How many grams of propanol (C3H7OH, 60.10 g/mol) would be needed to make 750 mL of a solution with an osmotic pressure of 25 atm at 25°C? (R = 0.0821 L.atm/K.mol)

Answers

Answer 1

Answer: Answer:

= 46.06 grams

Explanation:

P=cRT

25 = c (0.0821)(298)

concentration = c = 1.021 M

number of moles = (1.021)(0.75) = 0.7664 moles

mass = (0.7664)(60.10)=40.06 grams

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Question 16 Unsaved Which of the following diagrams represents the correct cycling of gases?A) Photosynthesis O2 Respiration CO2
B) Respiration O2 photosynthesis CO2
C) Photosynthesis H2 Respiration O2
D) Respiration CO2 photosynthesis H2

Answers

the answer is A:

Photosynthesis release O2 (oxygen)

then animals use oxygen for respiration and release Co2

Final answer:

The correct answer is A) Photosynthesis O2 Respiration CO2. Photosynthesis converts CO2 to O2, which is then used in respiration to be converted back into CO2. Both processes together create a continuous cycle.

Explanation:

The correct diagram that represents the cycling of gases between photosynthesis and respiration is A) Photosynthesis O2 Respiration CO2. Through the process of photosynthesis, plants convert carbon dioxide (CO2) and sunlight into oxygen (O2) and glucose. Organisms, including the plants themselves, then use that oxygen for respiration, during which they convert the oxygen back into carbon dioxide. The glucose is used for energy. This continuous cycling plays a critical role in life on Earth.

Learn more about Cycling of gases here:

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What is the covalent bond for CO?

Answers

Answer:

Covalent bond or common bond is one of the types of chemical bonds. This connection arises from electronic participation. In fact, atoms that need to receive electrons to achieve stable electron arrangement (noble gas electron arrangement or octagonal arrangement) share electrons in their valence layer with other atoms. In this case, the transfer of electrons from one atom to another does not take place, but only a pair of electrons, called a bonded or shared electron pair, belongs to the nucleus of two atoms.

What is the isoelectric point of proteins?

Answers

Isoelectric point. The isoelectric point (pI, pH(I), IEP), is the pH at which a particular molecule carries no net electrical charge in the statistical mean. The standard nomenclature to represent the isoelectric point is pH(I), although pI is also commonly seen, and is used in this article for brevity.

The isoelectric point (pI, pH(I),IEP), is the pH at which a particular molecule carries no net electrical charge in the statistical mean.

The sulfuric acid–catalyzed reaction of isopentyl alcohol with acetic acid to form isopentyl acetate is performed. This reaction does not proceed to completion. After the reaction is heated under reflux for an hour, the product mixture is washed with aqueous sodium bicarbonate solution, and the organic layer is thoroughly dried. A distillation of the organic layer is then performed. Given the boiling points listed below, select the compound that will distill first.Compound Boiling point, ℃
acetic acid 118
isopentyl acetate 142
isopentyl alcohol 130
sulfuric acid water 290

Answers

Answer:

The correct option is acetic acid

Explanation:

Distillation is the process of separating a mixture of substances based on differences in boiling points. During distillation, the compound with the lowest/least boiling point is distilled and collected first and then the one with the next least boiling point and it goes on like that.

From the explanation above, acetic acid has the least boiling point (in the organic layer) with 118°C and thus will distill first. This is then followed by isopentyl alcohol (130°C) and then isopentyl acetate (142°C) and finally sulfuric acid water (290°C).

How many grams of NaCl are produced when 0.548 moles of Na react with excess Cl2 according to the reaction above?2Na + Cl2 --> 2NaCl

Answers

Answer:

$\boxed {\boxed {\sf 32.0 \ g \ NaCl}}$

Explanation:

To solve this problem, we must use stoichiometry: the calculation of reactants and products in a chemical reaction using ratios.

1. Analyze the Reaction

$2Na+Cl_2 \rightarrow 2 NaCl$

Check the coefficients, which indicate the moles required for the reaction. 2 moles of sodium (Na) and 1 mole of chlorine (Cl₂) produces 2 moles of sodium chloride (NaCl).

2. Set Up Ratios.

We are asked to find the grams of NaCl produced when 0.548 moles of Na react with excess chlorine.

We need 2 ratios: 1 for finding the moles of NaCl produced and 1 for converting to grams.

The first ratio is found using the coefficients. Since there is excess chlorine, we only need to focus on the sodium and sodium chloride. According to their coefficients, 2 moles of Na produce 2 moles of NaCl. This is the first ratio.

$\frac { 2 \ mol \ Na }{2 \ mol \ NaCl}$

The second ratio uses the molar mass. Since we are solving for the grams of NaCl, we have to find its molar mass.

First, locate these values on the Periodic Table for the individual elements.

Na: 22.989769 g/mol
Cl: 35.45 g/mol

There is 1 of each atom in 1 molecule, so we can add these values.

NaCl: 58.439769 g/mol

Use this value as the second ratio.

$\frac {58.439769 \ g \ NaCl}{1 \ mol \ NaCl}$

3. Calculate

Make 1 expression using the 2 ratios and the initial value of moles.

$0.548 \ mol \ Na * \frac { 2 \ mol \ Na }{2 \ mol \ NaCl} * \frac {58.439769 \ g \ NaCl}{1 \ mol \ NaCl}$

Flip the ratios so the correct units cancel out.

$0.548 \ mol \ Na * \frac { 2 \ mol \ NaCl }{2 \ mol \ Na} * \frac {58.439769 \ g \ NaCl}{1 \ mol \ NaCl}$

Multiply. Note that the moles of Na (units) cancel and the moles of NaCl (units). cancel.

$0.548 * \frac { 2 }{2 } * \frac {58.439769 \ g \ NaCl}{1}$

$\frac {0.548 *2* 58.439769 \ g \ NaCl}{2}$

$\frac {64.049986824 \ g \ NaCl}{2} =32.024993412 \ g\ NaCl$

The original value of moles has 3 significant figures, so our answer must have the same. For the number we found, that is the tenth place.

32.02499341232

The 2 in the hundredth place tells us to leave the 0.

$32.0 \ g \ NaCl$

0.548 moles of sodium react with excess chlorine to produce 32.0 grams of sodium chloride.

The correct electron configuration for magnesium is: 1s 22s 22p 63s 3 True False

Answers

Answer:

False

Explanation:

Magnesium is the element of second group and third period. The electronic configuration of magnesium is - 2, 8, 2 or $1s^22s^22p^63s^2$

There are 2 valence electrons of magnesium.

Only the valence electrons are shown by dots in the Lewis structure.

As, stated above, there are only two valence electrons of magnesium, so in the Lewis structure, two dots are made around the magnesium symbol.

Given that the electronic configuration is:- $1s^22s^22p^63s^3$ .

Orbital s cannot accommodate 3 electrons and also in magnesium it has $3s^2$ . Hence, the statement is false.

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