How many milliliters of a 12% (v/v) propyl alcohol solution would you need to obtain 7.5 mL of propyl alcohol? Answer to the tenth

Yes. If you lower the temperature of a test tube of water slowly, the water can remain liquid if it is not disturbed. As soon as the super cold water is disturbed the water will start crystalizing at a nucleation point and will convert to ice very quickly.

Molecules and the moles can be interconverted into each other with the help of the Avogadro's number. In 8.5 x 10⁻² moles of hydrogen fluoride, there are 51.17 × 10²¹ molecules.

Avogadro's number is the special number that converts the moles into molecules and vice versa. The value of the Avogadro's number is 6.02 x 10²³.

If 1 mole of HF has 6.02 x 10²³ molecules then,

8.5 x 10⁻² moles of HF will have:

(8.5 x 10⁻²) × 6.02 x 10²³) = 51.17 × 10²¹

Therefore, 51.17 × 10²¹ molecules are present in HF.

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Answer:

34.5J

Explanation:

Amount of Heat(Q) = mc∆T

where m (mass of aluminum) = 5.50g

c (specific heat capacity of aluminum) = 0.897J/g°C and ∆T = 95.0°C - 25.0°C = 70.0°C

Q = 5.50x 0.897x 70.0

= 34.5354J = 34.5J

The amount of heat absorbed when 5.50 g of aluminum is heated from 25.0°C to 95.0°C is 34.5 J.

Heat is defined as a form of the energy transmitted from one body to another as a result of a temperature difference.

It can also be defined as the potential energy stored in the bonds that hold the object's particles together.

Heat absorption is defined as absorption of heat without increasing the temperature at the certain point.

Amount of heat = mcΔT

Where m = 5.50g

           c = 0.897 J/g °C

           ΔT =  95.0°C - 25.0°C

                 = 70.0°C

So, amount of heat = 5.50 x 0.897 x 70.0

                                = 34.5354 J = 34.5 J

Thus, the amount of heat absorbed when 5.50 g of aluminum is heated from 25.0°C to 95.0°C is 34.5 J.

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Answer:

base

Explanation:

bases have a phone scale more than 7

Answer: The high temperature raises the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.

Answer:

D. The high temperature raises the volume of air inside the ball according to Charles's law because this law describes how a gas will behave at constant pressure.

Explanation:

I took the exam

The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.

W = mg

Weight of object = mass of object × acceleration of gravity

The Gibbs Free Energy at 298 K, AH = 46 kJ/mol and sº = 0.097 kJ/(K-mol) is 28.906 kJ/mol

It serves as the single master variable that determines whether a given chemical change is thermodynamically possible.

Thus if the free energy of the reactants is greater than that of the products, the entropy of the world will increase when the reaction takes place as written, and so the reaction will tend to take place spontaneously.

Conversely, if the free energy of the products exceeds that of the reactants, then the reaction will not take place in the direction written, but it will tend to proceed in the reverse direction.

At 298 K,

AH = 46 kJ/mol

and sº = 0.097 kJ/(K-mol).

ΔG=ΔH−T⋅ΔS

ΔG = 46 - 298 * 0.097

ΔG = 46 - 28.906

ΔG = 28.906 kJ/mol

The Gibbs Free Energy at 298 K, AH = 46 kJ/mol and sº = 0.097 kJ/(K-mol) is 28.906 kJ/mol

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Answer: A

Explanation: just did it

Selenium chloride has a molar mass of 149.86 g/mol. The mass of selenium dichloride in grams is 29.22 grams.

Mass is the quantity of matter of a physical body.

The molar mass is given 149.86 g/mol

The number of moles is 0.195

By the formula of molar mass

[tex]\rm Molar\;mass = \dfrac{mass}{number\;of\;moles} \\\\\rm mass = molar mass \times number\;of\;moles\\\rm mass =149.86 \times 0.195 = 29.22 g[/tex]

Thus, the mass of selenium dichloride in grams is 29.22 grams.

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Answer:

lithium lithium (or 2lithium) + oxygen ->

Explanation:

Your welcome

The number of moles in 72 gram H₂O is 3.942 MOL.

The mole is a SI unit of measurement that is used to calculate the quantity of any substance.

First, know the molar mass of water.

The given mass is 71 gram

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{71}{18.01}= 3.942 mol[/tex]

Thus, the number of moles in 72 gram H₂O is 3.942 MOL.

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Answer:

Explanation:

SI unit is an international system of measurements that are used universally in technical and scientific research to avoid the confusion with the units. Having a standard unit system is important because it helps the entire world to understand the measurements in one set of unit systems.

Unit of Electric Charge: Unit of Wavelength

Unit of Mass: Unit of Velocity:

Answer:

mass is always constant for a body.

Explanation:

one way to calculate mass is Mass=Volume ×Density

The correct structure that corresponds to the name in the image above is structure A. Details about hydrocarbons can be found below.

Alkanes are organic compound that belongs to any acyclic saturated hydrocarbon e.g. methane, ethane, etc.

Alkanes have a single carbon bond and can be attached to by certain compounds. Methyl is a compound with the formula; CH3.

Therefore, the correct structure that corresponds to the name in the image above is structure A.

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Answer:

C

Explanation:

It was right on acellus

The energy comes from the sun, captured through photosynthesis.

Individual marble:

Answer:

Individual Marble

Use the formula 4/3_?_ R^3, to solve for the volume. Here, R is the radius, or half of D. ^3 means the radius is cubed.

Explanation:

Answer:

b. Run FASTER than normal.

Explanation:

Standard temperature is 273 K or 0°C.

Hence, running the reaction at 60°C, which is higher than normal, would cause the reaction to run faster than normal.

Answer:

67.2 litres of oxygen will be consumed

Explanation:

Step 1 : Write the balanced chemical equation:

2H₂ + O₂ → 2H₂O

Step 2: find the ratio of O₂ : H₂O

O₂ : H₂O

1 : 2

67.2 : 33.6

Thus, 67.2 litres of oxygen will be consumed

Moles are the divisional of the mass and the molar mass. In 13.95 gms of calcium, there are 0.348 moles.

In chemistry, moles are the measurement units that are used to estimate the small entities of the atoms or the molecules. Moles are calculated as:

Moles = mass ÷ molar mass

We know,

The molar mass of calcium = 40 gm/mol

The mass of calcium = 13.95 gms

Moles of calcium are calculated as:

Moles = 13.95 ÷ 40

= 0.348 moles

Therefore, in 13.95 gms 0.348 moles of calcium is present.

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Answer:

Hydrogen chloride is a mixture of hydrogen and chlorine elements. The chemical abbreviation of hydrochloric acid is HCl.

Explanation:

Answer:

2000pound

Explanation:

Manganese metal is produced from the manganese(III) oxide, Mn2O3, which is found in manganite, a manganese ore. The manganese is reduced from its +3 oxidation state in Mn2O3 to the zero oxidation state of the uncharged metal by reacting the Mn2O3 with a reducing agent such as aluminum or carbon. How many pounds of manganese are in 1.261 tons of Mn2O3? (1 ton = 2000 pounds)

About 40 different substances called organophosphorus compounds are registered in the United States as insecticides. They are considered less damaging to the environment than some other insecticides because they breakdown relatively rapidly in the environment. The first of these organophosphorus insecticides to be produced was tetraethyl pyrophosphate, TEPP, which is 33.11% carbon, 6.95% hydrogen, 38.59% oxygen, and 21.35% phosphorus. It has a molecular mass of 290.190.

A quantity can be converted from one unit of measurement to another while maintaining its value. There are 2522 pounds of manganese in 1.261 tons of [tex]\rm Mn_2O_3[/tex].

It is a fundamental idea that is applied in many different disciplines such as science, engineering, math and daily life. To complete a conversion, it is necessary to know the conversion factor – the numerical relationship between the two units of measurement. With the help of this factor, you are able to convert units while keeping the value constant.

To convert tons to pounds we need to know that 1 ton is equal to 2000 pounds.

Given that you have 1.261 tons of [tex]\rm Mn_2O_3[/tex], we can calculate the number of pounds as follows:

Number of pounds = 1.261 tons * 2000 pounds/ton

Number of pounds = 2522 pounds

Therefore, there are 2522 pounds of manganese in 1.261 tons of [tex]\rm Mn_2O_3[/tex].

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Answer:

About 512 g.

Explanation:

We are given a sample of P₂Cl₅ that contains 179 grams of phosphorus, and we want to determine the grams of chlroine that is present.

Thus, we can convert from grams of phosphorus to moles of phosphorus, moles of phosphorus to moles of chlorine, and moles of chlorine to grams of chlorine.

From the formula, there are two moles of P for every five moles of Cl. The molecular weights of P and Cl are 30.97 g/mol and 35.45 g/mol, respectively. Hence:

[tex]\displaystyle 179\text{ g P} \cdot \frac{1\text{ mol P}}{30.97\text{ g P}} \cdot \frac{5\text{ mol Cl}}{2\text{ mol P}} \cdot \frac{35.45\text{ g Cl}}{1\text{ mol Cl}} = 512\text{ g Cl}[/tex]

In conclusion, there is about 512 grams of chlorine present in the sample.

Alternatively, we can mass percentages. The mass percent of phosphorus in P₂Cl₅ is:

[tex]\displaystyle \% \text{P} = \frac{2(30.97)}{5(35.45) + 2(30.97)} = 25.90\%[/tex]

Because there are 179 grams of phosphorus, the total amount of sample present is:

[tex]\displaystyle \begin{aligned} 25.90\% \cdot m_T & = 179\text{ g P} \\ \\ m_T & = 691.1 \text{ g}\end{aligned}[/tex]

Therefore, the amount of chlorine present is 691.1 g - 179 g, or about 512 g, in agreement with our above answer.

Two molecules having different sizes but the same functional groups will take part in chemical reactions. Functional groups are used in the field of organic chemistry. Here the given molecule has ketone functional group. The correct option is D.

The substituent atoms or groups of atoms which are attached to specific molecules are defined as the functional groups. These moieties are responsible for the chemical reactions. The same functional group will experience comparable reactions regardless of the chemical in which it is present.

A ketone is a functional group which consists of a carbonyl carbon bound to an oxygen atom by a double bond and two alkyl or aryl groups. Ketones are usually represented as RCOR, where two R's can be any alkyl or aryl group. Their general formula is CₙH₂ₙO.

Lower ketones are soluble in water because they consist of the polar carbonyl group.

Thus the correct option is D.

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Answer:

A + B → C + D + heat

Explanation:

A. A+B+heat⇒C+D

In an endothermic reaction, the system requires energy/heat, the enthalpy change is positive.

a mixture can be separated by a filter

Answer:

= 0.524M

Explanation:

data;

volume = 490ml

              = 490 / 1000

               = 0.49 dm^3

moles = 0.257 moles

molarity = ?

solution:

molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]

               = 0.257 / 0.49

 molarity  = 0.524M