In the gaseous state, chlorine exists as a diatomic molecule Cl2 (Molar mass = 70.9 g/mol). Calculate the number of moles of chlorine present in 140 g of chlorine gas. Express the quantity in moles to three significant figures.
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Considering the definition of molar mass, the number of moles of chlorine present in 140 grams of chlorine gas is 1.975 moles.
Definition of molar mass
The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.
Number of moles present in 140 g of Cl₂
Next, you can apply the following rule of three: If by definition of molar mass 70.9 grams are contained in 1 mole of Cl₂, 140 grams of the gas are contained in how many moles?
amount of moles= 1.975 moles
Finally, the number of moles of chlorine present in 140 grams of chlorine gas is 1.975 moles.
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The three-dimensional structure of macromolecules is formed and maintained primarily through noncovalent interactions. Which one of the following is not considered a noncovalent interaction?A) carbon-carbon bondsB) hydrogen bondsC) hydrophobic interactionsD) ionic interactions
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Final answer:
The breaking of the chemical bond between the second and third phosphates of ATP (Adenosine triphosphate) releases significant energy, transforming ATP into adenosine diphosphate (ADP) and an inorganic phosphate group. The energy released powers various biological processes and reactions within cells. This cycle of breaking and reforming ATP, often referred to as hydrolysis, is crucial to cellular function.
Explanation:
Adenosine triphosphate (ATP) is a high-energy molecule that powers cellular processes. When the chemical bond between the second and third (or beta and gamma) phosphates of ATP is broken, it releases significant energy. This reaction, known as hydrolysis, transforms ATP into adenosine diphosphate (ADP) and an inorganic phosphate group (P;), both of which have lower free energy than the reactants. Here is the specific reaction: ATP + H₂O → ADP + P¡ + free energy.
The breaking of phosphates' strong bonds (phosphoanhydride bonds) releases enough energy to power various cellular reactions and processes. These bonds are considered 'high-energy' due to the amount of energy they release upon breaking.
This continuous cycle of ATP breaking down into ADP and phosphate, followed by their recombination, effectively powers the life processes within cells.
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Which type of reaction is represented by this equation?
(1) synthesis
(2) decomposition
(3) single replacement
(4) double replacement
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Answer: Option (2) is the correct answer.
Explanation:
An equation in which the the number of reactants equal the number of products is known as a balanced equation.
Whereas a reaction in which a compound dissociates into two or more compounds is known as a decomposition reaction.
Therefore, the given reaction represents that
decomposes into KCl and
.
Hence, it is a decomposition reaction.
Decomposition reaction is the type of reaction that is represented by the given equation. Therefore, the correct option is option 2.
A chemical reaction called a decomposition reaction, often referred to as an analysis or dissociation, occurs when a compound disintegrates into more basic elements. A single compound is transformed into two or more products in this reaction, which may be elements or other compounds.
Decomposition reactions are typically induced by heat, light, electricity, or the presence of a catalyst. These reactions occur because the reactant compound is unstable under certain conditions, leading to its breakdown into more stable products. Therefore, is a decomposition reaction.
Therefore, the correct option is option 2.
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B. An ionized atom has a number of protons that is unequal to the number of electrons.
C. A cation will hold a positive charge if it gains one or more electrons.
D. Losing one or more electrons will turn an atom into an anion.
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Answer:
B. An ionized atom has a number of protons that is unequal to the number of electrons.
Explanation:
Bc its is got 100% on pf
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PV = nRT
where P - pressure 1.46 atm x 101 325 Pa/atm = 147 934.5 Pa
V - volume
n - number of moles - 1 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 270 K
substituting these values in the equation
147 934.5 Pa x V = 1 mol x 8.314 Jmol⁻¹K⁻¹ x 270 K
V = 15.17 L
the volume is 15.17 L