Answers
Answer: The enthalpy change for formation of butane is -125 kJ/mol
Explanation:
The balanced chemical reaction is,
[tex]C_4H_{10}(g)+\frac{13}{2}O_2(g)\rightarrow 4CO_2(g)+5H_2O(l)[/tex]
The expression for enthalpy change is,
[tex]\Delta H=[n\times H_f{products}]-[n\times H_f{reactants}][/tex]
Putting the values we get :
[tex]\Delta H=[4\times H_f_{CO_2}+5\times H_f_{H_2O}]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times H_f_{O_2}][/tex]
[tex]-2877=[(4\times -393)+(5\times -286)]-[1\times H_f_{C_4H_{10}}+\frac{13}{2}\times 0][/tex]
[tex]H_f_{C_4H_{10}=-125kJ/mol[/tex]
Thus enthalpy change for formation of butane is -125 kJ/mol
Related Questions
Explain why it is necessary to use a mixture, alumina and cryolite, rather than just
alumina
Answers
Explanation:
The mixture of cryolite and aluminium oxide has a lower melting point than pure aluminium oxide. This means a lower amount of energy is required to establish effective conditions for electrolysis and thus makes it more cost effective.
What is the only natural way that carbon can move OUT of the geosphere?
burning of fossil fuels
volcanic eruptions
dissolution
decomposition
Answers
Answer:
volcanic eruptions
Explanation:
which substances corrode copper?
Answers
Copper corrodes at insignificant rates when used in areas with unpolluted air, non-oxidizing acids, and water. However, it happens more rapidly with the presence of road salt, ammonia, sulfur, oxidizing acids
Acidic substances react with the surface of copper, causing it to tarnish and corrode almost instantly. This corrosion is highly soluble, leading to the presence of toxic copper salts in the food. This is why it is not recommended to use copper vessels for foods high in acidity, such as milk, wine, or vinegar.
The smallest part of a compound that still has the properties of that compound is a(n)
OA. orbital.
ОВ.
molecule
OC.
mixture
OD.
nucleus.
Answers
a molecule is the smallest particle of a compound is still has the compounds property it consists of two or more atoms bonded together
1. List 3 physical and chemical phenomena
Answers
Answer:
Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input.
Hope this helped.
CH4+2 O2-> CO2 + 2 H2O
You burned 15.0 grams of methane (CH4) in an excess of oxygen and formed 23.8 grams of water. What was your percent yield, rounded to 3 sig-figs?
C= 12.001 g/mol
H= 1.008 g/mol
O= 16g/mol
Answers
From the chemical equation it is clear that, one mole or 16 g of methane gas gives 2 moles or 36 g of water. Then, 15 g gives 33.7 g of water. The actual yield is 23.8 g. Then the percent yield is 70.6%.
What is percent yield of a reaction?Percent yield of a reaction is the ratio of its actual yield to the theoretical yield multiplied by 100. The theoretical yield is calculated from the balanced chemical equation of the reaction.
molar mass of methane gas = 16 g/mol
molar mass of water = 18 g/mol
16 g of methane gives 2 moles or 36 g of water. Then 15 g of methane will gives:
(15×36)/16 = 33.7g
The actual yield of water = 23.8 g
then,
percent yield = 23.8 g/33.7 g × 100 = 70.6%.
Therefore, the percent yield of water is 70.6%.
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What type of reaction is...
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l)
a. combustion
b. single replacement
c. synthesis
d. double replacement
e. decomposition
Answers
Answer:
d: double replacement
Explanation:
We have that for the Question "What type of reaction is...
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l)
" it can be said that
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l) is a decomposition reaction
Option E
From the question we are told
What type of reaction is...
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l)
a. combustion
b. single replacement
c. synthesis
d. double replacement
e. decomposition
Generally
We have that a combustion is a reaction with oxygen to release energy a
it is in the form of
[tex]X+0_2 ---CO_2+H_2O[/tex]
double replacement
in this reaction two ionic compounds share ions to create two variant compounds with the same amount of ions
decomposition
This occurs when a compound is broken down into smaller compounds
Therefore
(NH4)2CO3(aq) → NH3(g) + CO2(g) + H2O(l) is a decomposition reaction
Option E
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Think of a real-life situation in which measuring work and power would be important
Answers
Answer:
Being a CEO holds a lot of power and work but, you would need to be able to manage thus power to be able to keep your company running in good hands. work comes in because as a ceo you'll obviously have lots of work but you'll also have employees all of which assist you with managing work
Which change does not increase the speed of reaction between zinc and hydrochloric acid?
Answers
If you want a more quantitative analysis of reaction rate, you can perform the experiment in a eudiometer tube that is inverted and completely filled with liquid. As the hydrogen gas collects in the tube you can measure its accumulated volume with time. That will allow you to determine an approximate kinetic rate law for the process. The rate law determined in this manner will suffer from error due to temperature and surface area changes as well as gas volume error due to water vapor. But, it is an interesting application of chemical kinetics.
By adding the decreasing the temperature, the speed of the reaction will not be increased.
What is speed of the reaction ?The reaction rate, which is a measure of how quickly reactants are consumed as well as products are created, determines the speed of a reaction.
When the temperature is lowered, the molecules move more slowly and collide less. The reaction's speed is slowed as the temperature drops.
Therefore, by adding the decreasing the temperature, the speed of the reaction will not be increased.
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The star betelgeuse is 325 light years away. If it were to explode in a supernova tonight, would we know? Explain your answer.
Answers
Answer:
We will not know immediately
Explanation:
The distance of star Betelgeuse = 325 light years
Therefore, if it where to explode, at the location, we would have a supernovae such that the luminosity of the star multiplies several multiple times
However, due to the distance of Betelgeuse from the Earth, it will take the light of the explosion, 325 years to reach Earth and the explosion as it happens will not be noticed here on Earth immediately
the number of ___ in an atom tells you how many chemical bonds that atom can form
Answers
if a magnet is broken which one of the following remains unchanged in each part mass, magnetisation, length
Answers
Explanation:
magnetization
coz it will still have two pols that is north and south pole
determine the velocity of a cart traveling at 135cm in 5.5s.
Answers
distance = 135cm
time = 5.5 s
velocity = 135 cm/5.5 s
velocity = 24.546 cm/s
Answer: 0.245 m/s
Explanation:
So velocity = d/t or distance over time in this case m/s or meters per second. But BE CAREFUL you must remember to convert cm to m always so 135 cm= 1.35m and 1.35m/5.5s= 0.245m/s
what provides support and transportation of materials for a plant
Answers
Answer: Xylem is the tissue responsible for supporting the plant as well as for the storage and long-distance transport of water and nutrients, including the transfer of water-soluble growth factors from the organs of synthesis to the target organs.
Explanation:
Answer:
Xylem is the tissue responsible for supporting the plant as well as for the storage and long-distance transport of water and nutrients, including the transfer of water-soluble growth factors from the organs of synthesis to the target organs
Explanation:
Which of the following is a product in the reaction described by the word equation below?
iron + copper(II) sulfate ----------> iron(II) sulfate +copper
Answers
Answer:
Please answer my question
in certain fireworks potassium nitrite breaks down into potassium oxide, nitrogen and oxygen. This is an example of a _________ reaction. The opposite process is a ________ reaction.
options for both blank spots are the same.
A. combustion
B. decomposition
C. replacement
D. synthesis
Select the correct answer from each drop down menu.
HELLLPPPP PLEEASEE!!!!
Answers
How is my drawing. Rate it on a scale of 1-10
Answers
Answer:
I rate it 10/10
Explanation:
I like it. :)
Answer:
I think 8.5 it looks cool
PLEASE HELP ME. REAL ANSWERS ONLY PLZ
Answers
Answer:
Please make it full I'm not seeing it
A 5.00 L flask contains 7.94 g of a gas at STP. What is the molar mass of the gas?
Answers
Answer: 35.6 g/mol
Explanation: I guessed and got it correct
The molar volume of any gas behaving ideally at STP is 22.414 L. The molar mass of the gas at STP is 35.59 g.
What is molar mass?The molar mass of a substance is defined as the mass of one mole of molecules. In other words one gram molecular mass of a substance is same to its molar mass in g mol⁻¹.
The molar mass of a substance can be obtained by adding the atomic masses of each elements. At 0°C and 1 atm, 1 mole of any gas behaving ideally occupies a volume of 22.414 L.
Here 5.00 L of the gas at STP has a mass of 7.94. Then the molar mass of 22.414 liters of the gas can be calculated as:
7.94 × 22.414/5.00 = 35.59 g.
Thus the molar mass of the gas is 35.59 g.
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What causes the periodic (recurring)
patterns seen in the periodic table?
Answers
What is the formula unit for a compound made from Li and Cl? (5 points)
LiCl because the total negative charge on Cl is one.
LiCl because the total negative charge on Li is two.
Li2Cl because the total positive charge on Cl is one.
Li2Cl because the total positive charge on Li is two.
Answers
Answer:
LiCl because the total negative charge on Cl is one.
Explanation:
Lithium has a charge of 1+ and Chlorine has a charge of 1-.
There are two types of chemical compound one is covalent compound and other is ionic compound. LiCl because the total negative charge on Cl is one. The correct option is option A.
What is chemical Compound?
Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
Covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Ionic compounds are hard, these have higher melting and boiling point than the covalent compounds. Li act as cation Li⁺ and Cl act as Cl⁻. These two combine to form LiCl. LiCl is an ionic compound.
Therefore, LiCl because the total negative charge on Cl is one. The correct option is option A.
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When solid calcium carbonate (CaCO3) is heated, it decomposes to form solid calcium oxide (CaO) and carbon dioxide gas (CO2). How many liters of carbon dioxide will be produced at STP if 2380 g of calcium carbonate reacts completely? CaCO3 (s) CaO (s) + CO2 (g)
Answers
Answer:
533.12 L
Explanation:
The balanced chemical equation for the decomposition of CaCO₃ is the following:
CaCO₃(s) → CaO(s) + CO₂(g)
According to the equation, 1 mol of CaCO₃ produces 1 mol of gas (CO₂). We convert the moles of CaCO₃ to mass in grams with the molar mass of the compound:
molar mass CaCO₃ = 40 g/mol Ca + 12 g/mol C + (3 x 16 g/mol O)= 100 g/mol
mass of CaCO₃ = 1 mol x 100 g/mol = 100 g CaCO₃
Now, we know that 1 mol of any gas at STP occupies a volume of 22.4 L:
1 mol CO₂ = 22.4 L CO₂
Thus, the stoichiometric ratio is: 22.4 L CO₂/100 g CaCO₃
Finally, we multiply this ratio by the mass of CaCO₃ to calculate how many liters of CO₂ at STP are produced:
2380 g CaCO₃ x 22.4 L CO₂/100 g CaCO₃ = 533.12 L
The 533.12 L of carbon dioxide will be produced at STP if 2380 g of calcium carbonate reacts completely.
The balanced chemical equation for the decomposition of CaCO₃ is the following:
CaCO₃(s) → CaO(s) + CO₂(g)
What is a balanced chemical equation?A balanced chemical reaction is an equation that has equal numbers of each type of atom on both sides of the arrow.
According to the equation, 1 mol of CaCO₃ produces 1 mol of gas (CO₂).
We need to convert the moles of CaCO₃ to mass in grams with the molar mass of the compound:
Molar mass CaCO₃ = 100 g/mol
Mass of CaCO₃ = 1 mol x 100 g/mol = 100 g CaCO₃
Now, we know that 1 mol of any gas at STP occupies a volume of 22.4 L:
1 mol CO₂ = 22.4 L CO₂
Thus, the stoichiometric ratio is:
[tex]\frac{22.4 L\; CO_{2} }{100 g \;CaCO_3 }[/tex]
Finally, we multiply this ratio by the mass of CaCO₃ to calculate how many liters of CO₂ at STP are produced:
2380 g CaCO₃ x 22.4 L CO₂/100 g CaCO₃
= 533.12 L
Hence, the 533.12 L of carbon dioxide will be produced at STP if 2380 g of calcium carbonate reacts completely.
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Describe what happens to the light between when it first enters a raindrop and when it comes out of the raindrop. Support your answer with evidence from the text.
Answers
When sunlight enters a raindrop in the air, the light splits into a multitude of colors. This light then reflects off the back of the raindrop and re-emerges in the direction in which the light first entered. The light emerging from many raindrops creates a rainbow.
2)
The IUPAC name for the common household cleaner, ammonia, is nitrogen trihydride. Identify the formula of ammonia.
A)
NH
B)
ΝΗ,
C)
NH
D)
N3H3
Answers
Answer:
The formula of ammonis is given as NH3
Explanation:
The given IUPAC name of ammonia is nitrogen trihydride.
From the name of IUPAC name of the ammonia it is evident that there is only one atom of nitrogen is present in one molecule of ammonia.
Word 'trihydride ' means a that there are three hydrogen atoms present as hydride in one ammonia molecule.
So, the formula of ammonia will be guven as: NH3
Answer:
it's NH3.....
Explanation:
so......
how many moles are in 0.250 g of h20
Answers
Answer:
moles in 0.250 g of h20 is 1.349x10^-2
How many moles of NH3 could you produce with 0.24 moles of H2 and excess nitrogen gas?
Answers
Answer:
[tex]0.16\; \rm mol[/tex].
Explanation:
[tex]\rm H_2[/tex] and [tex]\rm N_2[/tex] react to produce [tex]\rm NH_3[/tex] through the following reaction:
[tex]\rm 2\; N_2 + 3\; H_2 \to 2\; NH_3[/tex].
The ratio between the coefficients and [tex]\rm NH_3[/tex] and [tex]\rm H_2[/tex] is:
[tex]\displaystyle \frac{n({\rm NH_3})}{n({\rm H_2})} = \frac{2}{3}[/tex].
This coefficient ratio would be the ratio between the quantity of [tex]\rm NH_3[/tex] produced and the quantity of [tex]\rm H_2[/tex] consumed in this reaction only if [tex]\rm H_2\![/tex] is a limiting reactant.
The other reactant in this reaction, [tex]\rm N_2[/tex], is in excess. Hence, [tex]\rm H_2[/tex] would be the limiting reactant. Hence, the coefficient ratio could be used to find the quantity of [tex]\rm NH_3[/tex] produced in this reaction.
[tex]\begin{aligned}n({\rm NH_3}) &= \frac{n({\rm NH_3})}{n({\rm H_2})} \cdot n({\rm H_2}) \\ &= \frac{2}{3} \times 0.24\; \rm mol \\ &= 0.16\; \rm mol \end{aligned}[/tex].
Need help with this chemistry problem
Answers
Nitrogen monoxide + oxygen → nitrogen dioxide.
How do.i write that in skeleton equation
Answers
NO + O2 —> NO2
50 g of ice, at 0 oC, is added to 500 g of water at 75 o What is the final temperature? Cice = 2.093 J/g-oC, cH2O = 4.186 J/g-oC.
Answers
Answer:
The final temperature of the mixture is 71.43 ⁰C
Explanation:
Given;
mass of ice, m₀ = 50 g
initial temperature of the ice, t₀ = 0 ⁰C
mass of water, m₁ = 500 g
initial temperature of water, t₁ = 75 ⁰C
specific heat capacity of ice, C₀ = 2.093 J/g⁰C
specific heat capacity of water, C₁ = 4.186 J/g⁰C
Let the final temperature of the mixture = T
The heat lost by the water = The heat gained by the ice
m₁c₁ (75 - T) = m₀c₀ (T - 0)
500 x 4.186 x (75 - T) = 50 x 2.093 x T
156975 - 2093T = 104.65T
156975 = 104.65T + 2093T
156975 = 2197.65T
T = 156975 / 2197.65
T = 71.43 ⁰C
Therefore, the final temperature of the mixture is 71.43 ⁰C
Living organisms contain a variety of specailsed cells name one example of a specialised cell in the body and state its function example : function :
Answers
Answer:
See the answer below
Explanation:
The cell represents the basic unit of life and any living organism.
One example of specialized cells in the body are the sex cells.
The sex cells are primarily concerned with reproduction and perpetuation of life. The cells undergo meiosis to produce haploid gametes. Male and female gametes then fuse together during fertilization to give rise to diploid zygotes which eventually give rise to new organisms.