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4 years ago

A compound is 12.7% Al, 19.7% N, and 67.6% O. Determine its emperical formula.

Chemistry

1 answer:

gizmo_the_mogwai [7]4 years ago

3 0

Answer:

AlN₃O₉

Explanation:

Assume that you have 100 g of the compound.

Then you have 12.7 g Al, 19.7 g N, and 67.6 g O.

1. Calculate the moles of each atom

Moles of Al = 12.7 × 1/26.98 = 0.4707 mol Al

Moles of N = 19.7 × 1/14.01 = 1.406 mol N

Moles of O = 67.6 × 1/16.00 = 4.225 mol O

2. Calculate the molar ratios.

Al: 0.4707/0.4707 = 1

N: 1.406/0.4707 = 2.987

O: 4.225/0.4707 = 8.976

3. Determine the empirical formula

Round off all numbers to the closest integer.

Al: 1

N: 3

O: 9

The empirical formula is AlN₃O₉.

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Non-electrolyte = A, 10.6 grams, dissolved in solvent B, 740 grams, the boiling point of the solution is higher than the boiling

Thepotemich [5.8K]

Answer:

2.1 °C/m

Explanation:

Hello, for this exercise, consider the formula:

$T_{solution}-T{solvent}=K_bm_solute$

Considering that the difference in the temperature is 0.284°C, and the given molality by:

$m_{solute}=\frac{10.6g\frac{1mol}{106g}}{740g*\frac{1kg}{1000g} } \\m_{solute}=0.135m$

Now, solving for $K_b$ , we get:

$K_b=\frac{0.284C}{0.135m}\\K_b=2.1 C/m$

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8 0

3 years ago

Identify solute and solvent in 80 solution of ethyl alcohol with water

diamong [38]

The solute is the part of the solution that dissolves in the second component (usually a fluid). Therefore, for the mentioned solution, the solute is ehyl alcohol since it is the one dissolving in water.

As for the solvent, it is the component in which the solute dissolves. In this case, it is water.

5 0

4 years ago

Which of the following is TRUE? A) The equivalence point is where the amount of acid equals the amount of base during any acid-b

liberstina [14]

Answer:

the correct option is B

Explanation:

The correct option is b, since if we reach pH 7, it means that the acid-base reaction is neutralized, therefore the base has been neutralized by an acid or vice versa, without taking into account the proteins or the amounts of both components .

5 0

4 years ago

Read 2 more answers

What is the mass of 6.5x10^15 atoms of Ni

just olya [345]

6.337 X 10^-7. To get this, divide the atoms by Avogadro's number, them multiply my the molar mass of Ni.

7 0

3 years ago

Vinegar is a commercial form of acetic acid, HC2H3O2 (aq). One sample vinegar has a pH value of 2.4. State the pH value of a sam

Yuri [45]

3.41 is the pH value of a sample that has ten times fewer hydronium ions than an equal volume of a vinegar sample with a pH value of 2.4.

Explanation:

pH of the first sample of acetic acid = 2.4

to know the [H+] concentration in the acetic acid solution, the equation used is:

pH = -log [H+]

[H+] = $10^{-pH}$

[H+] = $10^{-2.4}$

[H+] = 3.98 X $10^{-3}$ M

The concentration of H+ ion in first case is 3.98 X $10^{-3}$ M, the second sample has ten times less hydronium ion so concentration of first case is divided by 10.

3.98 x $10^{-4}$ M

Now pH of the sample having 10 times fewer ions of acetic acid:

pH = -log [H+]

putting the values in the above equation:

pH = -log [3.98 x $10^{-4}$ M]

pH = 3.41

If solution has ten times less hydronium ion the pH will change to 3.41.

8 0

3 years ago