After data are collected, they are often arranged in a(n) ___________???

Answer:

P = 0.979 atm

Explanation:

Given data:

Number of moles of methane = 40.8 mol

Volume of container = 1020 L

Temperature = 298 K

Pressure of gas =?

Solution:

According to ideal gas equation,

PV = nRT

P = pressure

V = volume

n = number of moles

R = general gas constant

T = temperature

Now we will put the values,

P = nRT/V

P = 40.8 mol × 0.0821 atm.L/mol.K × 298 K / 1020 L

P = 998.2 atm /1020

P = 0.979 atm

Answer:

The heat of reaction when hydrogen and oxygen combine to form water is :

C. 571.6 kJ

Explanation:

Enthalpy Change = The enthalpy change for the formation of 1 mole of the substance from their standard state is called the enthalpy of formation.

This is intensive quantity as it is fixed for 1 mole .

Intensive properties = Those properties which are independent on the amount of the substance are intensive properties.

The value of these quantities does not get halve if you divide the substance into two equal parts. example , density, refractive index.

However , the enthalpy of reaction is extensive. Because on increasing the amount the value of the enthalpy also get doubles

Hence for this reaction :

Its value is -285.8 kJ for 1 mole

And here two moles are present . so the value of molar enthalpy is:

-285.8 x 2 = -571.6 kJ

Answer: C. That you can see the different component parts of the mixture.

Explanation: Heterogeneous mixtures does not have a uniform apperance so the individual components of the mixture seen visually and can be separated by physical means.

The elements of a heterogeneous mixture can be distinguished visually. It means that you can see the different component parts of the mixture.

So, the correct answer is c. That you can see the different component parts of the mixture.

When a mixture is described as "heterogeneous," it means that its components are not evenly distributed, and they can be visually distinguished from each other. This is because the components exist in separate phases or regions within the mixture, and they may have different physical properties, such as color, density, size, or state of matter (solid, liquid, gas).

In a heterogeneous mixture, you can physically see or identify the different component parts without the need for specialized equipment or chemical analysis. Common examples include a salad with various ingredients, a bowl of cereal with milk, or a jar of mixed nuts.

The other options are not accurate descriptions of a heterogeneous mixture:

a. Heterogeneous mixtures can consist of more than two components, and they don't necessarily involve separate elements mixed together.

b. Heterogeneous mixtures can often be separated by physical means (e.g., filtration or hand-picking), which distinguishes them from homogeneous mixtures.

d. Heterogeneous mixtures can involve a combination of solids, liquids, or gases, but they are not limited to this combination.

Thus, the correct answer is c. That you can see the different component parts of the mixture.

For more such questions on heterogeneous mixture:

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