1. Molarity : 0.25 M
2. mol CH₄ = 7.4 moles
mol O₂ = 14.8 moles
<h3>Further explanation</h3>
1.
Given
83.2 g CuCl2 in 2.5 liters of water
Required
the molarity
Solution
Molarity : mol solute per liter of solution(not per liter of solvent)
mol solute = mol CuCl₂
mol CuCl₂ = mass : MW CuCl₂
mol CuCl₂ = 83.2 : 134.45
mol CuCl₂ = 0.619
Molarity(M) = mol : V
Assume density CuCl₂ = 3.39 g/cm³
volume CuCl₂ = 8.32 g : 3.39 g/cm³ = 2.45 cm³=2.45 x 10⁻³ L
With this small volume value of CuCl₂, the volume of the solute is sometimes neglected in calculating molarity
volume of solution = 2.5 L + 2.45 x 10⁻³ L = 2.50245 L
Molarity(M) = mol : V
M = 0.619 : 2.50245 L = 0.247≈0.25
2.
Given
Reaction
The correct balanced reaction:
CH4 + 2O2 → CO2 + 2H2O
7.4 moles CO2
Required
moles of methane (CH4) and oxygen gas (O2)
Solution
From the equation, mol ratio of CO₂ : CH₄ : O₂ = 1 : 1 : 2
mol CH₄ = mol CO₂ = 7.4 moles
mol O₂ = 2 x mol CO₂ = 2 x 7.4 moles = 14.8 moles
Answer:
The programs take two-dimensional images and allow the user to manipulate cubes and prisms to create their design sketches.
Explanation:
Instead of working with squares and triangles, the programs allow the users to manipulate cubes and prisms to create their design sketches. Additionally, the programs can take two-dimensional pictures and convert them to possible three-dimensional images.
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- massmaster34
Answer:
The answer is letter b, mixture.
Explanation:
Let's define what a mixture is at first.
Mixture- In Chemistry, mixture is a material made up of two or more different substances that are physically combined. The identities of the substances are retained. There are two types of mixture: <em>homogenous and heterogenous.</em>
<u>Homogenous mixture</u> examples: saline solution and air.
<u>Heterogenous mixture</u> examples: sand and oil and water.
The student's record shows the color of the substance as yellow, shiny powder. It could mean that the substance is a mixture of different kinds of powders. This is already a hint, since powder is a form of mixture. The record also shows that the substance is attracted to magnet. Part of the powder mixture contains something that is attracted to magnet. It could be an iron powder, which is the shiny one. The substance can then be classified as letter b, mixture.
Answer:
B. Some of the absorbed energy is converted into potential energy, and some is converted into kinetic energy
Explanation:
Answer: A chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.
Explanation:
When the concentration of both the reactants and products do not change with time then it means the chemical reaction has reached to a state of chemical equilibrium.
For example, 
Therefore, we can conclude that a chemical equilibrium exists when the rate at which reactants form products is the same as the rate at which products form reactants.
