The enthalpy ΔH of combustion is - 804 kJ. The change in internal energy ΔE of the reaction process is -801 kJ
The objective of this question is to determine the value of ΔH and ΔE of combustion is for 1 mole of methane.
If we look closely at the question, we will realize that at constant pressure, methane burns and produces heat of 804 kJ into the surroundings.
Since heat is released;
ΔH = -804 kJ
It also does a work of 3kJ, since work is done on the system
W = - 3kJ
According to the first law of thermodynamics;
ΔE = ΔH - W
ΔE = (-804 - (-3 )) kJ
ΔE = -801 kJ
Therefore, we can conclude that the in 1 mole of methane, the enthalpy ΔH of combustion is - 804 kJ. The change in internal energy ΔE of the reaction process is -801 kJ
Learn more about first law of thermodynamics here
https://brainly.com/question/3808473?referrer=searchResults
Which of the following do not have angular momentum? Choose all that apply: O A. A spinning planet O B. A boy sleeping in bed O C. A ball sitting in a garbage can O D. A Ferris wheel in motion
Answer:
The answer is A and B
Explanation:
The diagram shows the box for elements in the periodic table. What is the atomic number of the element shown. A. 27.0 B. 40.0 C.26 D.13
I think it is B.40.0
Because if you do 27+13=40
It will give 0.
[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
The atomic number of the shown element Al (Alluminium) is ~
[tex]13[/tex]Explanation:
atomic number = no. of protons = 13
therefore atomic number of aluminium is 13 as given
so option D 13 is correct option .
hope this answer helps you dear! take care
How many atoms...
NAC2H3O2
Answer:
one Sodium (Na) atom, two oxygen (O) atoms, two carbon (C) atoms, and three hydrogens (H) atoms
Explanation:
A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400. mL of a solution that has a concentration of Na ions of 1.00 M
Answer:
21.86 grams
Explanation:
It is important to note that for every mol of Na3PO4 there is, 3 mols of Na ions are produced.
Na+=1m(0.4l), so mols of Na3PO4= 0.4/3= 0.13333... mols
the molar mass of Na3PO4 is 163.94 grams/mol. 0.1333*163.94=21.86 grams of Na3PO4.
Hi I of the following compounds is an aldehyde?
Answer:
cpd 2
Explanation:
aldehyde is such a cpd which contains an alkyle gp with the formula R-CH=O
Functional group can be interconverted into each other by the means of suitable reagent. Functional group are responsible for the chemical and physical properties of a compound. Therefore the correct option is option 2 that is having group R-CHO.
What is functional group?A group of atoms forming a component of a molecule that accounts for a particular function or chemical behavior is called a functional group. There are so many functional group in organic chemistry.
The list of functional groups with their corresponding formulas can be given as
Carboxylic group COOH
Alcoholic group OH
Ammine group NH₂
Ketonic group R-CO_R
Aldehydic group R-CHO
Thiol group R-S-H
Cyanide group -CN
Therefore the correct option is option 2 that is having group R-CHO.
To know more about functional group, here:
https://brainly.com/question/14618322
#SPJ2
How do the elements beryllium, carbon, and oxygen produce stars such as the Sun?
Answer:
Beryllium, carbon, and oxygen do not create stars like the sun. The sun is a massive cluster of hydrogen atoms being fused into helium atoms and heavier metals like Beryllium, carbon, and oxygen through the process of nuclear fusion. The more mass a star has in its core the more fusions that can occur and the heavier the metals inside can be fused into.
Explanation:
hope this helps. . . <3
good luck! uωu
cm 5. Express the result of adding 856.6g and 23.86g to the correct number of significant figures.
Answer:
880.5
Explanation:
Express the result of adding 856.6g and 23.86g to the correct number of significant figures.
856.6 +23.86 = 856.6 + 23.9 = 880.5
The result of adding 856.6 g and 23.86 g after rounding off to correct significant figures is 856.6 + 23.9=880.5.
What are significant figures?Significant figures are used for establishment of a number which is presented in the form of digits. These digits give a meaningful representation to the numbers.
The significant figures are the significant digits which convey the meaning according to the accuracy. These provide precision to the numbers and hence are called as significant numbers.There are rules for counting significant figures which are as follows:
1)All non-zero digits are significant .
2)All zeroes which occur between non-zero digits are significant.
3)All zeroes to the left and right of a non-zero digit are not significant.
4) All zeroes on right of decimal are significant if a non-zero number follows them.
5)All zeroes on right side of non-zero digit are significant.
Learn more about significant figures,here:
https://brainly.com/question/29153641
#SPJ2
375cm3 of a gas has a pressure of 770 mm Hg, find it Volume if the pressure is reduced to 750 mm Hg
Answer:
385 cm^3
Explanation:
375cm3 of a gas has a pressure of 770 mm Hg, find it Volume if the pressure is reduced to 750 mm Hg
if we reduce the pressure, the volume increase since since PV is constant
so the new volume = 0.375 cm^3 X 770/750 = 385 cm^3
63
Using the metric "stairs" convert the following:
which one is not allotropes of carbon?
Answer:
B. Activated Carbon
Explanation:
What is the expression for the equilibrium constant for the
reaction N2+ 3H2 = 2NH3?
Answer:
For the reaction N2 + 3H2 2NH3 , the equilibrium expression may be written as K [ NH3 ]^2/ [ N2 ] [ H2 ]^3 .
Explanation:
Answer:
s K [ NH3 ]^2/ [ N2 ] [ H2 ]^3 .
Explanation:
because I know -_-
How many grams of sodium chloride are dissolved in 375 ml of a 0.90% saline solution?
Answer:
337.5 g NaCl
Explanation:
.90% saline solution = 90g saline (NaCl)/100mL water (H2O)
1. Use 375 mL to find mass
375 mL × (90 g NaCl/100 mL) = 337.5 g NaCl in 375 mL .9% saline solution
The amount of sodium chloride dissolved in 375 ml of a 0.90% saline solution is 337.5 g.
What is the concentration of the solution?The concentration can be calculated when we have the molecular formula and its molecular weight. The concentration of the solution is calculated as the weight of a solute divided by the volume of the solution.
The weight/volume percentage of the solution is determined in the following way.
W/v (%) = weight of the solute/Volume of the Solution ( in mL)
Given, the concentration of the saline solution = 0.90 %
0.90 % saline solution means 90 g of NaCl is dissolved in 100 ml of water.
Given, the volume of solution = 375 ml
100 ml of saline solution containing NaCl = 90 g
Then 375 ml of saline solution containing NaCl = 90 ×375/100 = 337.5 g
Therefore, the amount of NaCl is equal to 337.5 g.
Learn more about molar concentration, here:
brainly.com/question/21841645
#SPJ2
draw clear, colorful and understandable diagrams of the metabolism of carbohydrates and lipids?
(you can have 2 separate ones, or you can combine them into one)
Answer:
Refer to the attachments!!
Explanation:
8) What mass of chlorine reacts with 20.0 g of iron to form iron(III) chloride?
Answer:
38.3 g
Explanation:
8) What mass of chlorine reacts with 20.0 g of iron to form iron(III) chloride?
first write, then balance the equation
Fe + Cl2-------------> FeCl3
2Fe + 3Cl2----------> 2FeCl3
2 moles of Fe require 3 moles of Cl2
the atomic mass of Fe is 56
20/56= 0.36 moles of Fe
this requires o.36 X 3/2 = 0.54 moles of Cl2
Cl2 has a molar mass of 35.5 X 2=71
1 mole of Cl2 is 71g
0.54 moles is 0.54 X 71 g= 38.3 g
The mass of chlorine reacts with 20.0 g of iron to form iron(III) chloride is 38.3 g.
What is mass?Mass is defined as a numerical representation of the fundamental characteristic of all matter, inertia.
It can also be defined as a dimensionless number used to describe the mass of a particle or item.
[tex]\rm 2Fe + 3Cl_2\rightarrow2FeCl_3[/tex]
As per the reaction 3 mole of chlorine is required for 2 mole of fluorine.
Atomic mass of fluorine = 56
Moles of Fe = 20 / 56
= 0.36 moles
This require 0.36 x 3/2 = 0.54 moles of Cl₂
Molar mass of Cl = 35.5
So for Cl₂ = 2 x 35.5 = 71 moles
For 1 mole of Cl₂ = 71 moles is needed
So, for 0.54 moles = 71 x 0.54
= 38.3 g
Thus, the mass of chlorine reacts with 20.0 g of iron to form iron(III) chloride is 38.3 g.
To learn more about mass, refer to the link below:
https://brainly.com/question/19694949
#SPJ2
What happens to the kinetic energy of the bowling ball when it reaches the pins?
Answer:
The bowling ball has kinetic energy as it moves toward the pins.
Explanation:
Answer:
Most of it is transferred to the pins, but some of it is changed into heat and sound energy.
Explanation:
study island
PLEASE ANSWER WITHIN THIS HOUR!
Which of the following does NOT describe the epidermis?
A. It is waterproof.
B. It houses the sweat and oil glands.
C. It is the outermost layer of the skin.
D. Its surface consists of dead cells that continually shed off.
Thank you!
Answer:
it doesn't house the sweat and oil glands
Explanation:
the epidermis doesn't house the oil and sweat glands but the dermis does
Did all the silver ions get consumed in the reaction? The molar mass of silver is 107.87 g/mol. Justify your answer.
This problem is asking for the consumption of silver ions when silver nitrate is reacted with copper. In such a case, since no masses are given, we can use the following from similar problems:
Mass of empty beaker: 110.000 g
Mass of beaker with silver nitrate (after all additions) and copper: 331.634 g.
Mass of beaker with silver: 113.395 g.
This means we can write the following chemical equation:
[tex]Cu+2AgNO_3\rightarrow Cu(NO_3)_2+2Ag[/tex]
And thus calculate the mass of silver nitrate that will produce the following mass of silver:
[tex]m_{Ag}^{produced}=113.395g-110.000g=3.395g[/tex]
Next, we use the 2:2 mole ratio of silver to silver nitrate (silver ions source):
[tex]3.395gAg*\frac{1molAg}{107.87gAg}*\frac{2molAgNO_3}{2molAg} *\frac{169.87gAgNO_3}{1molAgNO_3} = 5.35gAgNO_3[/tex]
The step will be defined for the given mass of available silver nitrate which will be compared to 5.35 g (consumed mass) to see if they are the same (all consumed) or different (partial consumption).
Learn more:
https://brainly.com/question/22031122https://brainly.com/question/2607181https://brainly.com/question/16965188Consider the following chemical equation:
C2H8 + O2 --> CO2 + H2O
Which of the following would be the best practice(s) for balancing the equation? There may or may not be more than one correct answer.
A.Reduce the coefficients if possible.
B.Put a 2 in front of the hydrocarbon.
C.Split the hydrocarbon into individual elements.
D.Split the water into HOH.
E.Keep the hydrocarbon together.
The best way to balancing a combustion equation of an organic compound, like the one in the question, is to start balancing the carbon, then the hydrogen and finish with the oxygen. For that you have to split the hydrocarbon into individual elements. And once you have finished you shall always try to reduce the coefficient if possible. Therefore, the answers are A. and C.
Which of these is the condensed structural formula for an alkane with four carbon
atoms?
O CH3CH2CH2CH3
H
HLH
1C
H
C2
LH
I
C
HTH Н
H
0-I
I
क
H
OCH3CHCHCH3
OC-C-C-C
Answer:
First option
Explanation:
The option that says CH3CH2CH2CH3 is the correct option (I hope that I am right because the order of the answers is not very clear :/)
How many carbon (C) atoms are in C3Hg? A. 8 B. 5 C. 1 D. 3
Answer:
the answer is D
what are the strongest acids and bases in chemstry
When 0.005 moles of silver(1) nitrate reacts with sodium carbonate, which of the following statement is correct?
(You must show all your work)
A) This is a redox reaction
B) This is a precipitation reaction and 0.69 g of the precipitate will be formed
C) This is a precipitation reaction and 1.38 g of the precipitate will be formed
D) This is a precipitation reaction and 0.83 g of the precipitate will be formed
Explanation:
no sé de qué me estás hablando
This is a precipitation reaction and 1.38 g of the precipitate will be formed is the statement is correct. Hence, option C is correct.
What is a precipitation reaction?A precipitation reaction is when two or more dissolved chemicals combine to form one solid products. The exchange of ions between ionic compounds in aqueous solutions is a common component of these reactions, which are also occasionally referred to as double displacement, double replacement, or metathesis reactions.
in response to precipitation a process that converts soluble salts into solids that are insoluble in water. a neutralizing response an interaction between an acid and a base that results in the production of salt, water, and an ionic molecule.
Precipitate refers to a solid that forms from a solution. The blending of two transparent solutions is a common example: NaCl in combination with silver nitrate The answer is. The soli cannot be dissolved in water.
Thus, option C is correct.
For more information about precipitation reaction, click here:
https://brainly.com/question/24158764
#SPJ2
13500 mL convert to milliliters of mercury
Answer:approximately 5.627 × 1019 milliliters
Explanation:
Why is there an octet rule in writing Lewis structures?
Answer:
Before we can sketch the Lewis structures of molecules, we must first understand the octet rule. The octet rule asserts that when atoms combine to create compounds, electrons are gained, lost, or shared among them, resulting in a stable electron configuration defined by eight valence electrons as a result. These rules are used in conjunction with the main-group components of the second period.
Explanation:
Hope it helps:)
a hot air balloon has a volume of 875L. what is the original temperature of the balloon if its volume changes to 955 L when heated to 56
Answer:
using Charles law
v1/t1= v2/ t2
Explanation:
875/t1=955/56+273
t1= 329* 875/955
t1= 302.82k
The initial temperature of the hot air balloon can be calculated from Charles's law. The initial temperature of the balloon was, 51.3 °C.
What is Charles's law?According Charles's law, at constant pressure, the temperature and volume of a gas is in direct proportionality. Thus volume increases with an increase in temperature. Therefore V/T = a constant.
Let V₁ and T₁ be the initial volume and initial temperature and V₂ and T₂ be the final volume and temperature respectively. Thus we can write the relation as:
V₁ /T₁ = V₂/T₂ .
Given that the initial and final volume are 875 L and 955 L respectively. The final temperature is 56 °C. Thus the initial temperature is calculated as :
T₁ = V₁T₂/V₂
= (875 L × 56 °C )/955 L
= 51.3 °C.
Hence, the initial temperature of the hot air balloon was 51.3 °C.
To find more on Charles's law, refer here:
https://brainly.com/question/16927784
#SPJ5
Fill in the the correct term to complete the sentence provided. The ______ produces chemical changes to provide energy.
Answer:
chemical reaction
Explanation:
The chemical reaction produces chemical changes to provide energy. Chemical reactions often involve changes in energy due to the breaking and formation of bonds.
Nancy rides her bike 114.8 miles in 8.2 hours. What is her average speed in miles per hour
The answer to the question is 14 no cap
Stems are important plant structures because they _________.
A.
are the main sites of photosynthesis for plants
B.
are the only site of water and nutrient transport
C.
allow plants to absorb water and nutrients from the soil
D.
give the plant structure and support
Answer:
D
Explanation:
Answer:
for plato users, the answer is: give the plant structure and support
If aqueous solutions of Na2CO3 and BaCl2 are mixed, which insoluble precipitate is formed?
Answer:
barium chloride (BaCl2) is added to sodium carbonate (Na2CO3). The result is a white precipitate.
Explanation:
According to VSEPR theory, a molecule with the general formula AX2E2 (A is the central atom, X is the bonded atom and E is a lone pair of electrons) has how many regions of electron density around the central atom [ Select ]
Answer:
see explanation
Explanation:
An AX₂E₂ geometry is derived from an AX₄ parent geometry and is based upon 4 regions of electron density about the central element and defines a tetrahedral geometry and the geometry is bent angular.
An example is the water molecule (H₂O) with two covalent O - H bonds and two free pair electrons on the central oxygen element.