"63" kj are released. A further solution is provided below.
The equation is:
[tex]2 Na_2O_2 (s) + 2 H_2O (l) \rightarrow 4NaOH (s) + O_2 (g)[/tex]Value of ΔH,
-126 kJAs we know,
4 moles of NaOH - (-126) kJ 2 moles of NaOH - XNow,
→ [tex]4\times X=-126\times 2[/tex]
→ [tex]4X = -252[/tex]
→ [tex]X = -\frac{252}{4}[/tex]
→ [tex]= -63[/tex]
Thus the above response is correct.
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Calculate the formula for the following hydrate
composed of 76.9% CaSO3 and 23.1% H2O.
CaSO3 H20
O CaSO3 • 2H20
CaSO3 • 3H20
Answer:
CaSO₃·2H₂O
Explanation:
Empirically => CaSO₃·nH₂O
%H₂O = n(H₂O)/f.wt. x 100%
23.1% = n(H₂O)100/Ca + S +3O + nH₂O
23.1 = n(18)·100/[40 + 32 + 3(16) + n(18)]
1800n = 23.1[40 + 32 + 3(16) + n(18)]
1800n = 924 + 739.2 + 1108.8 + 415.8n
1800n - 415.8n = 924 + 739.2 + 1108.8
1385n = 2772
n = 2772/1385 = 2
∴ numerical formula => CaSO₃·2H₂O
Select the correct term to complete each sentence.
1. If you ___________ the wavelength, the electromagnetic radiation energy will double.
2. The energy of the electromagnetic radiation will_____________ if you halve the wavenumber.
3. When the frequency of the light is doubled, its energy will___________.
a. halve
b. double
Answer: 1. halve
2. halve
3. double
Explanation:
The relationship between wavelength and energy of the wave follows the equation:
[tex]E=\frac{hc}{\lambda}[/tex]
E= energy
[tex]\lambda [/tex] = wavelength of the wave
h = Planck's constant
c = speed of light
Thus as wavelength and energy have inverse realation, when wavelength will halve , energy will double.
2. The between wavenumber and energy of the wave follows the equation:
[tex]E=h\times c\times \bar{\nu}[/tex]
E= energy
[tex]\bar{\nu}[/tex][tex]\nubar[/tex] = wavenumber of the wave
h = Planck's constant
c = speed of light
Thus as wavenumber and energy have direct relation, when wavenumber will halve , energy will be halved.
3. The relationship between energy and frequency of the wave follows the equation:
[tex]E=h\times \nu[/tex]
where
E = energy
h = Planck's constant
[tex]\nu[/tex] = frequency of the wave
Thus as frequency and energy have direct realation, when frequency will double , energy will double.
How many muscle types is the muscular system made up of
Answer:
3
Explanation:
there are three types of muscles:
Skeletal(striated)SmoothCardiac3.5x10^5 x 4.81x10^-3
Answer:
there u go
Explanation:
Which of the following is the fundamental element found in all living organisms? A-iron B-carbon C-calcium D-magnesium
Answer:
D
Explanation:
Answer:
For me
Explanation:
it's carbon because it's part of our regular respiration
(GIVING BRAINLIEST!!!)What is the correct formula for the ionic compound that forms when oppositely- charged ions of calcium and carbonate attract?
(ANSWERS ARE IN THE IMAGE)
Answer:
CaCO₃
Explanation:
Calcium ion is written as Ca²⁺
Carbonate ion is written as CO₃²¯
During bonding, the +2 ions from the calcium and the –2 ions from the carbonate will cancel out given a net charge of zero as shown below:
Ca²⁺ + CO₃²¯ —> CaCO₃
Thus, the correct formula for the ionic compound that forms when oppositely charged ions of calcium and carbonate attract is CaCO₃.
Calculate the fraction of acetic acid that is in the dissociated form in his solution. Express your answer as a percentage. You will probably find some useful data in the ALEKS Data resource. acetic acid
Answer:
0.11%
Explanation:
Without mincing words, let us dive straight into the solution to the question/problem. The first step to solve this question is to write out the chemical reaction, that is the reaction showing the dissociation of acetic acid.
CH3COOH <=======================================> CH3COO⁻ + H⁺
Initially, the amount present in the acetic acid which is = 12M, the concentration for CH3COO⁻ and H⁺ is 0 respectively.
At equilibrium, the amount present in the acetic acid which is = 12 - x, the concentration for CH3COO⁻ = x and H⁺ = x respectively. Note that the ka for acetic acid = 1.8 × 10⁻⁵.
1.8 × 10⁻⁵ = x²/ 14 - x. Therefore, x = 0.0158 M.
The next thing to do is to calculate for the percentage of dissociation, this can be done as given below:
percentage of dissociation = x/14 × 100. Recall that the value that we got for x = 0.0158 M. Hence, the percentage of dissociation = 0.0158 M/ 14m × 100 = 0.11%
thermal decomposition of magnesium nitrate and magnesium hydroxide
Explanation:
hope it will help you. Wishing a nice day. enjoy with your answer
_______join allows movement in all directions
Explanation:
ball and socket joint.
it made of the round end of a bone fitting into a cup shaped socket in another.
example of ball and socket joint is the shoulder and hips
please helpp me i really need help
Answer:
second box is 2 C, third box is 3 C, and the last box is 3 C.
Explanation:
Why would Magnesium Phosphate (Mg3(PO4)2) not make an aqueous solution?
Please help!
Answer:
[tex]\boxed {\boxed {\sf Almost \ all \ phosphates \ are \ insoluble}}[/tex]
Explanation:
For magnesium phosphate to make an aqueous solution, it must be soluble in water.
Let's check the solubility rules. There are many different lists and versions, but it should mention a rule about phosphates.
All phosphates are insoluble except Na₃PO4 (sodium phosphate), K₃PO4 (potassium phosphate), and H₁₂N₃PO₄ (ammonium phosphate).Magnesium phosphate is included in "all phosphates" so it is insoluble and can't become an aqueous solution.
Magnesium Phosphate (Mg₃(PO₄)₂) would not make an aqueous solution because it is insoluble in water.
A solution is a homogeneous mixture of one or more solutes dissolved in a solvent.
solvent: the substance in which a solute dissolves to produce a homogeneous mixture.solute: the substance that dissolves in a solvent to produce a homogeneous mixture.According to the solubility rule, all phosphates are insoluble in water except sodium and potassium phosphates and thus magnesium phosphate does not form an aqueous.
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c. If the average basal rate of oxygen consumption for an adult is 15 L/hour, then calculate how many hours of oxygen use will you get from the 4.7 L tank?
Answer:
0.3hrs
Explanation:
Given parameters:
Average basal rate = 15L/hr
Volume of oxygen = 4.7L
Unknown:
Hours of oxygen use = ?
Solution:
Now to solve this rate problem, we need to find the time;
Hours of oxygen use = [tex]\frac{volume of oxygen }{average basal rate}[/tex]
Hours of oxygen use = [tex]\frac{4.7}{15}[/tex] = 0.3hrs
PLS HELP WILL GIVE BRAINLYEST What happens when the magnet is removed from the coil in a circuit?
a.
The current stops
c.
The voltage decreases
b.
The current changes direction
d.
Power output increases
1. A dry food product is contained in a 1 cm x 4 cm x 3 cm box using a polymer film to protect the oxygen sensitivity of the product. The concentration gradient across the film is defined by the oxygen concentration in air (0.01164 kg/m3) and 0.244 kg/m3 within the package. The oxygen diffusivity for the polymer film is 3 x 10-16 m2/s. Estimate a- the allowable flux of oxygen into the package (in kg O2/s), and b- the film thickness needed, to ensure a product shelf life of 10 months. The shelf life of the product is established as the time when oxidation reactions within the product have used 0.5 mol of oxygen.
Answer:
total is 20.8
Explanation:
thttjhrrdghg
Epsom salt can be used to season foods. How would you write its chemical
formula?
A. Na2CI B.NaCI
Answer:
B. NaCl
Explanation:
NaCl is sodium chloride, one form of it is epsom salt which we consume!
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What is the reactant that runs out first in a reaction called?
O A. The stoichiometry
O B. The limiting reagent
OC. The reactant coefficient
OD. The theoretical yield
(Answer is B.)
Answer:
limiting reactant
Answer: B) limiting reagent
HELP IGNORE IF YOU DON'T KNOW BRAINLIEST!!
Commercial vinegar is a 5.00% by mass aqueous solution of ethanoic acid. FIND MOLARITY of ethanoic acid in vinegar. Density of vinegar
is 1.00 g/mL
Answer:
What ever the other person said
Explanation:
What volume of H2so4 Solution Cspecific gravity=-1.28 and strength =24.7% by mass) will be required to react completely with 125g ZnC032?
The volume = 309.04 ml
Further explanationGiven
Specific gravity=-1.28 and strength =24.7% by mass of H₂SO₄
mass 125g of ZnC0₃
Required
The volume of H₂SO₄ Solution
Solution
Reaction
ZnCO₃ + H₂SO₄ → ZnSO₄ + CO₂ + H₂O
mol of ZnCO₃(MW=125.4 g/mol) :
[tex]\tt mol=\dfrac{125}{125.4}=0.997[/tex]
From equation, mol ZnCO₃ : H₂SO₄= 1 : 1 so mol H₂SO₄=0.997
mass of H₂SO₄ (MW=98 g/mol) :
[tex]\tt mass=mol\times MW=0.997\times 98=97.706~g[/tex]
mass of solution :
[tex]\tt \dfrac{100}{24.7}\times 97.706=395.57~g[/tex]
Volume of solution :(density of solution=1.28 g/ml for the reference substance is water(density=1 g/ml)
[tex]\tt V=\dfrac{395.57}{1.28}=309.04~ml[/tex]
Which of the following is a landscape feature caused by deposition
Explanation:
Depositional landforms are the visible evidence of processes that have deposited sediments or rocks after they were transported by flowing ice or water, wind or gravity. Examples include beaches, deltas, glacial moraines, sand dunes and salt domes.
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what are the 5 steps to drawing a lewis structure??
Which is an example of current electricity?
O A. Positively charged particles are attracted to negatively charged
particles.
O B. Negative and positive electric charges build up in different regions
of a cloud.
O C. Electrons flow from an outlet into a toaster, causing it to heat a
slice of bread.
O D. A person rubs a shoe on a rug, causing extra electrons to be
transferred to the shoe.
Answer:
C. Electrons flow from an outlet into a toaster, causing it to heat a
slice of bread.
Explanation:
Current produces a heating effect. Current may be used to produce a heating effect in appliances such as the electric pressing iron, toaster, oven etc.
When electrons flow from an outlet into a toaster and the current thus obtained heats a slice of bread, current is said to flow from the outlet into the toaster.
Let us remember that current refers to the flow of electrons in a circuit.
Someone who knows how to do this please help me!!!!!
A 62.9 g sample of ground water is found to have a lead concentration of 13.97 ppm. Calculate the mass of lead in the sample in milligrams.
Answer:
0.879 mg
Explanation:
To solve this problem we need to use the definition of ppm:
ppm = μg solute / g solutionWith the above information in mind we can calculate the micrograms of lead using the concentration (13.97 ppm) and mass of solution (62.9 g):
μg lead = 13.97 ppm * 62.9 gμg lead = 878.713 μgFinally we convert μg to mg:
878.713 μg * [tex]\frac{1mg}{1000ug}[/tex] = 0.879 mg of leadTo standardize a potassium permanganate solution, a 0.250 g sample of FAS (iron (II) ammonium sulfate hexahydrate; molar mass: 342 g) is dissolved in 25.00 mL distilled water, then acidified with sulfuric acid. The solution is then titrated with 35.00 mL potassium permanganate solution from a burette until a pale persistent purple color is attained. Calculate the molarity of the potassium permanganate solution.
Why is it useful to express a number in scientific notation?
A. Scientific notation removes fractions from math problems.
B. It makes large numbers easier to compare and work with.
C. Scientists couldn't use calculators to do their work otherwise.
D. Scientific notation is more accurate than writing out a number.
It is useful to express a number in scientific notation is it makes large numbers easier to compare and work with. The correct option is B.
What is scientific notation?Scientific notation is a way of writing mathematical equations easily. It is used when the number is very large, and they are written in decimals. It is a standard form of writing in the United States.
An example is 1.332 x 10-3.
Thus, the correct option is B. It makes large numbers easier to compare and work with.
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which action would not help a person stay safe during a tornado Giving brainliest
Answer:
B.... i think so, not sure lol
Answer:
B. Driving to get supplies
Explanation:
Don't drive in the middle of a tornado EHLBFDHS
6. According to the ideas of Democritus and Dalton, which of the following
statements is true about a piece of copper wire that s cut into the smallest
possible pieces? *
the copper will change properties and become a new element
the smallest piece of copper is no longer copper
the wire is still copper and does not change by cutting it
Answer: The wire is still copper and does not change by cutting it
Explanation:
Democritus postulated that all materials were composed of these tiny particles called as "atomos".
Daltons postulates are:.
1. All matter is made of very tiny particles called atoms.
2. Atoms is indivisible.
3. Atoms of a given element are identical in mass and chemical properties.
4. Atoms of different elements have different masses and chemical properties.
5. Atoms combine in the ratio of small whole numbers to form compounds.
6. The relative number and kinds of atoms are constant in a given compound.
Thus when copper wire is cut into the smallest possible pieces, the atoms were intact as they are indivisible and all atoms have same mass and chemical properties.Thus the wire is still copper and does not change by cutting it
3
Solve and derive the unit for Power
Answer:
Unit of power is watt
Explanation:
Power = rate of doing work
or
Power, P = W/t
Where
W is work done and t is time
The unit of work done is Joules and that of time is seconds.
Power, P = J/s
We know that, J/s = watts
Hence, the unit of power is watts.
Describe Photosynthesis and explain the number of atoms and molecules that are used in a reaction.
Answer:
Photosynthesis reactions are naturally occurring processes that take place in all green plants and most algae. During this process the plant uses light energy, carbon dioxide, and water to make food and then releases oxygen which all living organisms require to the atmosphere.During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen. These sugar molecules are the basis for more complex molecules made by the photosynthetic cell, such as glucose
Explanation:
How many valence electrons does a lithium (Li) atom have? The Periodic Table O A. 1 O B. 7 O C. 2 O D. 3