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stealth61 [152]
3 years ago
14

Look at the questions below and decide which is declarative.

Chemistry
1 answer:
Yuliya22 [10]3 years ago
3 0
Im not sure but here is some information to help A declarative question is a yes-no question that has the form of a declarative sentence but is spoken with rising intonation at the end. Declarative sentences are commonly used in informal speech to express surprise or ask for verification.
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Use the amount (mol) of solute and amount (mol) of solvent to calculate the mole fraction. An aqueous solution of ethanol, CH3CH
Blizzard [7]

Answer:

%m/m = 0.9975%

Xₐ = 0.0039

Explanation:

In order to do this, we need various data. First to all, we need tje molecular mass of the ethanol. this can be obtained in handbooks, or simply taking the atomic weights of carbon (12 g/mol), Hydrogen (1 g/mol) and oxygen (16 g/mol) and summing those values:

MM C₂H₆O = (2*12) + (6*1) + (16*1) = 46 g/mol

Now, there is an expression that is commonly used to determine the molarity of a solution given the mass percent and density, and assuming of course, 1 liter of solution:

M = d * %m/m * 1000 / MM * 100     (1)

From here, we can solve for %m/m:

%m/m = M * MM * 100 / d * 1000

As the problem is not saying the volume of solution, we can easily assume we have 1 liter of solution. Therefore, the %m/m replacing the given data is:

%m/m = 0.216 *46 * 100 / 0.996 * 1000

<h2>%m/m = 0.9975%</h2>

To get the mole fraction, we first need to get the volume of solvent. From the density, we can get the mass of solution:

m = V * d

m = 1000 * 0.996 = 996 g of solution.

The mass of solute is:

m = 0.216 mol/L * 46 g/mol

m = 9.936 g/L, or simply we have 9.936 g of ethanol in 1 L of solution.

The mass of solvent:

solvent = 996 - 9.936 = 986.064 g

The molecular mass of water, so we can get the moles is 18 g/mol so:

moles water = 986.064 / 18 = 54.78

Finally the mole fraction:

Xₐ = 0.216 / (0.216 + 54.78)

<h2>Xₐ = 0.0039</h2>

Hope this helps

4 0
3 years ago
Coal is a natural resource.
Afina-wow [57]

Answer:

May be the answer is C. Coal is being used faster than it is being produced

6 0
2 years ago
What is the atomic number of this atom?a,b,c,8,13,9,5,4
Ulleksa [173]

Answer:

We cannot see the atom so we are unable to answer this question for you.

Create another one.

8 0
2 years ago
Which of the following is NOT an organic compound?
Sladkaya [172]

Answer:

the first one

Explanation:

8 0
3 years ago
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Check the box of any item below that can be categorized as matter.
Westkost [7]

Answer:

Sun air

Explanation:

3 0
3 years ago
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