Answer:
The total change in enthalpy for the reaction is - 81533.6 J/mol
Explanation:
Given the data in the question;
Reaction;
HCl + NaOH → NaCl + H₂O
Where initial temperature is 21.2 °C and final temperature is 28.0 °C. Ccal is 1234.28 J
Moles of NaOH = 50.mL × 1.00 M = 50.0 mmol = 0.0500 mol
Moles of HCl = 50.mL × 1.00 M = 50.0 mmol = 0.0500 mol
so, 0.0500 moles of H₂O produced
Volume of solution = 50.mL + 50.mL = 100.0 mL
Mass of solution m = volume × density = 100.0mL × 1.0 g/mL = 100 g
now ,
Heat energy of Solution q= (mass × specific heat capacity × temp Δ) + Cal
we know that; The specific heat of water(H₂O) is 4.18 J/g°C.
so we substitute
q_soln = (100g × 4.18 × ( 28.0 °C - 21.2 °C) ) + 1234.28
q_soln = 2842.4 + 1234.28
q_soln = 4076.68 J
Enthalpy change for the neutralization is ΔH[tex]_{neutralization}[/tex]
ΔH[tex]_{neutralization}[/tex] = -q_soln / mole of water produced
so we substitute
ΔH[tex]_{neutralization}[/tex] = -( 4076.68 J ) / 0.0500 mol
ΔH[tex]_{neutralization}[/tex] = - 81533.6 J/mol
Therefore, the total change in enthalpy for the reaction is - 81533.6 J/mol
4. Calculate the molarity of a solution made by dissolving 23.0 g NaCl in enough water to make 0.040 L
of solution?
Answer:
The molarity (M) of a solution is the number of moles of solute dissolved in one liter of solution. To calculate the molarity of a solution, you divide the moles of solute by the volume of the solution expressed in liters.
Explanation:
How are scientific evidence and scientific conclusions related?
A.
Scientific evidence is based on scientific conclusions.
B.
Scientific conclusions are based on scientific evidence.
C.
Scientific conclusions must be made before examining scientific evidence.
D.
Scientific evidence and scientific conclusions are the same thing.
Answer: b
Explanation:
Answer:
B.
Scientific conclusions are based on scientific evidence.
Explanation:
The scientific method in steps:
1- Question
2- Research
3- Hypothesis
4- Experiment
5- Observe
6- Make a conclusion
7- Present you findings
Calculate the percent dissociation of butanoic acid (C3H2CO2H) in a 1.4 mM aqueous solution of the stuff.
Answer: The percent dissociation of butanoic acid is 9.8%
Explanation:
[tex]C_3H_2CO_2H\rightarrow H^+C_3H_2CO_2^-[/tex]
cM 0 0
[tex]c-c\alpha[/tex] [tex]c\alpha[/tex] [tex]c\alpha[/tex]
So dissociation constant will be:
[tex]K_a=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]
Give c= 1.4 mM = [tex]1.4\times 10^{-3}[/tex] and [tex]\alpha[/tex] = dissociation constant
[tex]K_a=1.5\times 10^{-5}[/tex]
Putting in the values we get:
[tex]1.5\times 10^{-5}=\frac{(1.4\times 10^{-3}\times \alpha)^2}{(1.4\times 10^{-3}-1.4\times 10^{-3}\times \alpha)}[/tex]
[tex](\alpha)=0.098=9.8\%[/tex]
Thus percent dissociation of butanoic acid is 9.8%
Put the following elements in order of increasing atomic number:
1. Strontium
2. Fluorine
3. Terbium
4. Zirconium
5. Iodine
6. Europium
7. Gallium
8. Aluminum
Answer:
Here is the answer ⬆️⬆️⬆️⬆️⬆️⬆️⬆️
The order of the given elements in increasing atomic number is given as F (9), Al (13), Ga (31), Sr (38), Zr (40), I(53) and Terbium (65).
What is atomic number?The atomic number of an element in periodic table is the number of electrons in its neutral atom. Elements are arranged in periodic table in an increasing order of atomic number from left to right.
An atom is composed of electrons, protons and neutrons. Protons are positively charged and electrons are negatively charged particles and they are equal in an atom. Thus, the total negative charge is neutralised by the negative charges.
The order for the given elements in periodic table in an increasing atomic number is F (9), Al (13), Ga (31), Sr (38), Zr (40), I(53) and Terbium (65).
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When drawing a Bohr model for Sulfur, how many energy levels will you
draw?
5
4
3
2.
Answer:
3
Explanation:
2,8,6
helllppp pls
Explain how human body maintains normal body temperatur
How many molecules are in 228.7 grams of KBr?
Answer:
the answer is 119.0023 grams
What is the main FUNCTION of the digestive system?
What are some of the main organs of the digestive system?
A student knows that hydrogen (H) atoms and oxygen (O) atoms combine to form water (H2O). The student correctly predicts that hydrogen (H) and sulfur (S) will combine to form hydrogen sulfide (H2S) On what is this prediction most likely based?
A. Oxygen and sulfur are in the same family with the same number of valence electrons.
B. Oxygen and sulfur are in the same period or row with the same number of neutrons
C. Oxygen and sulfur are in the same period or row with the same number of protons
D. Oxygen and sulfur are in the same family with the same number of energy levels.
Answer:
A
Explanation:
They both need to lose 2 electrons to form ions
Oxygen and sulphur are in the same family with the same number of valence electrons.
What is meant by valence electron?The electrons in an atom's outermost shell, or energy level, are called valence electrons.
Compared to oxygen, sulphur has more electron shells. This is because sulphur has three electron shells because it is in period 3 of the periodic table, whereas oxygen is in period 2 and has two electron shells.
Since there is just one link between these oxygen atoms, they will each have six valence electrons and a shared valence electron with sulphur.
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A substance that cannot be broken down into another substance by chemical or physical means is called a
Answer:
A substance that cannot be broken down into another substance by chemical or physical means is called an Element
What are the four types of human pathogens that
can cause infectious disease?
Answer:
Viruses, bacteria, fungi, and parasites.
Explanation:
hope this helps and is right :)
What is the density of nitrogen gas at 356.4 K?
Answer:
Nitrogen gas (chemical symbol N) is generally inert, nonmetallic, colorless, odorless and tasteless. Its atomic number is 7, and it has an atomic weight of 14.0067. Nitrogen has a density of 1.251 grams/liter at 0 C and a specific gravity of 0.96737, making it slightly lighter than air.
Explanation:
:)
how many elements are in 2o2
Answer: hope this helps
Explanation: I’m not sure but after some research here’s what I gathered The molecule has 3 calcium atoms, 2 phosphate atoms and 8 O atoms in it also rate this and pls thank me follow and as as many questions as you need.
Guys i need help because its due today.
Answer:
204.6 K
Explanation:
PV = nRT
5.6 (12) = 4 (.0821)T
67.2 = .3284T
204.6 = T
How many grams are in 3.1 moles of H2SO4?
Answer:
98.07848 grams.
Explanation:
Empirical formula for S3O9
Answer:
* The empirical formula of a compound shows the ratio of elements present in a compound
* The molecular formula of a compound shows how many atoms of each element are present in a molecule of a compound.
Example: the compound butene has a molecular formula of C4H8. The empirical formula
of butene is CH2 because there is a 1:2 ratio of carbon atoms to hydrogen atoms.
which question is the student most likely trying to answer?
Answer:
B in my opinion
Explanation:
Answer:
I would say A. perhaps B but I'm leaning towards a.
what fraction of 2 years is 10 months
Answer:
10/24
Simplified: 5/12
Explanation:
Well first, let's convert years into months
1 year = 12 months which means 2 years = 24 months
In fraction form we would write this as 10/24
If the question asks for it to be simplified, then simply
Both 10 and 24 evenly fit 2
Therefore, divide both the numerator and the denominator by 2
10 ÷ 2 / 24 ÷ 2
5/12
This can no longer be simplified
The specific gravity of crude oil is 0.876. If 1.00 liter of water weighs 1.00 kilograms, what is the weight of a liter of crude oil ( show work)
0.876 kg or 1.14kg
I need to know this too. Hopefully someone answers quick lol
The specific gravity of crude oil is 0.876 as 1.00 liter of water weighs 1.00 kilograms. Then weight of crude oil is 0.876 kg.
What is specific gravity?A specific gravity is a dimensionless quantity and it is defined as the ratio of density of substance to the density of water.
It is used to determine where the object will float on the surface of liquid approximately.
As, density = mass / volume
Volume of water is 1 ml given.
So, density of substance = mass of substance
Specific gravity = density of substance / density of water
So, Specific gravity = mass of substance / density of water
Mass of substance = specific gravity x density of water
= 0.876 x 1.00 kg = 0.876 kg
Thus, the specific gravity of crude oil is 0.876 as 1.00 liter of water weighs 1.00 kilograms. Then weight of crude oil is 0.876 kg.
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Which elements make up 95 percent (by weight) of the human body?
3. If you have 2.6 moles of NaI and 3.9 moles of bromine, how many grams of NaBr can be made from this reaction?
Br2 + NaI → NaBr + I2
Answer:
0
Explanation:
What volume of sulfur dioxide, SO2 (at STP), is
produced by the burning of 0.250 mole of sulfur?
S(s) + O2(g) → SO2(g)
Answer:
5.6 L is the final volume for SO₂ at STP condtions
Explanation:
The reaction is: S(s) + O₂ (g) → SO₂ (g)
Ratio for this reaction is 1:1, if we see stoichiometry.
1 mol of sulfur can react to 1 mol of oxygen in orden to produce 1 mol of sulfur dioxide.
Then, 0.250 moles of sulfur can produce 0.250 moles of SO₂.
If we solve this by a rule of three, we can say:
At STP 1 mol occupies 22.4L
Then, 0.250 moles will be contained at (0.250 mol . 22.4L) /1mol = 5.6 L
If we apply the Ideal Gases Law:
P . V = n . R . T
1 atm . V = 0.250 mol . 0.082 . 273K
V = (0.250 mol . 0.082 . 273K) / 1atm → 5.6 L
Answerroweo'gfnagnas;gns;BGr;kv
Explanation:
The less dense the air is, the less
and other gases are available for respiration
A chemist determined by measurements that 0.060 moles of silver participated in a chemical reaction. Calculate the mass of silver that participated in the chemical reaction.
Be sure your answer has the correct number of significant digits.
Answer:
its your first question like imagine your literally so free so dog water like you have no earnings i am first place in fncs you was 6 th where were you your boxed like a fish eat this pump.
Explanation:
The freezing point of pure water is 0.0°C. How many grams of ethylene glycol (C2H6O2) must be mixed in 100.0 g of water to lower the freezing point of the solution to -8.8°C? g
Answer:
17.54 g
Explanation:
the freezing point of the solution to -8.8°C
depression in freezing point = 8.8°C
Molal freezing point depression constant of ethylene glycol Kf = 3.11⁰C /m
ΔTf = Kf x m , m is no of moles of solute per kg of solvent .
Let gram of ethylene glycol required be x .
moles = m / mol weight of ethylene glycol
= x / 62
100 g of water = .1 kg
moles of solute dissolved in 1 kg of water
m = x / 62 x .1
m = 10 x / 62
Using the above equation for depression in freezing point
8.8 = 3.11 x 10 x / 62
x = 17.54 g .
The mass of ethylene glycol required to lower the freezing point is 17.54 g.
The given parameters:
Freezing point of a pure water, = 0⁰CMass of water, m = 100 gFreezing point of the solution, = -8.8⁰CMolar freezing point depression constant of ethylene glycol Kf = 3.11⁰C /m
Let the mass of ethylene glycol required be x .
The number of moles of the ethylene is calculated as follows;
[tex]n = \frac{x}{M} \\\\n = \frac{x}{62 \times 100 g \ of H_2 O}\\\\n = \frac{x}{6.2}[/tex]
Apply the following equation for depression in freezing point as follows;
[tex]\Delta T_f = n Kf\\\\8.8 = 3.11 \times \frac{x}{6.2} \\\\3.11 x = 54.56\\\\x = \frac{54.56}{3.11} \\\\x = 17.54 \ g[/tex]
Thus, the mass of ethylene glycol required to lower the freezing point is 17.54 g.
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Which of the following occurs when glaciers melt?
Answer Choices
1. rising
2. sea levels
3. falling sea levels
4. earthquakes
5. tsunamis
Answer
5.tsunamis
Explanation:
Answer:
OMG i did a whole report about this a very long time ago but the answer is the sea level rises lol
Explanation:
hope this helps :) have a nice day!
Which statement best describes the coriolis effect
The coriolis effect is responsible for many large scale weather patterns. The coriolis force is responsible for the deflection of objects. It is this effect which drive the global wind and ocean circulation patterns. The correct option is C.
What is coriolis effect?The apparent effect produced by a rotating frame of reference is defined as the coriolis effect. This effect occurs when an object moving along a straight path is viewed from a non-fixed frame of reference.
Because of the earth's rotation, when an object moving in a straight path is viewed from earth, it appears to lose its course. So the travelling long distances around the earth appear to move at a curve instead of a straight line due to coriolis effect.
The coriolis effect is found to be strongest near poles and it is absent at the equator. The coriolis force is an apparent force caused by the rotation of earth.
Thus the correct option is C.
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Your question is incomplete, most probably your question was:
Which statement best describes the coriolis effect
A. The oceans that receive more rain have water with lower salinity.
B. Closer to the poles, the temperature of ocean water decreases.
C. The rotation of Earth causes the apparent path of ocean currents
to curve,
D. Ocean water becomes denser the deeper you go underwater.
Attempt 2
Four marbles are made of different metals. Each marble has the same mass, but a different volume. The density of each
metal is given in the table.
Metal
Density (g/mL)
aluminum
2.70
silver
10.5
rhenium
20.8
nickel
8.90
Place the marbles in order from largest to smallest.
Largest
The order of marbles can be Aluminum, Nickel, Silver, and Rhenium.
What is volume?If volume is the amount of three-dimensional space contained by a closed surface, such as the amount of space within a given cube, cylinder, or other three-dimensional shape.
Liquid volume is a way to measure an amount of liquid by describing how much three-dimensional space it occupies.
The mass of something is the amount of stuff it is made of. The volume of an object is the amount of space it usually takes up.
Density provides an easy way to calculate a body's mass from its volume or vice versa.
The mass is equal to the volume multiplied by the density (M = Vd), and the volume is equal to the mass divided by the density (V = M/d).
As per the density given, the volume of aluminum can be 1.11mL, Silver is 0.286mL, Rhenium is 0.144mL, Nickel is 0.337mL.
Thus, the order from largest to smallest will be Aluminum, Nickel, Silver, and Rhenium.
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What is the surface composition of planets in the solar system?
A,. Helium or hydrogen
B,. Rock or gas
C., Rock or water
D,. Water or helium
Answer:
A: Helium or Hydrogen
Explanation:
Terrestrial planets are the 4 inner most planets of the solar system which are mercury, venus, earth, Mars, while the giant planets are the 4 outer most which are Jupiter, Saturn, Uranus and Neptune.
Now, these outer most ones are the surface ones and are surrounded primarily by layers of hydrogen and helium gases.
What is soap? (This is for an assignment called "Chemistry of Soap").
Answer:
Soap is a mixture of sodium salts of various naturally occurring fatty acids. ... Soap is produced by a saponification or basic hydrolysis reaction of a fat or oil. Currently, sodium carbonate or sodium hydroxide is used to neutralize the fatty acid and convert it to the salt.
Explanation:
I hope this helps! ^^
☁️☁️☁️☁️☁️☁️☁️
Answer:
Soap is a salt of a fatty acid used in a variety of cleansing and lubricating products. In a domestic setting, soaps are surfactants usually used for washing, bathing, and other types of housekeeping. In industrial settings, soaps are used as thickeners, components of some lubricants, and precursors to catalysts