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Caroline Oliveira

Caroline O.

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Ammonium nitrate, known for its use in agriculture, can be produced from ammonia by the following sequence of reactions: $$ \begin{aligned} \mathrm{NH}_{3}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) & \longrightarrow \mathrm{NO}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \\ \mathrm{NO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) & \longrightarrow \mathrm{NO}_{2}(\mathrm{~g}) \\ \mathrm{NO}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\ell) & \longrightarrow \mathrm{HNO}_{3}(\mathrm{aq})+\mathrm{NO}(\mathrm{g}) \\ \mathrm{HNO}_{3}(\mathrm{aq})+\mathrm{NH}_{3}(\mathrm{~g}) & \longrightarrow \mathrm{NH}_{4} \mathrm{NO}_{3}(\mathrm{aq}) \end{aligned} $$ (a) Balance each equation. (b) How many moles of nitrogen atoms are required for every mole of ammonium nitrate $\left(\mathrm{NH}_{4} \mathrm{NO}_{3}\right) ?$ (c) How much ammonia is needed to prepare 200.0 grams of ammonium nitrate $\left(\mathrm{NH}_{4} \mathrm{NO}_{3}\right)$ ?

Ammonium nitrate, known for its use in agriculture, can be produced from ammonia by the following sequence of reactions: $$ \begin{aligned} \mathrm{NH}_{3}(\mathrm{~g})+\mathrm{O}_{2}(\mathrm{~g}) & \longrightarrow \mathrm{NO}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \\ \mathrm{NO}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{~g}) & \longrightarrow \mathrm{NO}_{2}(\mathrm{~g}) \\ \mathrm{NO}_{2}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\ell) & \longrightarrow \mathrm{HNO}_{3}(\mathrm{aq})+\mathrm{NO}(\mathrm{g}) \\ \mathrm{HNO}_{3}(\mathrm{aq})+\mathrm{NH}_{3}(\mathrm{~g}) & \longrightarrow \mathrm{NH}_{4} \mathrm{NO}_{3}(\mathrm{aq}) \end{aligned} $$ (a) Balance each equation. (b) How many moles of nitrogen atoms are required for every mole of ammonium nitrate $\left(\mathrm{NH}_{4} \mathrm{NO}_{3}\right) ?$ (c) How much ammonia is needed to prepare 200.0 grams of ammonium nitrate $\left(\mathrm{NH}_{4} \mathrm{NO}_{3}\right)$ ?

Chemistry

Convert each equation to standard form by completing the square on $x$ and $y .$ Then graph the ellipse and give $$9 x^{2}+16 y^{2}-18 x+64 y-71=0$$

Convert each equation to standard form by completing the square on $x$ and $y .$ Then graph the ellipse and give $$9 x^{2}+16 y^{2}-18 x+64 y-71=0$$

Precalculus

Conic Sections and Analytic Geometry

The Ellipse

A truck has $2.5$-ft tires (in diameter). a. What distance will the truck travel with one rotation of the wheels? Give the exact distance and an approximation to the nearest tenth of a foot. b. How far will the truck travel with 10,000 rotations of the wheels? Give the exact distance and an approximation to the nearest foot. c. If the wheels turn at $672 \mathrm{rpm}$, what is the angular speed? d. If the wheels turn at $672 \mathrm{rpm}$, what is the linear speed in feet per minute? Give the exact distance and an approximation to the nearest whole unit. e. If the wheels turn at $672 \mathrm{rpm}$, what is the linear speed in miles per hour? Round to the nearest mile per hour. (Hint: $1 \mathrm{mi}=5280 \mathrm{ft}$ and $1 \mathrm{hr}=60 \mathrm{~min}$.)

Precalculus

Trigonometric Functions

Angles and Their Measure

The temperature $T$ (in ${ }^{\circ} \mathrm{F}$ ) for Kansas City, Missouri, over a several day period in April can be approximated by $T(t)=-5.9 \cos (0.262 t-1.245)+48.2$, where $t$ is the number of hours since midnight on day $1 .$ a. What is the period of the function? Round to the nearest hour. b. What is the significance of the term $48.2$ in this model? c. What is the significance of the factor $5.9$ in this model? d. What was the minimum temperature for the day? When did it occur? e. What was the maximum temperature for the day? When did it occur?

Precalculus

Trigonometric Functions

Graphs of Sine and Cosine Functions

Questions asked

ANSWERED

Dominique Jan Tan verified

Numerade educator

An analytical chemist is titrating 125.7mL of a 0.8800M solution of diethylamine C2H52NH with a 0.7700M solution of HClO4. The pKb of diethylamine is 2.89. Calculate the pH of the base solution after the chemist has added 154.2mL of the HClO4 solution to it.

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ANSWERED

David Collins verified

Numerade educator

A chemistry graduate student is studying the rate of this reaction: [ mathrm{H}_{2} mathrm{CO}_{3}(a q) ightarrow mathrm{H}_{2} mathrm{O}(a q)+mathrm{CO}_{2}(a q) ] He fills a reaction vessel with ( mathrm{H}_{2} mathrm{CO}_{3} ) and measures its concentration as the reaction proceeds: egin{tabular}{|r|r|} hline ( egin{array}{c} ext { time } \ ext { (minutes) }end{array} ) & {( left[mathrm{H}_{2} mathrm{CO}_{3} ight] )} \ hline 0 & ( 0.0600 M ) \ hline 10. & ( 0.0167 M ) \ hline 20. & ( 0.00972 M ) \ hline 30. & ( 0.00685 M ) \ hline 40. & ( 0.00529 M ) \ hline end{tabular} Use this data to answer the following questions. egin{tabular}{|l|l|} hline ( egin{array}{l} ext { Write the rate law for this } \ ext { reaction. }end{array} ) & rate ( =k square ) \ hline ( egin{array}{l} ext { Calculate the value of the rate } \ ext { constant } k .end{array} ) & ( k=square ) \ ( egin{array}{l} ext { Round your answer to } 2 \ ext { significant digits. Also be sure } \ ext { your answer has the correct unit } \ ext { symbol. }end{array} ) & \ hline end{tabular}

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ANSWERED

Oluwapelumi Kolawole verified

Numerade educator

A chemistry graduate student is studying the rate of this reaction: 2N2O5(g) ? 2N2O4(g) + O2(g) She fills a reaction vessel with N2O5 and measures its concentration as the reaction proceeds: time (seconds) | [N2O5] 0 | 0.100 M 10. | 0.0588 M 20. | 0.0346 M 30. | 0.0203 M 40. | 0.0119 M Use this data to answer the following questions. Write the rate law for this reaction. | rate = k Calculate the value of the rate constant k. Round your answer to 2 significant digits. Also be sure your answer has the correct unit symbol. | k =

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INSTANT ANSWER

- STATES OF MATTER Drawing a heating curve Substance \( X \) is known to exist at 1 atm in the solid, liquid, or vapor phase, depending on the temperature. Additionally, the values of these other properties of \( X \) have been determined: \begin{tabular}{|c|c|} \hline melting point & \( 45 .{ }^{\circ} \mathrm{C} \) \\ \hline enthalpy of fusion & \( 6.00 \mathrm{~kJ} / \mathrm{mol} \) \\ \hline density & \( \begin{array}{c}1.50 \mathrm{~g} / \mathrm{cm}^{3} \text { (solid) } \\ 1.30 \mathrm{~g} / \mathrm{mL} \text { (liquid) }\end{array} \) \\ \hline \end{tabular} \begin{tabular}{|c|c|} \hline boiling point & \( 80 .{ }^{\circ} \mathrm{C} \) \\ \hline \( \begin{array}{c}\text { enthalpy of } \\ \text { vaporization }\end{array} \) & \( 40.00 \mathrm{~kJ} / \mathrm{mol} \) \\ \hline & \( 34 . \mathrm{J} \cdot \mathrm{K}^{-1} \cdot \mathrm{mol}^{-1} \) (solid) \\ heat capacity & \( \begin{array}{l}49 . \mathrm{J} \cdot \mathrm{K}^{-1} \cdot \mathrm{mol}^{-1} \text { (liquid) } \\ 44 . \mathrm{J} \cdot \mathrm{K}^{-1} \cdot \mathrm{mol}^{-1} \text { (vapor) }\end{array} \) \\ \hline \end{tabular} You may also assume \( X \) behaves as an ideal gas in the vapor phase. Suppose a small sample of \( X \) at \( 20{ }^{\circ} \mathrm{C} \) is put into an evacuated flask and heated at a constant rate until \( 20.0 \mathrm{~kJ} / \mathrm{mol} \) of heat has been added to the sample. Graph the temperature of the sample that would be observed during this experiment.

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ANSWERED

Ronald Prasad verified

Numerade educator

What kind of intermolecular forces act between a water molecule and a chloride anion?

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AWAITING AN EDUCATOR

Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on.

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ANSWERED

David Collins verified

Numerade educator

Use the information in the ALEKS Data tab to sort the following chemical species by reducing power. species reducing power Ni Ca Zn Na

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INSTANT ANSWER

of an unknown protein are dissolved in enough solvent to make 5.00mL of solution. The osmotic pressure of this solution is measured to be 0.157atm at 25.0°C.

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ANSWER IN PROGRESS

A certain liquid X has a normal boiling point of 110.20°C and a boiling point elevation constant =Kb0.86·°C·kgmol−1. Calculate the boiling point of a solution made of 146.g of zinc chloride (ZnCl2) dissolved in 650.g of X.

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ANSWERED

Jennifer Hudspeth verified

Numerade educator

A chemist prepares a solution of aluminum chloride AlCl3 by weighing out 11.6g of aluminum chloride into a 200.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in /gdL of the chemist's aluminum chloride solution. Round your answer to 3 significant digits.

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