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Leya [2.2K]
4 years ago
3

A 0.674\,\text M0.674M0, point, 674, start text, M, end text cobalt(II) chloride (\text{CoCl}_2CoCl 2 ​ start text, C, o, C, l,

end text, start subscript, 2, end subscript) solution is prepared with a total volume of 0.0750\,\text{L}0.0750L0, point, 0750, start text, L, end text. The molecular weight of \text{CoCl}_2CoCl 2 ​ start text, C, o, C, l, end text, start subscript, 2, end subscript is 128.9\,\dfrac{\text{g}}{\text{mol}}128.9 mol g ​ 128, point, 9, start fraction, start text, g, end text, divided by, start text, m, o, l, end text, end fraction.
Chemistry
1 answer:
Amanda [17]4 years ago
5 0

Answer:

The mass of this CoCl2 sample is 6.516 grams

Explanation:

Step 1: Data given

Molarity of a cobalt(II) chloride (CoCl2) solution is 0.674 M

Volume of the solution is 0.0750 L

The molecular weight of CoCl2 is 128.9 g/mol

Step 2: Calculate moles CoCl2

Moles CoCl2 = molarity CoCl2 solution * volume solution

Moles CoCl2 = 0.674 M * 0.0750 L

Moles CoCl2 = 0.05055 moles

Step 3: Calculate mass of the CoCl2 sample

Mass CoCl2 = moles CoCl2 * molar mass CoCl2

Mass CoCl2 = 0.05055 moles * 128.9 g/mol

Mass CoCl2 = 6.516 grams

The mass of this CoCl2 sample is 6.516 grams

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An experiment was conducted to determine if the intermolecular forces in two liquids affects their boiling points. Each liquid w
wariber [46]

Given the partial record of the experiment, the information that should be recorded in the last column of the table is B. Time is taken by the glass surface to dry.

<h3>What is an intermolecular force?</h3>

These are forces of attraction between atoms, molecules, and ions when they are placed close to each other.

Intermolecular forces are electrostatic in nature, and this means that they arise from the interaction between positively and negatively charged species.

Hence, an intermolecular force acts between molecules and their examples are London dispersion forces, dipole-dipole interaction, ion-dipole interaction, and van der Waals forces.

Read more about <em>intermolecular forces</em> here:

brainly.com/question/2193457

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The complete question

An experiment was conducted to determine if the intermolecular forces in two liquids affect their boiling points. Each liquid was sprayed on a paper towel. Each paper towel was wiped across a glass table to moisten the surface. The table shows a partial record of the experiment.

Experimental Record

Liquid Intermolecular Forces ?

А relatively strong

B relatively weak

What information should be recorded in the last column of the table?

Time is taken by the liquids to start boiling

Time is taken by the glass surface to dry

The volume of liquid required to moisten the paper towels

Time taken by the paper towels to become completely moist

6 0
2 years ago
Aspirin (C9H8O4) is synthesized by reacting salicylic acid (C7H6O3) with acetic anhydride (C4H6O3). The balanced equation isC7H6
prisoha [69]

<u>Answer:</u>

<u>For a:</u> The mass of acetic anhydride needed is 73.91 grams.

<u>For b:</u> The theoretical yield of aspirin is 130.43 grams.

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}   .....(1)

  • <u>For a:</u>

Given mass of salicylic acid = 1.00\times 10^2g=100g

Molar mass of salicylic acid = 138.121 g/mol

Putting values in equation 1, we get:

\text{Moles of salicylic acid}=\frac{100g}{138.121g/mol}=0.724mol

For the given chemical reaction:

C_7H_6O_3+C_4H_6O_3\rightarrow C_9H_8O_4+CH_3COOH

By stoichiometry of the reaction:

1 mole of salicylic acid reacts with 1 mole of acetic anhydride.

So, 0.724 moles of salicylic acid will react with = \frac{1}{1}\times 0.724=0.724mol of acetic anhydride.

Now, to calculate the mass of acetic anhydride, we use equation 1:

Moles of acetic anhydride = 0.724 moles

Molar mass of acetic anhydride = 102.09 g/mol

Putting values in equation 1, we get:

0.724mol=\frac{\text{Mass of acetic anhydride}}{102.09g/mol}\\\\\text{Mass of acetic anhydride}=73.91g

Hence, the mass of acetic anhydride needed is 73.91 grams.

  • <u>For b:</u>

By stoichiometry of the reaction:

1 mole of salicylic acid is producing 1 mole of aspirin.

So, 0.724 moles of salicylic acid will produce = \frac{1}{1}\times 0.724=0.724mol of aspirin.

Now, to calculate the mass of aspirin, we use equation 1:

Moles of aspirin = 0.724 moles

Molar mass of aspirin = 180.158 g/mol

Putting values in equation 1, we get:

0.724mol=\frac{\text{Mass of aspirin}}{180.158g/mol}\\\\\text{Mass of aspirin}=130.43g

Hence, the theoretical yield of aspirin is 130.43 grams.

4 0
4 years ago
How does the aufbau principle, in connection with the periodic law, lead to the format of the periodic table?
Firdavs [7]

Afbau principle states that the electrons are filled in the orbital according to their energy level. Lower energy shells are first filled and then higher energy shell are filled.

The order of filling of orbitals are s-p-d-f.

So, elements with last electron in respective orbitals show similar properties. And this serves as the basis of format of periodic table.

7 0
3 years ago
2)
Ivahew [28]

Answer:

B

Explanation:

From Celsius to Kelvin add 273

From Kelvin yo Celsius subtract 273

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4 0
3 years ago
If the [H+] in a solution is 1 × 10–1 mol/L, what is the [OH–]?
SVEN [57.7K]
You need to know the following equations:
pH=-log[H⁺]
pOH=-log[OH⁻]
pH+pOH=14
then you can find the pH by using pH=-log(1×10⁻¹)
pH=1
then you can find pOH by doing pOH=14-1
pOH=13
then you can find [OH] by using [OH⁻]=10^(-pOH)
[OH⁻]=1×10⁻¹³mol/L

You could also use the equation Kw=[OH⁻][H⁺] where Kw=10⁻¹⁴
10⁻¹⁴/10⁻¹=10⁻¹³mol/L

I hope this helps.  Let me know if anything is unclear.
5 0
3 years ago
Read 2 more answers
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