Answer:
The enthalpy change (∆H) for the reaction is -108.7 kJ
Explanation:
Hess's law can be stated as: when the reactants are converted to products, the enthalpy change is the same, regardless of whether the reaction is carried out in one step or in a series of steps. Then, Hess's Law states that the enthalpy of one reaction can be achieved by algebraically adding the enthalpies of other reactions.
So, to calculate the ∆H (heat of reaction) of the combustion reaction, that is, the heat that accompanies the entire reaction, you must make the total sum of all the heats of the products and of the reagents affected by their stoichiometric coefficient ( number of molecules of each compound participating in the reaction) and finally subtract them.
Enthalpy of combustion = ΔH = ∑Hproducts - ∑Hreactants
2 ClF + O₂ → Cl₂O + F₂O ∆H=167.4kJ
Cl₂O + 3 F₂O → 2 ClF₃ + 2 O₂ ∆H= -341.4kJ
The previous equation must be inverted, and the enthalpy value is also inverted, that is, the sign is changed.
2 F₂ + O₂ →2 F₂O ∆H=-43.4kJ
Reactants and products are added or canceled, taking into account that certain substances sometimes appear as a reagent and others as a product, so they are totally eliminated (there is nothing left of them anywhere in the reaction, if the same amount in reagents and products) or partially (this substance remains, in less quantity, only on one side), obtaining:
2 ClF + 2 F₂ → 2 ClF₃
Then, as all the reactants and products have a stoichiometric coefficient of 2, dividend by that number is obtained:
ClF + F₂ → ClF₃
Adding the enthalpies algebraically, and dividing by 2, because to get the "data" reaction you had to multiply by two, you get:
ΔH= [167.4 kJ - 341.4 kJ - 43.3 kJ]÷2
ΔH= -108.7 kJ
The enthalpy change (∆H) for the reaction is -108.7 kJ
A one-ounce bag of Hot Cheetos has 90 calories from fat and 150 total calories. A party size bag of hot Cheetos is 18.5 ounces. How many calories of fat have you consumed if you eat half a bag of party-size chips?
Answer:
832.5 calories
Explanation:
One ounce bag of Hot Cheetos contains 90 calories from fat and 150 total calories. Also a party size bag of hot Cheetos weigh 18.5 ounces.
Therefore the weight of half of a bag of party-size chips = Size of a party size bag of hot Cheetos / 2 = 18.5 ounces / 2 = 9.25 ounces.
Since one ounce bag of Hot Cheetos contains 90 calories from fat, the amount of fat contained in half a bag of party-size chips (9.25 ounces) is given as:
Calories of fat in half a bag of party-size = 90 calories per ounce × 9.25 ounces = 832.5 calories
Answer:
832.5 calories
Explanation:
6.0 L of oxygen gas is at a temperature of 5K. If the temperature of the gas is lowered to 1K at constant pressure, what is the new volume of the gas?
Answer:
THE NEW VOLUME AT 1 K IS 1.2 L
Explanation:
Using Charles' law which states that the volume of a given gas is directly proportional to its temperature provided the pressure remains constant.
Mathematically written as;
V1/T1 = V2/T2 at constant pressure
V1 = Initial volume = 6L
T1 = initial temperature = 5K
T2 = Final temperature = 1K
V2 = final volume = unknown
Re-arranging the equation by making V2 the subject of the equation, we obtain;
V2 = V1 T2 / T1
V2 = 6 * 1 / 5
V2 = 1.2 L
The new volume of the gas sample at 1 K is 1,2 L
Answer:1.2 L
Explanation: according to Charles law, the volume of a fixed mass of gas is directly proportional to it's temperature.
Volume is the size of the space that a gas occupies and it can be measured in liters, cubic meters, cubic decimeters etc.
The solution to this question is in the attached photo
Please help! Don't forget to add your answer in kJ
Answer:
The answer to your question is given below.
Explanation:
The equation for the reaction is given below:
2H2O —> 2H2 + O2... ΔH = –572KJ
A. The reaction is exothermic since the enthalphy change, ΔH has a negative sign.
B. Since the enthalphy change, ΔH has a negative sign for the reaction, It means heat has be released to the surroundings. Therfore, 86.4g will also release heat.
C. We'll begin by calculating the mass of H2O that reacted from the balanced equation.
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g.
From the balanced equation above:
When 36g of H2O reacted, –572KJ of heat were released.
Therefore, 86.4g of H2O will react to release = (86.4 × –572)/36 = –1372.8KJ of heat.
Therefore, –1372.8KJ of heat is released.
What is the upward force on objects in a fluid
Answer:It is upthrust...
Explanation:I don't say u must have to mark my ans as brainliest but if it has really helped u plz don't forget to thank me my friend....
The reaction below demonstrates which characteristic of a base? Upper C U upper S upper O subscript 4 (a q) plus 2 upper N a upper O upper H (a q) right arrow upper C u (upper O upper H) subscript 2 (s) plus upper N a subscript 2 upper S upper O subscript 4 (a q).
Answer:
The ability of a base to react with a soluble metal salt
Explanation:
The equation is given as;
CuSO4(aq) + NaOH → Cu(OH)2(s) + Na2SO4(aq)
A strong base (NaOH) can easily react with a soluble metal salt (CuSO4) and displace it.
The reaction between CuSO4 and NaOH is a double displacement reaction.
Answer:
The ability of a base to react with a soluble metal salt
Explanation:
Name the elements present in a) zinc sulphide b) sodium oxide
Answer:
a) zinc, sulphur, oxygen
b) sodium, oxygen
How many grams of iron can be produced from 3.65g of Iron (III) Sulfate? 3Mg + Fe2(SO4)3 --> 3MgSO4 + 2Fe
A. 1.02g Fe B. 5.41g Fe C. 0.548g Fe D. 7.56g Fe
Answer:
Option A. 1.02g of Fe.
Explanation:
Step 1:
The balanced equation for the reaction.
3Mg + Fe2(SO4)3 —> 3MgSO4 + 2Fe
Step 2:
Determination of the mass Fe2(SO4)3 that reacted and the mass of Fe produced from the balanced equation. This is illustrated below:
Molar Mass of of Fe2(SO4)3 = (2x56) + 3[32 + (16x4)] = 112 + 3[32 + 64] = 112 + 3[96] = 400g/mol
Mass of Fe2(SO4)3 from the balanced equation = 1 x 400 = 400g
Molar Mass of Fe = 56g/mol
Mass of Fe from the balanced equation = 2 x 56 = 112g
From the balanced equation above,
400g of Fe2(SO4)3 reacted to produce 112g Fe.
Step 3:
Determination of the mass of Fe produced by reacting 3.65g of Fe2(SO4)3.
This is illustrated below:
From the balanced equation above,
400g of Fe2(SO4)3 reacted to produce 112g Fe.
Therefore, 3.65g of Fe2(SO4)3 will react to produce = (3.65 x 112)/400 = 1.02g of Fe.
Therefore, 1.02g of Fe is produced from 3.65g of Fe2(SO4)3.
A compound is formed by the reaction between magnesium and bromine. What is the chemical formula for this compound?
Answer:
Magnesium Bromide
Explanation:
MgBr₂
A) Cuantas fases tiene una ensalada de tomate y lechuga, un cafe con leche y un vaso de agua y aceite
B) Que tipo de sustancias son(Simple o compuesta).
Answer:
A)
A salad made of tomatoes and lettuce has two phases.Coffee with milk has one phase.A glass of water and oil has two phases.B) They are all compound substances
Explanation:
The salad and the glass of water with oil have two phases because their elements do not mix, we can see them separately. In the case of coffee with milk, there is only one phase because we can not see all the components separately, they are mixed in the solution.
They are all compound substances due to the fact that they are made of more than one element.
how many carbons atoms are in propane?
A 360. g iron rod is placed into 750.0 g of water at 22.5°C. The water temperature rises to 46.7°C. What was the initial temperature of the iron rod?
Answer: The initial temperature of the iron was [tex]515^0C[/tex]
Explanation:
[tex]heat_{absorbed}=heat_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
[tex]m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)][/tex] .................(1)
where,
q = heat absorbed or released
[tex]m_1[/tex] = mass of iron = 360 g
[tex]m_2[/tex] = mass of water = 750 g
[tex]T_{final}[/tex] = final temperature = [tex]46.7^0C[/tex]
[tex]T_1[/tex] = temperature of iron = ?
[tex]T_2[/tex] = temperature of water = [tex]22.5^oC[/tex]
[tex]c_1[/tex] = specific heat of iron = [tex]0.450J/g^0C[/tex]
[tex]c_2[/tex] = specific heat of water= [tex]4.184J/g^0C[/tex]
Now put all the given values in equation (1), we get
[tex]-360\times 0.450\times (46.7-x)=[750\times 4.184\times (46.7-22.5)][/tex]
[tex]T_i=515^0C[/tex]
Therefore, the initial temperature of the iron was [tex]515^0C[/tex]
Question 3 of 6
Which set of coefficients correctly balances the following chemical equation?
C4H603 + H20 = C2H4O2
(1 point)
A. 1, 1, 1 (already balanced)
B. 1, 1, 2
C. 1, 2,1
D. 2, 2, 1
E. 2, 1, 2
Answer:
B. 1, 1, 2
General Formulas and Concepts:
Chemistry - Reactions
Balancing ReactionsReaction PredictionExplanation:
Step 1: Define
RxN: C₄H₆O₃ + H₂O → C₂H₄O₂
Step 2: Balance
We need the same amount of Carbons on both sides (4)C₄H₆O₃ + H₂O → 2C₂H₄O₂
We see that we have balanced everything at this point.
Propane burns in oxygen to produce carbon
dioxide and water. What are the chemical
formulas of the reactants and products?
The formulas of the reactants are C3H8, O,
and CO2. The formula of the product is H20.
The formulas of the reactants are C3Hg and
O2. The formulas of the products are CO and
H20.
The formulas of the reactants are C3Hg and
02. The formulas of the products are CO2
and H20.
Answer:
Reactants are C3H8 and O2
Products is CO2 and H20
why did mendeleyev leave spaces in the periodic table
Answer:
Mendeleev left spaces in his periodic table because he predicted there were elements that weren't discovered yet that would fit in these spaces.
Explanation:
Answer:
He left gaps in his periodic table to place elements not known at the time.
which one of the ff is correct about Acids?
a,acids have bitter taste
b,acids have HP value of less than 7
c,acids have POH value of less than 7
d,all are correct
Answer:
b acid have ph less than 7
When is a scientific theory formed?
Answer:
when enough information is given to support a hypothesis (more info below)
Explanation:
If enough evidence accumulates to support a hypothesis, it moves to the next step known as a theory in the scientific method and is accepted as a valid explanation of a phenomenon. Tanner also explained that scientific theory is the framework for observations and facts.
hope I helped!
What is the value of x in the equation below?
Answer: 7
Explanation: i don't know how the HECK. -3-(-8)-(-2)=7 but I searched it up soooooo also I got it right
Which of the following are always the same for atoms of the same element?
Mass of an atom
Atomic number
Neutron number
Mass number
The atomic number remains the same for all atoms of the same element.
The atom is composed of;
ElectronsProtonsNeutronsThe electrons are found in the orbit while protons and neutrons are found in the nucleus of the atom.
The number of protons in an atom is its atomic number. It is the identity of an element. All atoms of the same element must have the same atomic number even though they may differ in mass number.
Learn more: https://brainly.com/question/803445
The reaction nC2H4 + (-C2H4-)n is
an
example of
1.
saponification
2.
esterification
3.
polymerization
4.
fermentation
Answer:
Polymerization
Explanation:
Polymerization is the process by which molecules of small organic compounds combine repeatedly, in a regular manner, to form a complex organic compound. These small organic repeated units are called monomers, while the complex product formed are referred to as polymer.
In this reaction,
nC₂H₄ + -(C₂H₄-)n is the combination of smaller units of C₂H₄(ethene) to form larger units of (C₂H₄)n (polyethene).
Polyethene is formed due to addition polymerization which is the process where ethene break their double bonds to form links, so that the empirical formula of both are the same. This occurs in a chain reaction and the process is known as polymerization.
How many grams of water can be formed when 80 grams of sodium hydroxide (NaOH) reacts with an excess of sulfuric acid, H2SO4, in solution?
2NaOH + H2SO4 --> Na2SO4 + 2H2O
_____ grams water
Answer:
36g of H2O.
Explanation:
We'll begin by writing the balanced equation for the reaction:
2NaOH + H2SO4 —> Na2SO4 + 2H2O
Next, we shall determine the mass of NaOH that reacted and the mass of H2O produced from the balanced equation. This is illustrated below:
Molar mass of NaOH = 23 + 16 + 1 = 40g/mol
Mass of NaOH from the balanced equation = 2 x 40 = 80g
Molar mass of H2O = (2x1) + 16 = 18g/mol
Mass of H2O from the balanced equation = 2 x 18 = 36g.
From the balanced equation above, we can see evidently that:
80g of NaOH reacted to produce 36g of H2O.
Why do chemical reactions happen?
Answer:
They happen because each element reacting is trying to attain stability
Explanation:
E.g Mg +Cl>MgCl2
acid rain water breaks down Rocks by_____ weathering
｡☆✼★ ━━━━━━━━━━━━━━ ☾
This would be 'chemical' weathering.
Acid rain would react with the minerals in the rocks, causing them to break down.
Have A Nice Day ❤
Stay Brainly! ヅ
- Ally ✧
｡☆✼★ ━━━━━━━━━━━━━━ ☾
Answer:
Chemical
Explanation:
Chemical weathering. The weathering of rocks by chemicals is called chemical weathering . Rainwater is naturally slightly acidic because carbon dioxide from the air dissolves in it. Minerals in rocks may react with the rainwater, causing the rock to be weathered.
HOPE IT HELPS :)
PLEASE MARK IT THE BRAINLIEST!
HELP URGENT HELP!!!!!!!!!!!!!! PLEASEEEEE
Answer: 200
Explanation:
The answer is 200 kPa
What is the name of CH3CH2OCH2CH3?
Answer:
It is an ether so the nomenclature rule for naming the above compound will be:Alkoxy alkane , generally Alkoxy represent the smaller alkyl group and as in the above question both the alkyl group are same so it's IUPAC Name will be: Ethoxy ethane or Diethylether both are correct
Explanation:
happy to help ya!
Help me with these questions google won’t tell them for me!!
If 0.092J of heat causes a 0.267 degree C temperature change, what mass of water is present?
Answer:
0.082g
Explanation:
The following data were obtained from the question:
Heat (Q) = 0.092J
Change in temperature (ΔT) = 0.267°C
Specific heat capacity (C) of water = 4.184J/g°C
Mass (M) =..?
Thus, the mass of present can be obtained as follow:
Q = MCΔT
0.092 = M x 4.184 x 0.267
Divide both side by 4.184 x 0.267
M = 0.092 / (4.184 x 0.267)
M = 0.082g
Therefore, mass of water was present is 0.082.
name two gases which are supplied in compressed form in homes and hospitals ?
Answer:
lpg and oxygen are two gases which are supplied in compressed form in homes and hospitals
Explanation:
pls say the 5 methods of preventing rusting of iron
Explanation:
Corrosion of iron is called as rusting. Rusting is oxidation of iron in the presence of oxygen and water and leads to formation of hydrated ferric oxide.
Methods to prevent rusting are :
1. Application of paint: It prevents the direct exposure of metal to atmosphere.
2. Application of oils or grease: It creates a barrier between the metal and atmosphere.
3. Galvanization : It is coating of iron with more active metal zinc so that zinc gets oxidized and protects iron.
4. Cathodic protection : It involves connecting iron to a more active metal which loses electrons on behalf of iron and thus protects iron by rendering it as cathode.
5. Coating with wax tapes: It prevents the direct exposure of metal to atmosphere.
Describe air pollution from the burning of forests.
Answer:
Explanation: Wildfires emit carbon dioxide and other greenhouse gases that will continue to warm the planet well into the future. They damage forests that would otherwise remove CO2 from the air.
Student Name:.....
Q1.
The drawing below shows Rebekah pulling a turnip out of the ground.
B
(a)
Which arrow, A, B, C or D, shows the direction of force of Rebekah's hand on the
turnip?
1
1 mark
Answer:
ummm I really want to help with this problem but I think that you forgot the photo of Rebekah Pullin the turnip
