CHEMISTRY HIGH SCHOOL

Which compound has the highest melting point? A) octane (C8H18), a molecular compound
B) carbon dioxide (CO2), a common gas
C) water (H2O)
D) silicon carbide (SiC), a network solid

Answers

Answer 1
Answer: I think b carbon dioxide

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A student determines that according to the reaction N2(g) + 3H2(g) --> 2NH3(g), if 34g of nitrogen gas is reacted with excess hydrogen, 41g of ammonia can be produced. When the actual reaction was complete, only 38g of ammonia formed. Determine the percent yield for the reaction.

Answers

Answer:

The percent yield of this reaction is 92.7 %

Explanation:

Step 1: Data given

Mass of nitrogen gas (N2) = 34.0 grams

Mass of ammonia (NH3 produced = 41.0 grams

Molar mass of N2 = 28.0 g/mol

Molar mass of NH3 = 17.02 g/mol

Actual yield of ammonia = 38 grams

Step 2: The balanced equation

N2(g) + 3H2(g) → 2NH3(g)

Step 3: Calculate moles

Moles = mass / molar mass

Moles N2 = 34.0 grams / 28.0 g/mol

Moles N2 = 1.214 moles

Step 4: Calculate moles NH3

For 1 mol N2 we need 3 moles H2 to produce 2 moles NH3

For 1.214 moles N2 we'll have 2* 1.214 = 2.428 moles NH3

Step 5: Calculate mass NH3

Mass NH3 = moles * molar mass

Mass NH3 = 2.428 moles * 17.02 g/mol

Mass NH3 = 41 grams

Step 6: Calculate percent yield for the reaction

Percent yield = (actuald yield / theoretical yield) * 100 %

Percent yield = (38 grams / 41 grams ) * 100 %

Percent yield = 92.7 %

The percent yield of this reaction is 92.7 %

Answer:

Y=92\%

Explanation:

Hello,

In this case, by considering the given chemical reaction, with given mass of nitrogen, one could compute the theoretical yield of ammonia as shown below and considering their 1 to 2 molar relationship in the chemical reaction:

m_(NH_3)^(theoretical)=34gN_2*(1molN_2)/(28gN_2)*(2molNH_3)/(1molN_2)*(17gNH_3)/(1molNH_3) \nm_(NH_3)^(theoretical)=41.3gNH_3

In such a way, the percent yield is obtained as shown below:

Y=(m_(NH_3)^(actual))/(m_(NH_3)^(theoretical)) *100\%=(38g)/(41.3g) *100\%\n\nY=92.0\%

Best regards.

What describes a change in velocity?

Answers

Acceleration can be described as changes in speed, changes in direction, or changes in both. Acceleration is a vector.

Velocity is the displacement made per unit of time.

If direction or speed of the object change it causes change in velocity.

Acceleration is the term used for measuring the change of velocity. Acceleration is the change of velocity per unit of time.

What is the freezing point of an aqueous solution that boils at 105.0 ∘C? Express your answer using two significant figures.

Answers

The boiling point of standard water is 100 degree Celsius, with the addition of solute the boiling point is elevated. The freezing point of the solution will be -18.04 degree Celsius.

What is boiling point?

The boiling point is the temperature at which the liquid is converted to vapor. The change in boiling point of the aqueous solution gives the molality of the solution as:

\rm \Delta T=ebuliloscopic constant\;*\;molality\;*\;von't\;hoff\;factor\n105^\circ C-100^\circ C=0.512^\circ C.kg/mol\;*\;1\;*\;m\n9.7\;mol/kg=m

The depression in freezing point from molality is given as;

\rm \Delta T=K_f\;*\;molality\;*\;i\n\Delta\;T=1.86\;^\circ C/m\;*\;9.7\;*\;1\n\Delta T=18.04\;^\circ C\n

The freezing point of aqueous water is zero degree Celsius. The freezing point of the solution will be:

\rm \Delta T=0^\circ\;C-New\;freezing\;point\n18.04^\circ\;C=0-New\;freezing\;point\nNew\;freezing\;point=-18.04^\circ C

The freezing point of the solution is -18.04 degree Celsius.

Learn more about boiling point, here:

brainly.com/question/2153588

Answer:

T°fussion of solution is -18°C

Explanation:

We have to involve two colligative properties to solve this. Let's imagine that the solute is non electrolytic, so i = 1

First of all, we apply boiling point elevation

ΔT = Kb . m . i

ΔT = Boiling T° of solution - Boiling T° of pure solvent

Kb =  ebuliloscopic constant

105°C - 100° = 0.512 °C kg/mol  . m . 1

5°C / 0.512 °C mol/kg = m

9.7 mol/kg = m

Now that we have the molality we can apply, the Freezing point depression.

ΔT = Kf . m . i

Kf =  cryoscopic constant

0° - (T°fussion of solution) = 1.86 °C/m  . 9.76 m . 1

- (1.86°C /m . 9.7 m) = T°fussion of solution

- 18°C = T°fussion of solution

In what respect does an atom of magnesium differ from a magnesium ion (Mg^{2+})? a. The ion has a more stable electronic arrangement than the atom.
b. The positive charge on the nucleus of the ion is two units greater than the nuclear charge on the atom.
c. The ion has two more protons than the atom.
d. The ion will react more readily with free Cl₂. (E)The ion has two more planetary electrons than the atom. Can anyone explain this one?

Answers

The correct answer is A.  Atoms and ions only differ in the number of electrons each one has and atoms form ions to achieve a more stable electron configuration.  

I hope this helps.  Let me know if anything is unclear.

What is true about the dilution of a solution?The amount of solute decreases.
The volume remains the same.
The amount of solvent increases.
The concentration increases.

Answers

The amount of solvent increases, since the solvent is the one diluting the solution, the more you want your solution diluted, the more of solvent you'd use. :)

What is a solution for deforestation



(full sentences please)

Answers

The best solution to deforestation is to curb the felling of trees by enforcing a series of rules and laws to govern it. Deforestation in the current scenario may have reduced; however, it would be too early to assume. The money-churner nature of forest resources can be tempting enough for deforestation to continue.

The best solution to deforestation is to curb the felling of trees by enforcing a series of rules and laws to govern it. Deforestation in the current scenario may have reduced; however, it would be too early to assume. The money-churner nature of forest resources can be tempting enough for deforestation to continue.
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