When 2 mol of Fe(s) reacts with Cl2(g) to form FeCl3(s) according to this equation, 799 kJ of energy is evolved. Calculate ΔrHo. A) -399.5 kJ mol^-1 B) -199.75 kJ mol^-1 C) 399.5 kJ mol^-1 D) 199.75 kJ mol^-1
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Cobalt (Co) has an atomic mass of 59 and an atomic number of 27. Which statement correctly describes an atom of cobalt?A. An atom of cobalt contains more neutrons than protons. B. An atom of cobalt contains more electrons than protons. C. An atom of cobalt contains the same number of neutrons and protons. D. An atom of cobalt contains the same number of neutrons, electrons and protons.
Calculate the density of argon gas at a pressure of 753 mmHg and a temperature of 35 °C
Many chemical and toxic substances used in modern industry are flammable or combustible. true/false
Warm water is less dense than cold water.
The density is the same for warm and cold water.
The density will sometimes be higher for warm water and other times higher for cold water.
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It is due to the the effect of heat on water molecules that's why warm water tend to rise above cold ones. The molecules of the water are excited by the energy. They begin moving faster, so when they bump into one another, they bounce further away. The increase space between the fast-moving molecules decreases the density.
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In the case of sodium chloride (NaCl) and glucose, both substances are indeed soluble in water. However, the solubility of NaCl is generally greater than that of glucose due to differences in their chemical properties.
NaCl is an ionic compound, meaning it consists of positive sodium ions (Na+) and negative chloride ions (Cl-). When NaCl is added to water, the polar water molecules surround the ions and separate them from the crystal lattice. These water molecules form favorable interactions with the charged ions through ion-dipole attractions, resulting in the dissolution of NaCl in water. These strong ion-dipole forces contribute to the high solubility of NaCl in water.
On the other hand, glucose is a covalent compound composed of carbon, hydrogen, and oxygen atoms. It does not dissociate into ions when dissolved in water. Instead, glucose molecules interact with water through weaker intermolecular forces such as hydrogen bonding and dipole-dipole interactions. While these forces allow glucose to dissolve in water, they are relatively weaker than the ion-dipole interactions in NaCl-water solution. As a result, glucose has a lower solubility compared to NaCl in water.
Therefore, the differing chemical properties of sodium chloride and glucose contribute to the higher solubility of NaCl in water compared to glucose.
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b. Saturated and dilute
c. Saturated and unsaturated
d. Supersaturated and saturated
e. None of these
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Answer: The mass of ammonia is 5.236 g and that of sulfuric acid is 15.064 g
Explanation:
- Calculating the mass of ammonia:
To calculate the number of moles, we use the equation:
.....(1)
Given mass of ammonium sulfate = 20.3 g
Molar mass of ammonium sulfate = 132.14 g/mol
Putting values in equation 1, we get:
The chemical equation for the reaction of ammonia and sulfuric acid follows:
As, sulfuric acid remains unreacted, which means it is an excess reagent and its starting mass cannot be determined from ammonium sulfate.
By Stoichiometry of the reaction:
1 mole of ammonium sulfate is produced by 2 moles of ammonia.
So, 0.154 moles of ammonium sulfate is produced by = of ammonia.
Now, calculating the mass of ammonia from equation 1, we get:
Molar mass of ammonia = 17 g/mol
Moles of ammonia = 0.308 moles
Putting values in equation 1, we get:
- Calculating the mass of sulfuric acid
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
Let the mass of sulfuric acid be 'x' grams
We are given:
Mass of ammonium sulfate = 20.3 grams
Mass of ammonia = 5.236 grams
Total mass on reactant side = 5.236 + x
Total mass on product side = 20.3 g
So, by applying law of conservation of mass, we get:
Hence, the mass of ammonia is 5.236 g and that of sulfuric acid is 15.064 g
34.06g : 98.08g : 132.14g
x y 20.03g
x = [20.03g*34.06g]/132.14g = 5.16g
5.16g + y = 20.03g ⇔ from stoichiometric ratio
20.03g - 5.16g = y
y = 14,87g + 5.89g = 20.76g ⇔ 5.89g of sulfuric(VI) acid remains unreacted
Starting mass:
mNH₃ = 5.16g
mH₂SO₄ = 20.76g
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Answer:
The answer is D) All the above
Explanation:
Increased variation in animal size is favored when large plant species are present in a healthy ecosystem.
Overproduction of smaller animals is favored when algae swards are short and vice versa when algae swards are long.
Traits are exchanged between iguana and algae populations so that taller algae result in larger iguana populations
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The body size of this population of iguanas correlate with algae height because Traits are exchanged between iguana and algae populations so that taller algae result in larger iguana populations
Answer;
The correct answer would be Differential reproduction of larger animals is favored when adequate nutrition is supplied by larger algae.
The size of the food influences the size of the organism.
Due to availability of larger food or larger algae, longer iguanas tend to live and survive more.
Thus, the tend to survive and reproduce more as compared to the shorter iguanas.
Similarly, when algae or food is not available, then larger iguanas die due to malnutrition and shorter iguanas tend to survive.