PLEASE HURRY. Which of the molecules below is propyne?

Answers

Answer 1

Answer:

Answer: Option (D) is the correct answer.

Explanation:

General formula of an alkyne is $C_(n)H_(2n-2)$ .

Suffix "yne" in the name of a compound represents that there is a triple bond present in the compound.

So, a molecule of propyne will have three carbon atoms, four hydrogen atoms and a triple bond. Therefore, there wll be 6 sigma bonds and 2 pi bonds in a propyne molecule.

Answer 2

Answer:

The last photo because its molecular formula is C3H4.

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Answers

HELIUM
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CARBON DIOXIDE
HYDROGEN

Argon,Carbon dioxide,Neon,Helium, and Methane

1. What is the volume of 0.900 moles of an ideal gas at 25.0° C and a pressure of 950.0 mm Hg?1.50 liters
17.6 liters
18.0 liters
34.2 liters

2. What is the pressure, in mm Hg, of 2.50 moles of an ideal gas if it has a volume of 50.0 liters when the temperature is 27.0° C?
84.2 mm Hg
289 mm Hg
617 mm Hg
936 mm Hg

3. When 12.4 grams of KBr are dissolved in enough water to create a 170-gram solution, what is the solution's concentration, expressed as a percent by mass?
6.2% KBr
6.8% KBr
7.3% KBr
7.9% KBr

Answers

1. Using the ideal gas law, which states that PV = nRT, and remembering that absolute temperature must be used:
(950.0 mmHg)(V) = (0.900 moles)(R)(25.0 + 273.15 K)
The most convenient value of R is 0.08206 L-atm/mol-K, so we convert the pressure of 950.0 mmHg to atm by dividing by 760: 1.25 atm
(1.25 atm)(V) = (0.9)(0.08206)(298.15)
V = 17.6 L

2. Again using the ideal gas law, and converting temperature to Kelvin: 27 + 273.15 = 300.15 K
PV = nRT
P(50.0 L) = (2.50 moles)(0.08206 L-atm/mol-K)(300.15 K)
P = 1.23 atm
Then we multiply by 760 mmHg / 1 atm = 936 mmHg. This is the fourth of the choices.

3. If the complete solution has a mass of 170 grams, and 12.4 grams of it is the dissolved KBr, we simply have to divide the mass of solute (KBr) by the total mass of the solution: This gives us 12.4 grams / 170 grams = 0.0729. Multiplying by 100% gives 7.29% or approximately 7.3% KBr, which is the third of the choices.

1. The volume of the ideal gas is $\boxed{{\text{17}}{\text{.6 L}}}$ .

2. The pressure of the ideal gas is $\boxed{{\text{936 mm Hg}}}$ .

3. The concentration of the solution, expressed as mass percent is $\boxed{{\text{7}}{\text{.3 \% }}}$ .

Further Explanation:

An ideal gas is a hypothetical gas that is composed of a large number of randomly moving particles that are supposed to have perfectly elastic collisions among themselves. It is just a theoretical concept and practically no such gas exists. But gases tend to behave almost ideally at a higher temperature and lower pressure.

Ideal gas law is the equation of state for any hypothetical gas. The expression for the ideal gas equation is as follows:

${\text{PV}} = {\text{nRT}}$ .......(1)

Here,

P is the pressure of ideal gas.

V is the volume of ideal gas.

T is the absolute temperature of the ideal gas.

n is the number of moles of the ideal gas.

R is the universal gas constant.

1. Rearrange equation (1) to calculate the volume of the ideal gas.

${\text{V}}=\frac{{{\text{nRT}}}}{{\text{P}}}$ ......(2)

The pressure of the ideal gas is 950 mm Hg.

The temperature of the ideal gas is ${\text{25}}\;^\circ{\text{C}}$ .

The number of moles of the ideal gas is 0.9 mol.

The universal gas constant is 0.0821 L atm/K mol.

Substitute these values in equation (2).

$\begin{aligned}{\text{V}}&=\frac{{\left( {{\text{0}}{\text{.9 mol}}} \right)\left( {0.0821{\text{ L atm/K mol}}} \right)\left( {25 + 27{\text{3}}{\text{.15}}}\right){\text{K}}}}{{\left( {950{\text{ mm Hg}}}\right)\left( {\frac{{{\text{1 atm}}}}{{760{\text{ mm Hg}}}}}\right)}}\n&= 17.624{\text{ L}}\n&\approx {\text{17}}{\text{.6 L}}\n\end{aligned}$

Therefore the volume of the ideal gas is 17.6 L.

2. Rearrange equation (1) to calculate the pressure of ideal gas.

${\text{P}} =\frac{{{\text{nRT}}}}{{\text{V}}}$ ......(3)

The volume of the ideal gas is 50 L.

The temperature of the ideal gas is ${\text{27}}\;^\circ {\text{C}}$ .

The number of moles of the ideal gas is 2.5 mol.

The universal gas constant is 0.0821 L atm/K mol

Substitute these values in equation (3).

$\begin{aligned}{\text{P}}&= \frac{{\left( {{\text{2}}{\text{.5 mol}}} \right)\left( {0.0821{\text{ L atm/K mol}}} \right)\left( {27 + 27{\text{3}}{\text{.15}}} \right){\text{K}}}}{{{\text{50 L}}}}\n&= 1.2321{\text{ atm}}\n&\approx 1.232{\text{ atm}}\n\end{aligned}$

The pressure is to be converted into mm Hg. The conversion factor for this is,

${\text{1 atm}} = {\text{760 mm Hg}}$

So the pressure of ideal gas can be calculated as follows:

$\begin{aligned}{\text{P}} &= \left({{\text{1}}{\text{.232 atm}}}\right)\left( {\frac{{{\text{760 mm Hg}}}}{{{\text{1 atm}}}}}\right)\n&= 936.3{\text{2 mm Hg}} \n&\approx 93{\text{6 mm Hg}}\n\end{aligned}$

Therefore the pressure of the ideal gas is 936 mm Hg.

3. The formula to calculate the mass percent of KBr is as follows:

${\text{Mass}}\;{\text{percent}}=\left( {\frac{{{\text{Mass of KBr}}}}{{{\text{Mass of solution}}}}}\right)\left( {100} \right)$ ......(4)

The mass of KBr is 12.4 g.

The mass of the solution is 170 g.

Substitute these values in equation (4).

$\begin{aligned}{\text{Mass}}\;{\text{percent}}&= \left( {\frac{{{\text{12}}{\text{.4 g}}}}{{{\text{170 g}}}}} \right)\left( {100} \right)\n&= 7.294\;\% \n&\approx 7.{\text{3 \% }}\n\end{aligned}$

Therefore the concentration of the solution is 7.3 %.

Learn more:

1. Which statement is true for Boyle’s law: brainly.com/question/1158880

2. Calculation of volume of gas: brainly.com/question/3636135

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Mole Concept

Keywords: P, V, n, R, T, ideal gas, pressure, volume, 17.6 L, 936 mm Hg, 7.3 %, 0.9 mol, 950 mm Hg, 50 L, 2.5 mol, 12.4 g, 170 g, KBr

Complete the passage about metallic bonding.

Answers

Answer:

some bonds are broken and new ones are formed. Now you are ready to learn more about those bonds. Chemical bonds are attractions between atoms. They are simply attractive forces (between the + nucleus of one atom and the - electrons of a neighboring atom) that hold groups of atoms together and make them function as a unit.

Answer:2

Explanation:23s

View the table.Which would be the most appropriate headers for column
1 and column 2?
1
sugar
ice
diamond
S
AS
rubber
wax
plastic
column 1 Atoms
column 2. lons
column 1 Crystalline
column 2 Noncrystalline
column 1. Definite shape
column 2. Definite volume
column 1 Viscous
column 2 Nonviscous

Answers

Answer:

column 1: they are solids that form crystals.

column 2: Are liquid solutions.

Explanation:

Crystals are solids, some of them can have viscosity like glass.

Liquid solutions, are formed by some ions dissolved in water, so they can have a definite volume and could be a liquid that is nonviscous because they are dissolved in water.

Hope this info is useful.

Answer:n creating a table from a dataset that does not have a column and a row, the most important thing that you have to ... The answer to your question is C. column headers.

Explanation:

Are most elements on the periodic table nonmetals?

Answers

wouldn’t say most but yes

Final answer:

No, most elements on the periodic table are not nonmetals. About 75% of the elements on the periodic table are metals, with nonmetals including the Noble Gases, Halogens, Nitrogen and Oxygen making up a smaller portion. Additionally, the Metalliods, which are elements with properties of both metals and nonmetals, also hold a place on the periodic table.

Explanation:

No, most elements on the periodic table are not nonmetals, but rather metals. The periodic table is primarily comprised of metals, with the so-called 'metal' elements making up about 75% of the table's total elements. Nonmetals count for only a small part, located on the right side of the table. They include the Noble Gases, the Halogens, and some others like Nitrogen and Oxygen

Furthermore, there are a group of elements known as the Metalliods or Semi-Metals which have properties in between metals and nonmetals. These are located in a diagonal line from Boron to Astatine.

Learn more about Periodic Table here:

brainly.com/question/35461104

#SPJ6

Are the following physical or chemical changes.1.Lighting a match
2.Cooking waffles
3.Baking a cake

Answers

They are all chemical changes. Think of a chemical change as you can never get something back to the way it was. (A lit match can't be turned back into a new one, waffles can't be turned back into waffle mix, and a cake can't be turned back into cake batter.)

Physical change would be something like slicing cheese or evaporating water. (The sliced cheese is still cheese, and the water turns into steam which can then be turned back into a liquid and it's still water - just in the air.)

chemical reactions because the chemical formula is changed in the reaction