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3 years ago

The balanced chemical equation, C (s) + O2 (g) CO2 (g), can be expressed in words as...

2 answers:

4 0

You can eliminate three choices off the bat by seeing the last phrase of each equation is not correctly described as carbon dioxide. Therefore, the correct phrasing would be C. Solid carbon plus oxygen gas yields carbon dioxide gas.

Sati [7]3 years ago

4 0

Answer: The correct answer is Option 3.

Explanation:

When solid carbon burns in the presence of oxygen gas, it leads to the production of a gas known as carbon dioxide.

To write a chemical equation, we must follow some of the rules:

The reactants are always written on the left side of the direction arrow.
A '+' sign is added between the reactants, if more than one reactants are present.
An arrow is added after all the reactants are written. The arrow indicates the direction of reaction.
The products are always written on the right side of the direction arrow.
A '+' sign is added between the products, if more than one products are present.

Here, carbon and oxygen are the reactants and carbon dioxide is the product.

The chemical equation representing this reaction follows:

$C(s)+O_2(g)\rightarrow CO_2(g)$

Here, (s) represents that the carbon is in solid state and (g) represents that the oxygen and carbon dioxide are in gaseous state.

Hence, the correct answer is Option 3.

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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

12 is produced by the reaction of 0.5235 mol of CuCl2 according to the following equation: 2CuCl2 +4K1—2Cul + 4KCI + 12. What is

Keith_Richards [23]

Answer:

The mass of I₂ produced is 66.43 g.

Explanation:

In a stoichiometry exercise we follow a series of steps.

Step 1: Write the balanced equation

2 CuCl₂ + 4 KI ⇄ 2 CuI + 4 KCl + I₂

Step 2: Look for the relationship between the data we have and the one we are looking for

According to the balanced equation, when 2 moles of CuCl₂ react 1 mole of I₂ is formed. This is the first relation. Secondly, we know that the molar mass of 253.80 g/mol, that is, every mole of I₂ has a mass of 253.80 g. This is the second relation.

Step 3: Apply relations to the data we have

$0.5235mol(CuCl_{2}).\frac{1mol(I_{2})}{2mol(CuCl_{2})} .\frac{253.80g(I_{2})}{1mol(I_{2})} =66.43g(I_{2})$

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3 years ago