1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ahat [919]
2 years ago
5

Aspirin (C9H8O4, molecular mass 180.2 g/mol) is synthesized by the reaction of salicylic acid (C7H6O3, molecular mass 138.1 g/mo

l) with acetic anhydride (C4H6O3, molecular mass 102.1 g/mol) according to the reaction 2 C7H6O3 (s) + C4H6O3(l) → 2C9H8O4(s)+ H2O(l) 2.0g of salicylic acid and 5.4 g of acetic anhydride are mixed and the reaction is allowed to go to completion. Do each of the following: A. Identify the limiting reagent. B. State how many grams of the excess reagent remain. C. State how many grams of product are produced.
Chemistry
1 answer:
Whitepunk [10]2 years ago
6 0

Answer:

A. The Salicylic acid C_{7}H_{6}O_{3} is the limiting reagent.

B. 4.66 g of the acetic anhydride C_{4}H_{6}O_{3} remain.

C. 2.6 g of C_{9}H_{8}O_{4} are produced.

Explanation:

A. First write the balanced chemical equation fior the asprin synthesis:

_{2}C_{7}H_{6}O_{3}_{(s)}+C_{4}H_{6}O_{3}_{(l)}=_{2}_{(s)}+H_{2}O_{(l)}

Then determine the limiting reagent.

To determine the limiting reagent first divide the mass of each compound between its molar mass, then divide this quantity by the number of moles given by the reaction and the smallest number will be the limiting reagent.

- For the Salicylic acid C_{7}H_{6}O_{3}:

2.0g*\frac{1mol}{138.1g}=0.014

\frac{0.014}{2}=0.007

- For the Acetic anhydride C_{4}H_{6}O_{3}:

5.4g*\frac{1mol}{102.1g}=0.053

\frac{0.052}{1}=0.053

The smallest number is for the salicylic acid therefore it is the limiting reagent.

B. Calculate how many grams of the excess reagent remain.

- First calculate how many grams of acetic anhydride reacts:

2.0gC_{7}H_{6}O_{3}*\frac{1molC_{7}H_{6}O_{3}}{138.1gC_{7}H_{6}O_{3}}*\frac{1molC_{7}H_{6}O_{3}}{2molesC_{7}H_{6}O_{3}}*\frac{102.1gC_{4}H_{6}O_{3}}{1molC_{4}H_{6}O_{3}}=0.74gC_{4}H_{6}O_{3} reacts

- Then subtract the quantity of acetic anhydride that reacts from the quantity that are mixed:

5.4gC_{4}H_{6}O_{3}-0.74gC_{4}H_{6}O_{3}=4.66gC_{4}H_{6}O_{3} remain

C. Calculate how many grams of product are produced:

2.0gC_{7}H_{6}O_{3}*\frac{1molC_{7}H_{6}O_{3}}{138.1gC_{7}H_{6}O_{3}}*\frac{2molesC_{9}H_{8}O_{4}}{2molesC_{7}H_{6}O_{3}}*\frac{180.2gC_{9}H_{8}O_{4}}{1molC_{9}H_{8}O_{4}}=2.6gC_{9}H_{8}O_{4} are produced.

You might be interested in
2.1 g of a hydrocarbon fuel is burned in a calorimeter that contains 280 grams of water initially at 25.00◦C. After the combusti
olga2289 [7]

Answer:

\large \boxed{\text{933 J}}

Explanation:

There are three heat transfers involved.

heat from combustion of propane + heat gained by water + heat gained by calorimeter = 0

  q₁     +     q₂      +       q₃      = 0

m₁ΔH + m₂C₂ΔT + C_calΔT = 0

Data:

 m₁ =      2.1   g

 m₂ = 280     g

   Ti = 25.00 °C

   T_f = 26.55 °C

Ccal = 92.3 J·°C⁻¹

Calculations:

Let's calculate the heats separately.

1. q₁

q₁ = 2.1 g × ΔH = 2.1ΔH g

2. q₂

ΔT = T_f - Ti = 26.55 °C - 25.00 °C = 1.55 °C

q₂ = 280 g × 4.184 J·°C⁻¹ × 1.55 °C = 1816 J

3. q₃

q₃ = 92.3 J·°C⁻¹ × 1.55 °C = 143.1 J

4. ΔH

\begin{array}{rcl}\text{2.1$\Delta$H g +1816 J +143.1 J} & = & 0\\\text{2.1$\Delta$H g +1959 J} & = & 0\\\text{2.1$\Delta$H g}& = & \text{-1959 J}\\\Delta H & = & \dfrac{\text{-1959 J}}{\text{2.1 g}}\\\\& = & \textbf{-933 J/g}\\\end{array}\\\text{The combustion releases $\large \boxed{\textbf{933 J}}$ per gram of fuel burned.}

7 0
3 years ago
Which chemical is a reactant in the reaction shown?<br> A. HCI<br> B. CO₂<br> C. H₂O<br> D. NaCI
zzz [600]
More detail please :)
3 0
3 years ago
Read 2 more answers
What is a scientific question?
Lunna [17]

Answer:

im guessing it's the second one

5 0
3 years ago
A cool, yellow-orange flame is used to heat the crucible. Would this affect the mass of the crucible? If so, how?
s2008m [1.1K]

Answer:

yes

Explanation:

Usually, it would not affect the crucible, but depending on the temperature of the flame the enamel of the crucible may begin to melt and stick to the metal object being used to handle the crucible. This tiny amount that is melted off can cause very small changes in the original mass of the crucible, which although it is almost unnoticeable it is still there. Therefore, the answer to this question would be yes.

5 0
3 years ago
On a graph , which type of line shows a direct proportion?
svetoff [14.1K]
C - straight line
.....................................................................................
5 0
2 years ago
Read 2 more answers
Other questions:
  • What would happen to a volleyball left outside in the winter?
    6·2 answers
  • The water-gas shift reaction describes the reaction of carbon monoxide and water vapor to form carbon dioxide and hydrogen (the
    9·1 answer
  • I need help with the question they are asking
    15·1 answer
  • Describe how an acidic solution forms when HCI is mixed in water
    8·1 answer
  • Earth is in a habitable zone that allows our planet to have liquid water. What is this zone called?
    5·2 answers
  • Why does a laser light not produce a spectrum?
    6·1 answer
  • Which statement about these layers is accurate?
    10·1 answer
  • How many grams of salt are in 5 L of a solution with a concentration of 3 g/L
    8·1 answer
  • Aqueous hydrobromic acid will react with solid sodium hydroxide to produce aqueous sodium bromide and liquid water. Suppose 66.
    11·1 answer
  • The hydrogen and oxygen atoms in a molecule of water are held together by
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!