A student caries out an experiment and dissolves 10.0 g of sodium bromide. NaBr, in 200g of water. What is the molality of the solution?

Answer:

What is the oxidation half reaction for iron?

The two elements involved, iron and chlorine, each change oxidation state; iron from +2 to +3, chlorine from 0 to -1. There are then effectively two half-reactions occurring. These changes can be represented in formulas by inserting appropriate electrons into each half-reaction: Fe2+ → Fe3+ + e.

Hope this helps..

Answer:

6.25

Explanation:

Because 2.5 is half and idk know how to explain but  yeah

Answer:

B. cloud formation

Explanation:

The event that will most likely occur is cloud formation. This is because Rising Air is the key process in the production of clouds and precipitation. This occurs because the air rises and as it rises it begins to expand, it expands so much so that the temperature of the air begins to decrease and humidity rises  until  cloud droplets begin forming as the excess water vapor condenses on the the air particles.

Answer:

Water that is present beneath the Earth's surface

Answer:

the answer is C Ozone

hope that helps

Answer:

The correct answer is 1.61 L.

Explanation:

Based on the given information, 3.712 grams of Mg reacts with 104.2 ml of 1.385 mol per L HCl at SATP, there is a need to find the amount of hydrogen gas produced in liters.  

The chemical reaction taking place in the given case is,  

Mg + 2HCl = MgCl2 + H2

The reacting moles of each reactants is,  

Moles of Mg = 3.712 g/24.305 g = 0.153 moles

Moles of HCl = 1.385 mol/L * 0.1042 L = 0.144 moles

From the reaction it is clear that Mg and HCl are present in 1:2 molar ratio. Therefore, 0.153 moles of Mg can completely react with 0.306 moles of HCl. However, the moles of HCl obtained in the given case is only 0.144 moles, thus, HCl is a limiting reactant.  

Now the moles of hydrogen produced is,  

n = 0.144 moles of HCl * (1 mole H2/2 mol HCl) = 0.072 moles

Finally to find the liters of hydrogen gas produced, the ideal gas equation is used, that is, PV = nRT

At STAP, the value of T is 273 K and pressure is 1 atm, the value of R is 0.082 atm.L/mol.L. Now putting the values we get,  

PV = nRT

V = nRT/P

V = 0.072 mol * 0.082 atm.L/mol.L*273/ 1 atm

V = 1.61 L

Answer:

[tex]V_2=188mL[/tex]

Explanation:

Hello,

In this case, for dilution processes, the initial moles must be the same to the final moles, therefore, only the volumes and molarities change from the beginning to the end of the dilution:

[tex]M_1V_1=M_2V_2[/tex]

In this case, we are asked to compute the new or final volume, so we simply solve for it as shown below:

[tex]V_2=\frac{M_1V_1}{M_2}=\frac{120mL*1.3M}{0.83M}\\ \\V_2=188mL[/tex]

Best regards.

Answer:

c

Explanation:

the rest are chemical properties

Answer: constant

Explanation:

Processes like nitrogen fixation, lightning, and the cycle results the nitrogen atmosphere to  remain less constant

Answer:

I think that the answer is N20:2(14.01)+1(16.06)=44.02g/mol(c) fluorine Di nitrogen monoxide contains how many mom 6.022 x

1023 mol N20

Answer:

C6H12O6

Explanation:

Just use the table method like I did and compared the molecular mass with the mass of the empirical formula.

Answer:

Option D.

Explanation:

Isomerism is a phenomenon where by two or more compounds have the same molecular formula but different structural patterns. The compounds involved are called isomers.

Option A has two different compound with two different molecular formula. Hence they are not isomers.

Option B has two different compound with two different molecular formula. Hence they are not isomers

Option C can not be called isomers because Isomerism can not occur in compound having just 1 carbon atom.

Option D has two different compound with the same molecular formula as C3H8O and their structure are different. Hence they areisomers.

Answer:

No

Explanation:

Are two atoms of the same element identical?

No they are not, for multiple reasons,

1) Heisenberg uncertainty principle: Electrons don't have a definite position, and direction of motion, at the same time. So we can only know of the two. Therefore the atoms are not identical in terms of the location or direction of motion at any fixed point in time.

2) Isotopes, while the number of protons in the nucleus determine the element, atoms of the same element can have different numbers of neutrons in their nuclei.

3) Electrons again, atoms can exist in energized states, therefore we may have a different number of electrons

Answer:

H2SO4 = 0.3885 mol L-1

Explanation:

We need (i) a stoichiometric equation:

H2SO4 + 2NaOH = NaSO4 +2H2O

1:2

And (ii) equivalent quantities of sodium hydroxide

Moles of NaOH  = 10x [tex]10^{-3}[/tex]L x 0.777mol [tex]L^{-1}[/tex] = 0.00777 mol

So H2SO4  = (0.5 x 0.00777 mol) / 0.001

= 0.3885 mol L-1

Answer:

[tex]n_{Na_2CO_3}=0.28molNa_2CO_3[/tex]

Explanation:

Hello,

In this case, the undergoing chemical reaction is:

[tex]Na_2CO_3(aq)+CaCl_2(aq)\rightarrow CaCO_3(aq)+2NaCl(aq)[/tex]

Hence, given the solution of calcium chloride, we can compute its reacting moles:

[tex]n_{CaCl_2}=0.35\frac{mol}{L}*803.1mL*\frac{1L}{1000mL}= 0.28molCaCl_2[/tex]

Thus, by knowing there is a 1:1 molar ratio between sodium carbonate and calcium chloride, we can easily compute the moles of sodium carbonate needed for a complete precipitation as shown below:

[tex]n_{Na_2CO_3}=0.28molCaCl_2*\frac{1molNa_2CO_3}{1molCaCl_2} \\\\n_{Na_2CO_3}=0.28molNa_2CO_3[/tex]

Best regards.

Answer:

80.0 mL

Explanation:

V1/V2 = T1/T2

T1 = 273 -123 = 150K

T2 = 273 +27 = 300 K

40.0 mL/V2 = 150K/300K

V2 = 40.0 mL*300K/150K = 80.0 mL

The volume that is occupied at 27°C, assuming pressure is constant is 80ml.

The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as

                          PV = nRT

where,

P = Pressure

V = Volume

T = Temperature

n = number of moles

Given,

Initial Volume = 40 ml

Initial temperature = -123°C = 273 - 123 = 150K

Final temperature = 27°C = 273 + 27 = 300K

From Charles' law,

V₁ / T₁ = V₂ / T₂

V₂ = (40 × 300) ÷ 150

= 80 ml

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Answer:

D. all of the above

Explanation:

Ice made from water is a solid because the atoms or molecules

- vibrate in place

- are unable to move around

- are closely packed and touching

In a solid, the atoms or molecules are unable to move around so they just vibrate in fixed positions and they are closely packed and touching.

Answer:

well person with a question it would be 356 an atom for eveyday of the year but every four years it would be 366 atoms

Explanation:

Answer:

The correct option is;

c. 0.167

Explanation:

The parameters given are;

The mean, μ = 13.9 Gigagrams/year

The standard deviation, σ = 5.8 Gigagrams/year

The z-score formula is given as follows;

[tex]z = \dfrac{x - \mu }{\sigma }[/tex]

Where:

x = Observed score = 11.5 Gigagrams/year

We have;

[tex]z = \dfrac{11.5 - 13.9 }{5.8 } = \dfrac{-2.4 }{5.8 } = 0.4138[/tex]

From the z-score table relations/computation, the probability (p-value) = 0.6605

Where:

x = Observed score = 14 Gigagrams/year

We have;

[tex]z = \dfrac{14- 13.9 }{5.8 } = \dfrac{0.1}{5.8 } = 0.01724[/tex]

From the z-score table relations/computation, the probability (p-value) = 0.4931

Therefore, the probability, [tex]p_{ca}[/tex], that the amount of carbon emissions from cars in Belgium for a randomly selected year are between 15.5 Gigagrams/year and 14 Gigagrams/year = The area under the normal curve bounded by the p-values for the two amounts of carbon emission

Which gives;

[tex]p_{ca}[/tex] = 0.6605 - 0.4931 = 0.1674 ≈ 0.167

Therefore, the correct option is c. 0.167.

Answer:

Deep partial-thickness wounds

Answer:

The product is hydrogen chloride gas

Volume of product = 800 ml

Explanation:

Equation of the reaction;

H2 + Cl2 ----> 2HCl

From the above balanced chemical equation, 1 mole of hydrogen gas, H2 reacts with 1 mole of chlorine gas, Cl2 to produce 2 moles of hydrogen chloride gas, HCl.

The mole ratio of reactants and products is 1 : 1 ---> :2

According to Gay-Lussac's law of combining volume which states that the volume of gases which take part in a chemical reaction bear a simple whole number ratio to one another and to the volume of products, if gaseous, at constant temperature and pressure.

Therfore, if 400 ml each of hydrogen and chlorine gas react, the product will be 2 * 400 ml of Hydrogen chloride gas = 800ml of hydrogen chloride gas

Answer:

C)We cannot be sure unless we find out its boiling point.

Explanation:

I will like to clearly state that simply comparing two compounds will not tell us exactly which one will be a liquid, solid or gas at room temperature.

If I want to determine whether an unknown substance will be a liquid at room temperature, I will have to measure its boiling point. If the boiling point is above room temperature, and the melting point is below room temperature, it’s a liquid. If the boiling point of the unknown substance is below room temperature, it is a gas.

This confirms that we cannot conclude on the state of matter in which a compound exists unless we know something about its boiling point, not by inspecting the properties of neighbouring compounds in the same homologous series

We cannot predict from this information provided whether C4H10, butane, will be a liquid at room temperature because We cannot be sure unless we find out its boiling point (option c)

Normally, Butane is a gas at room temperature and pressure. However too, if it is put under pressure, its boiling point rises. At a pressure of 2.13 x 105 Pa, its boiling point goes up to -25 °C which is obviously higher than room temperature. So, by putting butane at a pressure of just over 2 atm, it is a liquid at room temperature.

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Answer:

1. 2.17 dm3 VOLUME OF HCl IS PRODUCED WHEN 3.44 g OF Cl2 REACT AT STP

2. 4.87 MOLE OF Kr AT STP CONTAINS 109.088 dm3 .

3. THE PRESSURE WHEN 3.44 g OF Cl2 are reacted at 4.55 L AT 455 K IS 0.77 atm

Explanation:

1 Volume of HCl if 3.44 g of Cl2 are reacted at STP?

Equation for the reaction:

H2 + Cl2 ---------> 2HCl

1 mole of Cl2 reacts to form 2 mole of HCl

At STP, 1 mole of a gas is equal to the molar mass of the gas sample

35.5 * 2 g of Cl2 reacts to form 2 mole of HCl

3.44 g of Cl2 will react to form  ( 3.44 * 2 / 71 ) mole of HCl

= 0.0969 mole of HCl

1 mole of HCl = 22.4 dm3

0.0969 mole of HCl = ( 22.4 * 0.0969 / 1)

= 2.17056 dm3

The volume of HCl is 2.17 dm3 when 3.44 g of Cl2 are reacted at STP.

2. What volume does 4.87 mol of Kr have at STP?

1 mole of a substance is 22.4 dm3 of the sample

1 mole of Kr = 22.4 dm3

4.87 mole of  Kr = 4.87 * 22.4

= 109.088 dm3

4.87 mole of Kr at STP contains 109.088 dm3 volume

3. Whta pressure of HCl is generated if 3.44 g of Cl2 are reacted at 4.55 L at 455 K

Using the formula:

PV = nRT

V = 4.55 L

R = 0.082 L atm/ mol K

T = 455 K

m = 3.44 g

n = mass / molar mass

molar mass = ( 1 + 35.5) = 36.5 g/mol

n = 3.44 g / 36.5 g/mol

n = 0.094 mole

P = nRT / V

P = 0.094 * 0.082 * 455 / 4.55

P = 3.50714 / 4.55

P = 0.7708 atm

The pressure of HCl if 3.44 g of Cl2 are reacted at 4.55 L and 455 K is 0.7708 atm.

1. The volume of HCl generated is 2.15 L

2. The volume of 4.87 moles of Kr is 109.088 L

3. The pressure of HCl generated is 0.788 atm

1. Determination of the volume of HCl generated

Mass of Cl₂ = 3.44 g

Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol

Mole = mass / molar mass

Mole of Cl₂ = 3.44 / 71

H₂ + Cl₂ —> 2HCl

From the balanced equation above,

1 mole of Cl₂ reacted to produce 2 moles of HCl.

Therefore,

0.048 mole of Cl₂ will react to produce = 0.048 × 2 = 0.096 mole of HCl

At standard temperature and pressure (STP),

1 mole of HCl = 22.4 L

Therefore,

0.096 mole of HCl = 0.096 × 22.4 = 2.15 L

Thus, the volume of HCl generated at STP is 2.15 L

2. Determination of the volume of 4 moles of Kr at STP

At standard temperature and pressure (STP),

1 mole of Kr = 22.4 L

Therefore,

4.87 moles of Kr = 4.87 × 22.4 = 109.088 L

Thus, 4.87 moles of Kr has a volume of 109.088 L at STP

3. Determination of the pressure of HCl generated.

Number of mole (n) of HCl obtained = 0.096 mole

Volume (V) = 4.55 L

Temperature (T) = 455 K

Gas constant (R) = 0.0821 atm.L/Kmol

Pressure (P) =?

PV = nRT

P × 4.55 = 0.096 × 0.0821 × 455

P × 4.55 = 3.586128

Divide both side by 4.55

P = 3.586128 / 4.55

Thus, the of HCl generated is 0.788 atm

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the answer is 17.031 g/mol

Answer:

17.031 g/mol

Explanation:

hard to explanation

Answer:

Because graphite has delocalised electrons ,just like metal

Graphite is the allotrope of carbon. Allotropes are chemical compounds of the single element present and arranged in a complex form.

The uses of the graphite are as follows:-

Graphite the is allotropes of the carbon which means it has a free electron in the valence shell. In graphite, there is one free electron which moves from one place to another.

The movement of transferring the electron in the compound can allow the graphite to conduct heat.

Hence, the free electron is the answer.

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Answer:

Inertia in our body tends to be in the situation it is. So, we a car comes to a halt, our body wants to keep moving i.e. in motion. hope that helps love!

Answer:

ocean heats up and cools down relatively slowly. Therefore, areas near the ocean generally stay cooler