What is the Hf for this reaction? 16CO2(g) + 18H2O(g) 2C8H18(l) + 25O2(g)

Answers

Answer 1

Answer:

To solve this we must be knowing each and every concept related to Enthalpy. Therefore, 10,148KJ/mol is the ΔH for formation for the reaction 16CO $_2$ (g) + 18H $_2$ O(g) $\rightarrow$ 2C $_8$ H $_(18)$ (l) + 25O $_2$ (g)

What is Enthalpy?

Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance.

The balanced equation for the given chemical reaction can be given as

16CO $_2$ (g) + 18H $_2$ O(g) $\rightarrow$ 2C $_8$ H $_(18)$ (l) + 25O $_2$ (g)

ΔH for formation= 10,148KJ/mol

Therefore, 10,148KJ/mol is the ΔH for formation for the reaction 16CO $_2$ (g) + 18H $_2$ O(g) $\rightarrow$ 2C $_8$ H $_(18)$ (l) + 25O $_2$ (g)

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Answer 2

Answer:

Answer:

10,148

Explanation:

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A strong acid with a concentration of 0.01 Mol/L would have a pH of __________.2134
Given the reaction below, which is the oxidized substance? Mg + Cl2 Mg2+ + 2Clmc005-2
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GIVING BRAINLIEST!!! A student observes a beaker of room temperature water resting on a table. She states that the beaker of water does not have any energy. Which statement below is accurate regarding her observation?a. She is correct because the beaker of water is not moving.

b. She is incorrect because the beaker of water has thermal energy.

c. She is incorrect because all water contains hydrogen and oxygen.

d. She is correct because the beaker of water is at room temperature.

Answers

Answer:

Explanation:

im thinking because the water is a room temperature there shouldnt be anm immence amount og heat energy for it to have a good amount of energy tho i could be wrong because its not moving it could have no energy.

Answer: please tell me i have this exact thing on a test rn i need the answer

Explanation:

Find the grams of iron in 79.2 g of Fe2O3.

Answers

First you find the RFM (Relative Formula Mass) of Fe2O3
Fe2 = 56 x 2
= 112
O3 = 16 x 3
= 48

112 + 48 = 160

Moles = mass/RFM
   = 79.2/160
   =0.495

Then you rearrange the formula
Mass= moles x RFM
      = 0.495 x 112
      = 55.44 g
(To find mass of Iron have to use RFM of total iron in the substance example Fe2 ^^)

Make the following conversion. 0.075 m = _____ cm 7.5 75 0.0075 0.00075

Answers

7.5 is the answer. You have to move the decimal 2 places to the right.

Answer:

7.5 is the answer. You have to move the decimal 2 places to the right

Explanation:

Regarding the formula Al2O3 which of the following is accurate?A. The coefficient 3 indicates that there are a total of three atoms of oxygen present in the substance.
B. The subscript 2 indicates that two atoms of oxygen are present in the substance.
C. The chemical symbol Al indicates that oxygen is present in the substance.
D. The subscript 2 indicates that two atoms of aluminum are present in the substance

Answers

The question says,'regarding the formular Al2O3, which of the following is accurate. The correct option is D. The subscript indicate that there are two atoms of aluminium in the compound. The subscript 3 indicates that, there are three atoms of oxygen in the molecule. The figure 3 attach to oxygen is a subscript not a coefficient, that is why option A is not correct.

Final answer:

In the formula Al2O3, the subscript 2 indicates the presence of two atoms of Aluminium, and the subscript 3 indicates the presence of three atoms of Oxygen.

Explanation:

The formula Al2O3 is for aluminium oxide. The coefficient and subscript in this formula tell us about the number of atoms of each element present in the compound. In this case:

The chemical symbol Al indicates the presence of Aluminium.
The subscript 2 (in Al2) indicates that there are two atoms of aluminum present in the substance.
The chemical symbol O indicates the presence of Oxygen.
The subscript 3 (in O3) indicates there are three atoms of oxygen present in the substance.

So, the correct answer to the question is, the subscript 2 indicates that two atoms of aluminum are present in the substance (option D).

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During Mr. Nye's science class, students were expected to identify various substances using physical properties they could easily measure. Mr. Nye gave each of the five groups a green, metal cube. The students had to identify what metal the cube was made of. The length of each side was 3.0 cm and the mass was 270 grams.

Answers

Given the length of each side of a cube and its mass, the density can be obtained which can then help identify the type of material it's made of. This is because density is a unique and intrinsic property of materials. For this problem, the density is determined to be 10g/cm^3. Looking at a table of densities, the metal is most likely actinium, which has an exact density of 10 g/cm^3.

Answer:Density

Explanation: The students should compute the density of the cube. Density is a physical property that can be used to identify most pure substances. The students know the length of a side so they can compute the volume. They also know the mass. Using the density formula, density =

mass

volume

, they can compute the density and identify the metal.

Which quantity identifies an element?1. Atomic number
2. Mass Number
3. total number of neutrons in an atom of the element
4. total number of valence electrons in an atom of the element

Answers

Answer is (1) - atomic number.

Atomic number is unique for an element. The elements in periodic table are organized according to the atomic number of elements. Another thing is atomic number is equal to number of protons of the element.

Mass number can be defined as the sum of proton number and neutron number. Although proton number is same for the atoms of same element, the neutron number can be varied.The atoms which has same atomic number but have different number of neutrons are called isotopes. Hence, mass number not enough for the identification of elements.

Only the neutron number is also not enough for the identification of elements. But if you have both mass number and the neutron number, then you can find atomic number by using mass number = proton number + neutron number equation. Then you can identify the element.

If you have total number of electrons of the element when it is in its neutral state you can identify the element because at neutral state number of electrons = number of protons (atomic number). But if only the valence electrons are given then you cannot find the element exactly because usually all elements in certain group have same number of valence electrons.

Atomic number identifies an element. Atomic number is the number of protons in the atom of an element, which is different for every element.

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It has been proposed that North America is moving west at about 2 cm per year. How many kilometers would it move in 5,000 years? (Note: 2 cm is a measurement so your final answer should have significant figure rules applied.)