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3 years ago

a solution is made by adding 27.5 g of calcium fluoride to enough water to make 1.00L. what is the concentration (molarity)?

Chemistry

1 answer:

Anarel [89]3 years ago

7 0

Answer:

The concentration will be 0.352 M

Data Given

mass of calcium fluoride = 27.5 g

molar mass of calcium fluoride = 78.07 g/mol

Volume = 1.0 L

Solution:

Molarity = given mass÷ molar mass) × (1 ÷ vol (L) )

Molarity = (27.5 ÷ 78.07)× (1 ÷ 1) = 0.352 M

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(1.) Using Beer's Law, How will the absorbance measured for the solutions change as the concentration of aspirin in solutions in

Vesnalui [34]

Answer:

(1) The absorbance of the aspirin in solutions will increase.

(2) [ASA]f = 3.79x10⁻⁴M

(3) [ASA]i = 3.79x10⁻³M

(4) m ASA = 0.171g

Explanation:

The Beer's Law is expressed by:

$A = \epsilon \cdot l \cdot C$ (1)

where A: is the absorbance of the species, ε: is the molar attenuation coefficient, l: is the pathlength and C: is the concentration of the species

(1) From equation (1), the relation between the absorbance of the species and its concentration is directly proportional, so if the aspirin concentration in solutions increases, the absorbance of the solutions will also increase.

(2) Starting in the given expression for the relationship between absorbance and concentration of ASA, we can calculate its concentration in the solution:

$A = 1061.5 \cdot [ASA]$

$[ASA] = \frac{A}{1061.5} = 3.79 \cdot 10^{-4}M$

Therefore, the aspirin concentration in the solution is 3.79x10⁻⁴ M

(3) To calculate the stock solution concentration, we can use the next equation:

$V_{i} [ASA]_{i} = V_{f} [ASA]_{f}$

where Vi: is the stock solution volume=10mL, Vf: is the solution diluted volume=100mL, [ASA]i: is the aspirin concentration of the stock solution and [ASA]f: is the aspirin concentration of the diluted solution

$[ASA]_{i} = \frac{V_{f} \cdot [ASA]_{f}}{V_{i}} = \frac {100mL \cdot 3.79\cdot 10^{-4} M}{10mL} = 3.79 \cdot 10^{-3} M$

Hence, the concentration of the stock solution is 3.79x10⁻³M

(4) To determine the aspirin mass in the tablet, we need to use the following equation:

$m_{ASA} = \eta_{ASA} \cdot M_{ASA} = [ASA]_{i} \cdot V_{0} \cdot M_{ASA}$

where η: is the aspirin moles = [ASA]i V₀, M: is the molar mass of aspirin=180.158g/mol, V₀: is the volume of the volumetric flask=250mL and [ASA]i: is the aspirin concentration in the volumetric flask which is equal to the stock solution=3.79x10⁻³M

$m_{ASA} = 3.79 \cdot 10^{-3} \frac{mol}{L} \cdot 0.250L \cdot 180.158 \frac{g}{mol} = 0.171 g$

Then, the aspirin mass in the tablet is 0.171 g.

I hope it helps you!

5 0

3 years ago

The ionization energies (kJ/mol) of hydrogen, nitrogen, sodium, chlorine, and fluorine are 1,312, 1,402, 496, 1,256, and 1,681,

Norma-Jean [14]

Answer: Sodium will most likely to become a monoatomic ion with fluorine when these atoms interact.

Explanation:

Ionization energy is defined as the energy required to remove the most loosely bound electron from a neutral gaseous atom.

With increase in atomic size of the atom, there will be less force of attraction between the nucleus and the valence electrons of the atom. Hence, with lesser amount of energy the valence electrons can be removed.

More is the value of ionization energy more it is difficult to remove an electron. Therefore, lesser is the reactivity of element.

Hence, we can conclude that sodium will most likely to become a monoatomic ion with fluorine when these atoms interact.

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3 years ago

The following questions refer to the graph below, where sulfur trioxide is put into a sealed bottle and allowed to stand over ti

OleMash [197]

The concentration of the sulfur trioxide decreases with time due to its decomposition into sulfur dioxide and oxygen.

<h3>What is the balanced equation for the decomposition of sulfur trioxide into sulfur dioxide and oxygen?</h3>

The balanced equation for the decomposition of sulfur trioxide into sulfur dioxide and oxygen is given below as:

2 SO₃ -----> 2 SO₂ + O₂

The addition of more sulfur trioxide to the bottle will result in increase in the volume of oxygen present as equilibrium will shift towards formation of products.

The addition of more sulfur dioxide to the bottle will result in decrease in the volume of oxygen present as equilibrium will shift towards formation of sulfur trioxide due to increase in product concentration.

Based on the graph, if the bottle is sealed, the concentration of sulfur trioxide will remain in dynamic equilibrium with the concentration of the products after the second day.

Based on the above information and reaction, the best way to reduce the amount of SO3 in the atmosphere, and thus reduce the amount of acid rain is to allow it to decompose before emission into the atmosphere,

Therefore, the concentration of the sulfur trioxide decreases with time due to its decomposition into sulfur dioxide and oxygen.

Learn more about sulfur trioxide decomposition at: brainly.com/question/10982712

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2 years ago

Identify Periodic Table

Anarel [89]

A)poor metals
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C)metalloids
D)transition metals
E)alkali metals

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