A sealable bag holds 3.79 L of
gas. How many moles of H₂
gas are needed to fill the bag
at 1.0 atm and 293 K?

The Molar Concentration Of A =0.099 .

The Relative Molar Mass Of A = 35.0129 gm

Given,

Mass of HX = 3.5 g

Moles of solution B ([tex]Na_{2} CO_{3}[/tex]) = 0.05 moles

Volume of HX = 26.10 mL

Volume of Solution B = 25 mL

Molecular weight of solution B = 2(atomic weight of Na )+ atomic weight of C + 3(atomic weight of O)

                 = 2(23) + 12 + 3(16)

                 =106 gm

Equivalent weight of  [tex]Na_{2} CO_{3}[/tex] = molecular weight / 2 = 106 /2  =53 g

Mole = mass / molecular weight

∴0.05 = mass / 106

∴ mass = 5.3 gm [tex]Na_{2} CO_{3}[/tex]

Normality = mass ÷ (equivalent weight × volume of the solution in liter)

                = 5.3 ÷( 53 × 0.025)

                =4 N

So, by using formula ,

[tex]N_{1} V_{1} =N_{2} V_{2}[/tex]

[tex]N_{1}[/tex] = normality of solution B = 4 N

[tex]V_{1}[/tex] = volume of solution B = 25 mL

[tex]N_{2}[/tex] = normality of solution A = ? N

[tex]V_{2}[/tex] =Volume of solution A = 26.1 mL

∴ 4×25 = [tex]N_{2}[/tex] × 26.1

∴[tex]N_{2}[/tex] = 3.83 N

∴ normality of solution A = 3.83 N

from Formula of the normality we can find the equivalent weight of the A

Normality = mass of HX ÷ (equivalent weight × volume of the solution in liter)

3.83 = 3.5 ÷( equivalent weight × 0.0261)

∴equivalent weight = 35.0129 g

In case of HX the electron transfer is 1 ,so equivalent weight = molecular weight ; which is also termed as relative molar mass in given case.

∴The Relative Molar Mass Of A = 35.0129 g

Molar concentration = mass / molar mass

                               = 3.5 / 35.0129

                               = 0.099 mole

∴ The Molar Concentration of A  is 0.099 .

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Answer:

31536000

Explanation:

There are 31536000 seconds in a day.

60s x 60min x 24hrs x 365 days = 31536000sec

Answer:

Nothing will happen until you remove the thermometer.

Explanation:If the thermometer is made of mercury in glass, nothing will happen….mercury does not freeze at the temperatures in the refrigerator…

The theoretical yield of NaBr given that 2.36 moles of FeBr₃ reacts is 7.08 moles

2FeBr₃ + 3Na₂S → Fе₂S₃ + 6NaBr

From the balanced equation above,

2 moles FeBr₃ reacted to produce 6 moles of NaBr

From the balanced equation above,

2 moles FeBr₃ reacted to produce 6 moles of NaBr

Therefore,

2.36 moles FeBr₃ will react to produce = (2.36 × 6) / 2 = 7.08 moles of NaBr

Therefore,

Thus, the theoretical yield of NaBr is 7.08 moles

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Answer:

7.08

Explanation:

Answer:

0.057 M

Explanation:

To find the new molarity, you need to (1) find the moles (via the molarity equation using the old molarity and volume) and then (2) calculate the new molarity (via the molarity equation using the combined volume and old moles).

(Step 1)

60 mL / 1,000 = 0.06 L

Molarity (M) = moles / volume (L)

1.0 M = moles / 0.06 L

(1.0 M) x (0.06 L) = moles

0.06 = moles

(Step 2)

0.06 L + 1 L = 1.06 L

Molarity (M) = moles / volume (L)

Molarity = 0.06 moles / 1.06 L

Molarity = 0.057 M

The mass in grams of butane at standard room temperature is 53.21 grams.

The gram of an organic substance at room temperature can be determined by using the ideal gas equation which can be expressed as:

PV = nRT

1 × 22.4 L = n × (0.0821 atm*L/mol*K×  298 K)

n = 22.4/24.4658 moles

n = 0.91556 moles

Recall that:

mass of butane = 0.91556 moles × 58.12 g/mole

mass of butane = 53.21 grams

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solid : the molecules are tightly packed

liquid : the molecules have some space in them

gas : molecules can freely move around

Answer: A is unreactive and D is reactive.

Explanation:

A is neon, which is a noble gas, and thus unreactive.

D is sodium, which is an alkali metal, and thus highly reactive.

A spring tide occurs when there is a new or full moon in the solar system.

This is the type of tide which occurs when the sun, moon and earth are in line and occurs between three to four times per year.

Lunar and solar tides also line up and reinforce each other to produce this type of tide.

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Answer:

addition polymerization

Explanation:

Answer:

frequency = 2.07 x 10¹³ Hz

Explanation:

To find the frequency of the photon, you need to use the following equation:

E = hv

In this formula,

-----> E = energy (J)

-----> h = Planck's Constant (6.626 x 10⁻³⁴ J*s)

-----> v = frequency (Hz)

Since you have been given values for two of the variables (in the correct units), you can plug them into the equation and simplify to find the frequency.

E = hv                                                       <----- General Equation

E = (6.626 x 10⁻³⁴ J*s)v                           <---- Plug in Planck's Constant

1.37 x 10⁻²⁰ J = (6.626 x 10⁻³⁴ J*s)v        <----- Plug in energy (given)

2.07 x 10¹³ = v                                        <----- Divide both sides by 6.626 x 10⁻³⁴

Answer:

1.25 g C3H8

Explanation:

edge lol

Answer:

23,31 atm

Explanation:

p1v1 = p2v2

2.3 * 300  = p2 *29.6

p2=23.31 atm

Answer:

C. Ketones and aldehydes

Explanation:

they are both carbonyl functional group

they both have a carbon-oxygen double bond

testosterone is an example of a ketone

formaldehyde is an example of a aldehyde

opentextbcca

wikipedia

Answer:

Ketones and Aldehydes

Explanation:

i just took tha test

Any deviation in the image of an object when light passing from one medium to other is assciated to the phenomenon of refraction.

It is the deflection from a straight path undergone by a light ray while passing from one medium (such as air) into another (such as glass) in which its velocity is different.

Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.

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Answer:

Explanation:

Any deviation in the image of an object when light passing from one medium to other is assciated to the phenomenon of refraction.

What is refraction ?

It is the deflection from a straight path undergone by a light ray while passing from one medium (such as air) into another (such as glass) in which its velocity is different.

Basically, the light refraction gives the pencil a slight magnifying effect, which makes the angle appear bigger than it actually is, causing the pencil to look crooked.

After Looking at the pencil from the side of a clear glass or resealable plastic bag filled three-fourths with water, we will see the light bends around the pencil, causing it to look bent in the water.

When the pencil tilt from side to side, It looks so dramatically broken on looking at it from different angles.

We can magically “fix” the broken pencil by changing where the pencil is positioned in the glass.

Answer: 324 g (to 3 sf)

Explanation:

Based on the coefficients of the equation, we know that when 3.00 mol of water is consumed, 3.00 mol of carbon dioxide is also consumed.

Thus, the formula mass of carbon dioxide is:

[tex]6(15.9994)+12.011=108.0074[/tex] g/mol.

Thus, 3.00 mol has a mass of (108.0074)(3.00)=324 g (to 3 sf)

A closer look at the triple beam balance shows that mass of the body is 52.5 g.

The term triple beam balance refers to an equipment that is used to determine the mass of an object. It has three different degrees of calibration as shown.

In this case, if we look at the beam balance well, we can see that the mass of the body is 52.5 g.

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Explanation:

cudhdbsieehe eirbruwnee8ebeuw eodjsuww8

The number of grams of oxygen present in a sample of this compound that contains 40.00 grams of S = 29.9g of oxygen

The compound contains the following:

sulphur = 57.20%

Oxygen= 100 - 57.20 = 42.80%

If 57.20% of the sample contains 40g of sulphur then 42.80% of the sample will contain X.

Make X the subject of formula,

X = 42.8 × 40/57.20

X= 1712/57.20

X= 29.9g of oxygen

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Answer:

It is in the same phase as the reactants.

Explanation:

i took the test

Answer: Hypothalamus

Explanation:

The hypothalamus controls body temperature by sending signals to muscles, organs, glands, and other components of the nervous system when it becomes too low or too high. These structures then help in returning the body temperature to normal.

Answer:

D. C₄H₁₀ and C₂H₅

A chemical formula indicating the elements of a compound and their relative proportions, as (CH₂O)n.

Since an empirical formula indicates the ratio (proportions) of the elements in the compound, it can be used, along with the molar weight of the compound, to determine the molecular formula.

The empirical formula provides the smallest whole-number ratio among elements or compounds within a molecular compound. A compound is a chemical formed from atoms of different chemical elements.

Hence, Option D is correct.

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Answer:

1.) 0.1 M

2.) 0.2 M

3.) 1 M

4.) Solution #3 is the most concentrated because it has the highest molarity. This solution has the largest solute to solvent ratio. The more solvent there is, the lower the concentration and molarity.

Explanation:

To find the molarity, you need to (1) convert grams NaOH to moles (via molar mass from periodic table) and then (2) calculate the molarity (via the molarity equation). All of the answers should have 1 sig fig to match the given values.

Molar Mass (NaOH): 22.99 g/mol + 16.00 g/mol + 1.008 g/mol

Molar Mass (NaOH): 39.998 g/mol

4 grams NaOH           1 mole
----------------------  x  ------------------  = 0.1 moles NaOH
                                 39.998 g

1.)

Molarity = moles / volume (L)

Molarity = (0.1 moles) / (1 L)

Molarity = 0.1 M

2.)

Molarity = moles / volume (L)

Molarity = (0.1 moles) / (0.5 L)

Molarity = 0.2 M

3.)

Molarity = moles / volume (L)

Molarity = (0.1 moles) / (0.1 L)

Molarity = 1 M

Answer: Bubbles, burning, odor, color change, and rusting.

Explanation: Chemical changes are changes to something that is irreversible.

2.60 moles.

Zn (s) + 2 Ag+ (aq) --> 2 Ag (s) + Zn2+ (aq), each mole of zinc gives out two moles of silver. Therefore, 1.30 moles of zinc will displace 2.60 moles of silver. ( 1.30 × 2)

More about silver nitrate:

An inorganic substance with the chemical formula AgNO3 is silver nitrate. This salt serves as a flexible base for numerous different silver compounds, including those employed in photography. Compared to halides, it is far less light-sensitive. Lunar caustic was previously the name given to it since early alchemists referred to silver as luna and connected it to the moon.

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it's true. answer is B.

a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.

but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.

a proven hypothesis (a true hypothesis)is the reason for theories.

Answer:

it's true. answer is B.

a hypothesis is a stage before formation of theory. so when we put forward a hypothesis to prove something (in scientific observation) it can be proven true with the experiments conducted.

but of course it's can be proven wrong too, after the experiments conducted. then it is disregard.

a proven hypothesis (a true hypothesis)is the reason for theories.

Explanation:

hope this helps :)

The light emitted by an element when its electrons return to a lower energy state can be viewed as a bright line emission spectrum.

The distribution of electromagnetic radiation released by a substance whose atoms have been excited by heat or radiation.

A spectroscope can be used to determine which frequencies have been emitted by a substance.

An emission line will appear in a spectrum if the source emits specific wavelengths of radiation.

This emission occurs when an atom, element or molecule in an excited state returns to a configuration of lower energy.

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