What is the heat of a reaction, in joules, with a total reaction mixture volume of 73.0 mL if the reaction causes a temperature change of 4.4 oC in a calorimeter

Answer:

15. 2.5 M

16. 2.5 moles

17. 0.128 M

18. 56 g

Explanation:

15. Determination of the molarity of NaOH.

Mole of NaOH = 2.5 moles

Volume = 1 L

Molarity =?

Molarity = mole /Volume

Molarity of NaOH = 2.5 / 1

Molarity of NaOH = 2.5 M

16. Determination of the number of mole of solute.

Volume = 1 L

Molarity = 2.5 M

Mole of HCl =?

Molarity = mole /Volume

2.5 = mole of HCl /1

Mole of HCl = 2.5 moles.

17. Determination of the molarity of Na₂S

We'll begin by calculating the number of mole in 20 g of Na₂S. This can be obtained as follow:

Mass of Na₂S = 20 g

Molar mass of Na₂S = (23×2) + 32

= 46 + 32

= 78 g/mol

Mole of Na₂S =?

Molar = mass / molar mass

Mole of Na₂S = 20 / 78

Mole of Na₂S = 0.256 mole

Finally, we shall determine the molarity of Na₂S. This can be obtained as follow:

Mole of Na₂S = 0.256 mole

Volume = 2 L

Molarity of Na₂S =?

Molarity = mole /Volume

Molarity of Na₂S = 0.256 / 2

Molarity of Na₂S = 0.128 M

18. Determination of the mass of solute.

We'll begin by calculating the number of mole solute (CH₄) in the solution. This can be obtained as follow:

Volume = 1 L

Molarity of CH₄ = 3.5 M

Mole of CH₄ =?

Molarity = mole / Volume

3.5 = mole of CH₄ / 1

Mole of CH₄ = 3.5 moles

Finally, we shall determine the mass of the solute (CH₄). This can be obtained as follow:

Mole of CH₄ = 3.5 moles

Molar mass of CH₄ = 12 + (4×1)

= 12 + 4

= 16 g/mol

Mass of CH₄ =?

Mole = mass /Molar mass

3.5 = Mass of CH₄ / 16

Cross multiply

Mass of CH₄ = 3.5 × 16

Mass of CH₄ = 56 g

Answer:

The mass of 8.50 × 10²² NH₃ molecules is ≈ 1.84 g.

One mole of a molecule contains 6.02 × 10²³ molecules. The mass of  8.50 × 10²² molecules of NH₃ is 2.39 g.

Ammonia is an inorganic compound formed by hydrogen and nitrogen. Ammonia exists in gaseous state.

One mole of every element or compound contains 6.02 × 10²³ molecules. This number is called Avogadro number. The molar mass of ammonia is 17 g/l

It is given that the number of molecules of ammonia here, is 8.50 × 10²².

The no.of moles of ammonia = 8.50 × 10²²/ 6.02 × 10²³

                                                = 0.141 moles.

If one mole ammonia is 17 g/l, the mass of 0.141 moles of NH₃ is calculated as follows: 0.141 × 17 = 2.39 g. Hence the mass of NH3 which contains 8.50 × 10²² molecules is 2.39 g.

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Answer:

See explanation

Explanation:

For Fe;

Fe2+(aq) + 2H+(aq) + S2-(aq) ----> FeS(s) + H2(g)

For Ni

Ni2+(aq) + 2H+(aq) + S2-(aq) ----> NiS(s) + H2(g)

For Cr

2Cr3+(aq) + 6H+(aq) + 3S2-(aq) ----->Cr2S3(s) + 3H2(g)

We must remember that in writing these equations, the number of electrons lost or gained must be balanced. The number of electrons lost by the metal must equal the number of electrons gained by hydrogen. This rule was followed in writing all the equations above.

Answer:

Explanation:

Out of four given compounds , two will show cis-trans isomerism .

They are as follows ,

[Pt(NH₃)₂Cl₂]

and

[Cr(NH₃)₄Cl₂]+

see the attached file.

Basically, carbon (C2) burns in the presence of adequate Oxygen (O2) to form carbon dioxide. Carbon is Quadro valent and is able to accept four more electrons. Oxygen has two electrons and hence, readily reacts with carbon to help break and make bonds. The chemical equation of carbon dioxide (CO2) is

carbon + oxygen → carbon dioxide or C2 + O2 = CO2

Answer:

C

Explanation:

Because it is the question that represents than carbon in the presence of oxygen give carbon dioxide.

Answer:

A

Explanation:

Answer:

30 mph

Explanation:

Answer:

Explanation:

D = m/v

D = 2000/80 = 25

Answer:

d beacuse it uses lots of electricity

Answer:D

Explanation:

Answer:

[tex]C=0.662\frac{J}{g\°C}[/tex]

Explanation:

Hello!

In this case, since the heat removal when cooling down a body is computed via:

[tex]Q=mC\Delta T[/tex]

Given the removed heat, mass and temperature change, we solve for the heat capacity of the metal as shown below:

[tex]C=\frac{Q}{m\Delta T}[/tex]

Thus, by plugging in we obtain:

[tex]C=\frac{-68.5J}{4.5g*(25-48)\°C} \\\\C=0.662\frac{J}{g\°C}[/tex]

Best regards!

Answer:

4.000 (A)

Explanation:

Answer:

248 mL of 5% w/v boric acid solution should be used to obtain the solution needed.

Explanation:

We can calculate the volume of the 5% w/v boric acid solution needed to prepare the buffer solution 1.24% w/v using the following equation:

[tex] C_{i}V_{i} = C_{f}V_{f} [/tex]

Where:

[tex]C_{i}[/tex]: is the concentration of the initial solution = 5% w/v

[tex]C_{f}[/tex]: is the concentration of the final solution = 1.24% w/v

[tex]V_{i}[/tex]: is the volume of the initial solution =?

[tex]V_{f}[/tex]: is the volume of the final solution = 1 L

Hence, the volume of the 5% solution is:

[tex] V_{i} = \frac{C_{f}V_{f}}{C_{i}} = \frac{1.24 \%*1 L}{5 \%} = 0.248 L = 248 mL [/tex]

Therefore, 248 mL of 5% w/v boric acid solution should be used to obtain the solution needed.

I hope it helps you!                  

Answer:

The space shuttle was the result of committee compromise and political expediency. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).

Explanation:

Answer:

The space shuttle was the result of committee compromise and political expediency. In 1990 Scientists decided to launch the space shuttle. It was never the best design. It takes off like a rocket (and blows up like one on occasion) and lands like a plane (or rather, it lands like a brick with control surfaces).

Answer:

The answer is thomson

Explanation: he is the one that said it first and then after they tried to take credit  but thomson  is the correct answer.

Answer:

hello your question is incomplete attached below is the complete question

answer :

Fe2O3 = 159 g/mol

CO = 28.01 g/mol

Fe = 55.85 g/mol

CO2 = 44.01 g/mol

Explanation:

       Fe = 55.85 g/mol

       O = 16.0 g/mol

       hence the molar mass of Fe2O3 = 2(55.85) + 3(16) = 159 g/mol

        C = 12.01 g/mol

        O = 16.0 g/mol

        hence the molar mass of CO = 28.01 g/mol

        Fe = 55.85 g/mol

        C = 12.01 g/mol

        O = 16.0 g/mol

        hence the molar mass of CO2 = 12.01 + 2(16) = 44.01 g/mol

Answer:

There ya go ;)

Explanation:

Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3

Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3

In above statement we can understand that density, mass, and volume all are convert to each other it means that if we know any two variable then third one will be calculated easily.

Mathematically,

Formula for density will be as mentioned below:-

Density = Mass/Volume.

From above formula we can calculate mass which is as follows:-

Mass = Volume × Density.

S.I unit of mass is kilograms and C.G.S unit is gram.

And similarly we can calculate the volume which is equal to as follows:-

Volume = mass / density.

S.I unit of volume is meter cube and C.G.S unit is cubic centimeter.

So, we can say that mass, volume and density all are dependent to each other and if any two is known we can easily calculate the third one.

Therefore, Density is defined as the mass per unit volume it means that mass present in 1 meter cube. The S.I unit of density is kg/m^3 and in C.G.S and it is gram/cm^3.

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Answer:

yeah why?

Explanation:

Answer:

32.065 g

Explanation:

molecular weight of Sulfur or grams The molecular formula for Sulfur is S. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Sulfur, or 32.065 grams.

Answer:

an electrical generator

Answer:

Solubility

Explanation:

Answer:

Concentration

Explanation:

Quizlet

Answer:

A physical change has taken place

Answer:

If a substance changes color after being reacted with another substance, it means a chemical reaction has taken place.

Explanation:

A physical change is a change in the form, such as Ice Cream melting, or an Ice Cube melting.

The final temperature : 191.54 K = -81.46 °C

Given

V₁=3.2 L

T₁ = 125 +273 = 398 K

V₂=1.54 L

Required

The final temperature(T₂)

Solution

Charles's Law  

When the gas pressure is kept constant, the gas volume is proportional to the temperature  

[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]

T₂=(V₂T₁)/V₁

T₂=(1.54 x 398)/3.2

T₂=191.54 K = -81.46 °C

Answer:

The answer is Condensation which is water vapor in the air changes inot liquid water

Answer:

Sulfur

Explanation:

A non-metal in the third period that should have chemical properties similar to oxygen is sulfur.

This is because elements in the same group/family have similar chemical properties.

Answer:

1.12g/mol

Explanation:

The freezing point depression of a solvent for the addition of a solute follows the equation:

ΔT = Kf*m*i

Where ΔT is change in temperature (Benzonitrile freezing point: -12.82°C; Freezing point solution: 13.4°C)

ΔT = 13.4°C - (-12.82) = 26.22°C

m is molality of the solution

Kf is freezing point depression constant of benzonitrile (5.35°Ckgmol⁻¹)

And i is Van't Hoff factor (1 for all solutes in benzonitrile)

Replacing:

26.22°C = 5.35°Ckgmol⁻¹*m*1

4.90mol/kg = molality of the compound X

As the mass of the solvent is 100g = 0.100kg:

4.9mol/kg * 0.100kg = 0.490moles

There are 0.490 moles of X in 551mg = 0.551g, the molar mass (Ratio of grams and moles) is:

0.551g / 0.490mol

= 1.12g/mol

This result has no sense but is the result by using the freezing point of the solution = 13.4°C. Has more sense a value of -13.4°C.

Answer:

Enthalpy change is negative

Entropy change is Positive

Explanation:

Answer:

No necessarily it depends on if current is flowing through it.