain water is the best choice for hydrating the body.
Explanation:
hope it helps you><
Describe two ways of using solar energy.
Where is the production of hydroelectric energy practical?
Describe two ways to release biomass energy.
Describe two ways to use geothermal energy.
PLEASE ITS DUE IN 6 MINTUES
Answer:
There are three primary technologies by which solar energy is harnessed: photovoltaics (PV), which directly convert light to electricity; concentrating solar power (CSP), which uses heat from the sun (thermal energy) to drive utility-scale, electric turbines; and solar heating and cooling (SHC) systems, which collect ...
Hydropower is the most important and widely-used renewable source of energy. Hydropower represents about 17% (International Energy Agency) of total electricity production. China is the largest producer of hydroelectricity, followed by Canada, Brazil, and the United States (Source: Energy Information Administration).
There are four ways to release the energy stored in biomass: burning, bacterial decay, fermentation, and conversion to gas/liquid fuel.
Geothermal energy can heat, cool, and generate electricity: Geothermal energy can be used in different ways depending on the resource and technology chosen—heating and cooling buildings through geothermal heat pumps, generating electricity through geothermal power plants, and heating structures through direct-use ...
Can someone please help me? :(
Answer:
glaciers
Explanation:
The reaction between lead(II) nitrate and aluminum chloride
produces lead(II) chloride and aluminum nitrate. Find the mole
ratios of lead(II) nitrate to aluminum chloride and lead(II)
chloride to aluminum nitrate.
The mole ratio of lead (II) nitrate to aluminum chloride would be 3:2 while that of lead (II) chloride to aluminum nitrate would also be 3:2
Chemical equations
The balanced chemical equation of the reaction between lead(II) nitrate and aluminum chloride is as follows:
3Pb(NO3)2 + 2AlCl3 → 3PbCl2 + 2Al(NO3)3
Thus, the mole ratio of lead (II) nitrate to aluminum chloride is 3:2 while the mole ratio of lead (II) chloride to aluminum nitrate is also 3:2
More on chemical equations can be found here: https://brainly.com/question/20492533
Answer:3:2 and 3:2
Explanation: got it right on CK12
Why doesn't the United States embrace nuclear energy?.
Answer: Advantages and Challenges of Nuclear Energy Nuclear energy protects air quality by producing massive amounts of carbon-free electricity. It powers communities in 28 U.S. states and contributes to many non-electric applications, ranging from the medical field to space exploration.
Explanation:
An example of a heterogeneous mixture is
A)
soil
B)
sugar
C)
carbon dioxide
D)
carbon monoxide
PLEASE HELP!!! ‼️45 POINTS‼️
What happens to the temperature of the water when it begins to melt?
A. The temperature continues to decrease during the change of
state.
B. The temperature remains at 0°C until the change of state is
complete.
C. The temperature remains at 100°C until the change of state is
complete
D. The temperature continues to increase during the change of state.
