Answer:
A. 70.0 kpa
Explanation:
Given
Pressure = 525.4 torr
Required
Convert to kPa
From standard unit of conversion;

Multiply both sides by 525.4


<em>(Approximated)</em>
<em>From the list of given options, option A is the closest answer after 525.4 torr is converted to its kpa equivalent</em>
The Lewis structures in which there are no formal charges is the most stable. Hence, structure (b) is the more stable form of FNO2.
<h3>Lewis structure</h3>
The question is incomplete but I will try to answer you as much as I can. Now the equation is missing hence we can't numerically caculate the enthalpy chnage of the reaction from bond energies. However, we can do this using the formula; Σbond energy of reactants - bond energy of products.
Concerning the Lewis structures of FNO2, the most stable structure is structure (b) as shown in the image attached where the atoms have no formal charges.
Learn more about Lewis structure:brainly.com/question/4144781
<u>Answer: </u>The correct answer is Option B.
<u>Explanation:</u>
First law of thermodynamics states that the energy can neither be destroyed not be formed but it can only be transformed from one form to another.
Here, the internal energy of the system is being transformed to the heat energy and the work done by the system. The equation used to represent first law of thermodynamic is:

where,
represents the internal energy of the system.
Q = heat released or absorbed by the system.
w = work done by or on the system.
Hence, the correct answer is Option B.
<span>A total mechanical energy of an object is calculated as the sum of kinetic energy and potential energy</span>
The mass of hematite that contains 8.0×10³ kg of iron is 2.29 × 10⁴ kg.
<h3>What are iron ores?</h3>
Iron ores refers to minerals in which iron occur in combined form found in the earth's crust.
Some ores of iron include:
- hematite,
- magnetite,
- limonite, and
- siderite.
Molar mass of hematite, Fe₂O₃ = 160 g/mol
Molar mass iron = 56 g/mol
Percent mass of iron in hematite = 56/160 = 35%
The mass of hematite that contains 8.0×10³ kg of iron = 8.0 × 10³kg/0.35 = 2.29 × 10⁴ kg.
Therefore, the mass of hematite that contains 8.0×10³ kg of iron is 2.29 × 10⁴ kg.
Learn more about iron ores at: brainly.com/question/4693242
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