Answer:
ΔH = -29.78 KJ/mol
Explanation:
To calculate the Standard enthalpy of change for this reaction, we need to use the following expression:
ΔH = ΔHf(products) - ΔHf(reactants) (1)
Now, the standard heat of formation can be found in different handbooks or websites. I manage to find these for the compounds of the reaction:
ΔHf Ca(OH)₂ = -1002.82 KJ/mol
ΔHf HCl = -167.4 KJ/mol
ΔHf CaCl₂ = -795.8 KJ/mol
ΔHf H₂O = -285.8 KJ/mol
With these values, we can calculate the enthalpy change of the reaction using (1). Let's calculate first the individual values of the products and reactants and then, we can use (1):
Reaction: Ca(OH)₂ + 2HCl ---------> CaCl₂ + 2H₂O
ΔHf (products) = ΔHf CaCl₂ + ΔHf H₂O
ΔHf (products) = (-795.8) + 2(-285.8)
ΔHf (products) = -1367.4 KJ/mol
Keep in mind that if the compound has a coefficient that balances the reaction, you need to multiply that number by the standard heat. Let's calculate reactants:
ΔHf (reactants) = ΔHf Ca(OH)₂ + ΔHf HCl
ΔHf (reactants) = (-1002.82) + 2(-167.4)
ΔHf (reactants) = -1337.62 KJ/mol
Finally using expression (1) we have:
ΔH = (-1367.4) - (-1337.22)
ΔH = -29.78 KJ/molWhat happens when there is a cluster of sunspots?
Answer:
a cluster of sunspots will results in extreme solar flares that can cause mass disruption of electronics on earth.
Be sure to answer all parts.
A slice of cheese has a mass of 67 g and a volume of 35 cm'. What is the density of the cheese in units of
g/cm² and g/mL?
Answer:
d = 1.91 g/cm³
d = 1.91 g/mL
Explanation:
Given data:
Mass of cheese = 67 g
Volume of cheese = 35 cm³
Density of cheese = ?
Solution:
Formula:
d = m/v
by putting values,
d = 67 g/ 35 cm³
d = 1.91 g/cm³
1cm³ = 1mL
d = 1.91 g/mL
WHAT ELEMENT IS THIS
Answer: emission spectrum
Explanation:
What is the mass, in kg, of a 2.12-g piece of lead
Answer:
0.00212 kgs
Explanation:
one gram is equal to 0.001 kilograms
Which metal can be extracted from bauxite ore?
Answer:
Aluminum can be extracted from bauxite ore.
Calculate the H3O+ concentration and then pH in a 0.100 M HC2H3O2 solution that is
1.34% loniped?
HC2H3O2(aq) + H2O(l) > H30(aq) + C2H302- (aq)
Answer:
Please check with the attachment posted.
Please do confirm the answer.
Consider the production of sulfur trioxide from sulfur dioxide and oxygen gas:How many grams of sulfur dioxide reacted if 163 kilojoules of heat were evolved in an experiment
Answer:
102.4 g
Explanation:
The equation of the reaction is;
2SO2(g) + O2(g) -----> 2SO3(g) --------ΔH = -198 KJ/mol
Now, given that;
If 2 moles of SO2 evolves 198 KJ/mol of heat
x moles of SO2 evolves 163 KJ/mol of heat
x = 2 * 163/198
x = 1.6 moles of SO2
molar mass of SO2 = 64 g/mol
mass of SO2 = 1.6 moles * 64 g/mol = 102.4 g
HELP PLEASE
convert 2.45 • 10^21 formula unit of ammonium sulfate to moles
Answer:
0.0041 mol
Explanation:
Given data:
Number of formula units = 2.45 × 10²¹ formula units
Number of moles = ?
Solution:
The given problem will solve by using Avogadro number.
It is the number of atoms , ions ,formula units and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance. The number 6.022 × 10²³ is called Avogadro number.
1 mole = 6.022 × 10²³ formula units
2.45 × 10²¹ formula units × 1 mol / 6.022 × 10²³ formula units
0.41 × 10⁻² mol
0.0041 mol
PLSSSSSSSSSS HELP!!! I REALLY NEED IT SO MUCH :( I PROMICE TO GIVE BRAINLIEST AND FIVE STARS AND A THANKS! 6TH GRADE SCIENCE! i used all my points for this!
You measure the mass of an apple using a balance. You get these three measurements:
Trial 1: 167.0 g
Trial 2: 166.9 g
Trial 3: 167.2 g
You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer.
Answer:
100 POINTS! (50 split up) PLSSSSSSSSSS HELP!!! I REALLY NEED IT SO MUCH :( I PROMICE TO GIVE BRAINLIEST AND FIVE STARS AND A THANKS! 6TH GRADE SCIENCE! i used all my points for this!
You measure the mass of an apple using a balance. You get these three measurements:
Trial 1: 167.0 g
Trial 2: 166.9 g
Trial 3: 167.2 g
You know that the true mass of the apple is 172 g. Describe your results in terms of precision and accuracy. Explain your answer in a paragraph for the best grade.
Explanation:
Give 5 examples of limiting factors
Answer:biotic, like food, mates, and competition with other organisms for resources.
Explanation:
Explain oscillation
Pls help ty!
Answer:regular variation in magnitude or position around a central point. Or movement back and forth at a regular speed
Explanation:
Answer:
movement back and forth at a regular speed
Explanation:
they be oscillatin
question: convert 22.63 miles of oxygen to volume
very urgent
Answer:
506.912 L
Explanation:
From the question given above, the following data were obtained:
Number of mole of O₂ = 22.63 moles
Volume of O₂ =?
Recall:
1 mole of a gas occupy 22.4 L at STP.
With the above information, we obtained the volume occupied by 22.63 moles of O₂ as follow:
1 mole of O₂ occupied 22.4 L at STP.
Therefore, 22.63 moles of O₂ will occupy = 22.63 × 22.4 = 506.912 L at STP.
Thus, 22.63 moles of O₂ is equivalent to 506.912 L.
Which wave can travel in both empty space and matter?
(10 Points)
A. radio
B. seismic
C. sound
D. water
Seismic waves can move through both empty space and matter. Electromagnetic waves differ from sound waves in this regard because they do not require molecules to move.
What are earthquake waves?Seismic waves are waves that pass through or over the Earth. They can also be caused by explosions, volcanoes, landslides, and earthquakes, which are movements of the Earth's tectonic plates. They can reveal a lot about the Earth's composition. Earthquakes are caused by sudden movement along Earth's fault lines. Seismic waves, which cause damage by traveling through the Earth, are created when movement releases energy from the "elastic strain" that has been stored.This means that electromagnetic waves can travel through solid materials like air as well as across space. Astronauts use radios in this manner to communicate while on spacewalks. Radio waves are an example of an electromagnetic wave.To learn more about earthquake waves refer to:
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What temperature change in °C is produced when 4430 Joules are absorbed by 237 grams of water?
Answer:
4.46 °C
Explanation:
Step 1: Given and required data
Energy absorbed (Q): 4430 JMass of water (m): 237 gSpecific heat of water (c): 4.186 J/g.°CStep 2: Calculate the temperature change
We will use the following expression.
Q = c × m × ΔT
ΔT = Q / c × m
ΔT = 4430 J / (4.186 J/g.°C) × 237 g
ΔT = 4.46 °C
The temperature change is 4.46 °C.
Using the following equation: 3H2SO4 + 2Fe - +Fe2(SO4)3 + 3H2
How many moles of H2SO4 will react with 8 moles of Fe?
Answer:
12 moles of H₂SO₄
Explanation:
The reaction equation is given as;
3H₂SO₄ + 2Fe⁻ → Fe₂(SO₄)₃ + 3H₂
From the balanced reaction equation:
Number of moles of Fe = 8moles
So;
2 mole of Fe will react with 3 moles of H₂SO₄
8 moles of Fe will therefore yield [tex]\frac{8 x 3}{2}[/tex] = 12 moles of H₂SO₄
Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the
correct position in the answer box. Release your mouse button when the item is place. If you change your mind, drag
the item to the trashcan. Click the trashcan to clear all your answers.
Add the following polynomials, then place the answer in the proper location on the grid. Write the answer in descending
powers of x.
Find the sum of 4x3 + 2x2 - 4x + 3 and 7x3 -4x2 + 7x + 8.
DI
11
3
3
213141516
7890CD.
Answer:
11x³ – 2x² + 3x + 11
Explanation:
From the question given above:
We are to find the sum of:
4x³ + 2x² – 4x + 3 and 7x³ – 4x² + 7x + 8
To add the above polynomials together we must recognise that we can only add like terms together. The sum of the above polynomials can be obtained as follow:
. 4x³ + 2x² – 4x + 3
+ 7x³ – 4x² + 7x + 8
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
= 11x³ – 2x² + 3x + 11
Thus, the sum of 4x³ + 2x² – 4x + 3 and 7x³ – 4x² + 7x + 8 is 11x³ – 2x² + 3x + 11
How many moles of carbon are in 7.00 x 1023 atoms of carbon?
Answer:
1.16 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{7 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{7}{6.02} \\ = 1.162790....[/tex]
We have the final answer as
1.16 molesHope this helps you
Chlorine, iodine, and bromine are located near each other on the periodic table. Which of these elements is the biggest atom?
An avocado has a mass of 215 g and a density of 0.86
g/mL. What is the volume of the avocado?
The volume of avocado here is 250 ml as per the given data i.e., mass of 215 g and a density of 0.86 g/mL.
What is density?The density of an artifact is delineated as its mass divided by the volume. Density is commonly expressed in grams per cubic centimeter.
The grams are a unit of mass and indeed cubic centimeters are a unit of volume. A box with more particles will be denser than a box with fewer particles.
The density of a solid, liquid, or gas illustrates how closely packed the particles can be. The amount of mass per unit volume is defined as density.
Density is defined as d = M/V, where d is density, M is mass, and V is volume. Density is commonly measured in grams per cubic centimetre.
We know that,
Density = mass/volume.
Volume = mass/density.
Here, it is given that
Density = 0.86 g/mL.
Mass = 215 g.
Volume = 215/0.86 mL.
Volume = 250 mL.
Thus, the answer is 250 mL.
For more details regarding density, visit:
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Name the alcohol that would be used in the Fischer esterification synthesis of ethyl propanoate (CH3CH2O2CCH2CH3).
Answer:
Ethanol.
Explanation:
Hello!
In this case, since the Fischer esterification stand for the organic acid-base reactions, we infer that the alcohol is related to the -yl part on the name (ethyl propanoate) as the alcohol is likely to lose the -OH and provide a carbocation for the carboxyl group of the carboxylic acid.
In such a way, since the -yl part is given as ethyl, we infer the used alcohol is ethanol:
[tex]CH_3-CH_2-OH[/tex]
Best regards!
A solid reactant is placed into a beaker of a warm water. The liquid vigorously bubbles as the solid dissolves into the solution. What will most likely happen if the temperature of the liquid is slightly reduced?
Answer:
Fewer bubbles will be produced because of fewer collisions of reactant molecules
Explanation:
As the solid dissolves into the solution after the liquid has been vigorously bubbled, if the temperature of the liquid is reduced a little, what will happen is that fewer bubbles will be produced as a result of lesser amount of collisions occurring between the reactant molecules
A gram of gasoline produces of energy when burned. Gasoline has a density of . How would you calculate the amount of energy produced by burning of gasoline
Answer:
1.66x10⁶kJ of energy are produced
Explanation:
...Produces 45kJ... Has a density of 0.77g/mL... By burning 48L of gasoline...
To solve this question we need to calculate the mass in grams of gasoline in 48L using its density.
With the mass and knowing 1gram produces 45kJ of energy we can find the energy produced by burning 48L of gasoline, thus:
mL of gasoline:
48L * (1000mL / 1L) = 48000mL of gasoline
g of gasoline:
48000mL * (0.77g/mL) = 36960g of gasoline
Energy produced:
36960g of gasoline * (45kJ / g) =
1.66x10⁶kJ of energy are producedwhat is this element
Answer:
Oxygen
Explanation:
From the question given above, the following data were obtained:
Number of electrons = 8
Number of protons = 8
Number of Neutrons = 8
Name of element =?
Next, we shall determine the atomic number of the element. This can be obtained as follow:
The atomic number of an element is simply defined as the number of protons in the atom of the element. Mathematically, it is expressed as:
Atomic number = proton number
From the question given above,
Number of protons = 8
Therefore,
Atomic number = 8
Comparing the atomic number of the element (i.e 8) with those in the periodic table, we can conclude that the element is oxygen since no two elements have the same atomic number.
What is the wavelength of a 229 Hz sound wave moving at a speed of 345 m/s?
Answer:
wave length=speed/frequency
=345/229
These are not able to conduct electricity or heat very well, very brittle (breakable), and cannot be
made into wires or pounded into sheets
Answer:
Nonmetals
Explanation:
Nonmetals typically lacks the metallic bonding which allows substances to exhibit metallic properties that confers special properties on them.
Metals are malleable and ductileThey are also able to conduct electricity due to the sea of electrons present within their structure. Metals can be made into wire and drawn into sheets.Nonmetals lacks these properties but metalloids are able to show some of the properties under certain and special conditions.
All of the orbitals in a given subshell have the same value of the __________ quantum number
Answer:
magnetic spin
Explanation:
the magnetic spin quantum number i.e + 1/2 or-1/2 ...those are all the orbitals in agiven shell simolarly contains it
Answer:
principal
Explanation:
The quantum numbers that are used in the identification of an electron are n, l, m, and s.
n= principle quantum number
l= azimuthal quantum number
m= magnetic quantum number
s= spin quantum number
All the orbitals in a given subshell have the same value of n(principle quantum number) and l( azimuthal quantum number).
PLEASE! need help now please!
Answer:
• The closing of the frontier
Explanation:
• The closing of the frontier• The closing of the frontier• The closing of the frontier• The closing of the frontier• The closing of the frontier• The closing of the frontier• The closing of the frontier
6) Mendeleev put the elements on the periodic table in the order of how
many
it has. *
O electrons
O neutrons
O protons
Answer: Protons
Explanation:
which statement best describes the process of photosynthesis
A. it is the process of producing fruits. B. it is the process of relesing carbon dioxide C.it is the process of converting energy and producing and producing food D.it is the process of absorbing water and releasing nitrogen.
The table above this place up icicle properties of a diamond by the property names have been left out of the top row which property belongs in column one
Answer:
icicle becausit sounds right
Explanation:
icicles because it sounds right