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
OlgaM077 [116]
3 years ago
12

A 4.98g sample of aniline (C6H5NH2, molar mass is 93.13g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25kJ

/°C. If the temperature rose from 29.5°C to 69.8°C, determine the value of delta H°comb for aniline
Chemistry
1 answer:
natima [27]3 years ago
3 0

 the value  of  delta H°  for aniline = -3201. 5   Kj/mol


<u><em> calculation</em></u>

 Step 1: find heat

Q ( heat)  =  C  ( specific heat capacity)  x ΔT  ( change in temperature)

  C= 4.25 kj/c°

 ΔT = 69.8-29.5  = 40.3 c°

 Q= 4.25 kj/c    x  40.3 c = 171.28 kj

Step 2:  find the moles of aniline

  moles  = mass/ molar  mass

 = 4.98 g/ 93.13 g/mol =0.0535  moles

Step 3 :  find delta H

 171.28 kj   / 0.0535=3201.5 kj/mol


since the reaction is  exothermic  delta  H = -3201.5 Kj/mol

 


You might be interested in
A plane takes 230 passengers from New York to Chicago in 3 hours.
devlian [24]

Answer:263mph

Explanation:

3 0
2 years ago
How many molecules would be in 2.5 moles of H2O.show work
Fantom [35]

Answer:

1.5x 10^24

Explanation:

for every 1 mol there are 6.02 x 10^23 molecules

2.5 mol x 6.02 x 10^23

-----------------

1 mol

5 0
3 years ago
Which of the following describes the correct order for using the scientific
larisa [96]
A. is the answer
if u have any doubts ask me
please mark as brainliest
8 0
3 years ago
Read 2 more answers
Niven wants to calculate the mass of mgo that is produced by burning of 28.0g of mg. What is the first step in nivens calculatio
babymother [125]

Answer: -

The experiment Niven is doing is burning of Mg.

The first step would be finding the molar mass of MgO

Atomic mass of Mg = 24 g

Atomic mass of Oxygen = 16 g

Molar mass of MgO = 24 x 1 + 16 x 1 = 40 g

The balanced chemical equation for this reaction is

2 Mg + O2 -- > 2MgO

From the balanced equation we see that

2 Mg gives 2 MgO

2 x24 g of Mg O gives 2 x 40 g of MgO.

28g of MgO gives \frac{2 x 40 gram x 28 gram }{2 x 24 gram}

= 46.66 g of MgO.

8 0
3 years ago
Read 2 more answers
If the two atoms participating in a bond have an electron negativity difference of 1.9 , what type of of bond would they be part
brilliants [131]

Answer:

Polar covalent bond.

Explanation:

When the bond is formed between the atoms by sharing the electrons the bond thus have covalent character.   The atom with larger electronegativity attract the electron pair more towards it self and becomes partial negative while the other atom becomes partial positive.  When the electronegativity difference is less than 0.4 the bond is non polar covalent.

When bonded atoms have greater electronegativity difference i.e 2 or greater than two the bond is ionic because electron is transfer from low electronegative atom to highest electronegative atom.

For example:

In water the electronegativity of oxygen is 3.44 and hydrogen is 2.2. That's why electron pair attracted more towards oxygen, thus oxygen becomes partial negative and hydrogen becomes partial positive.

In case of H₂, Cl₂, Br₂ the bond has very high covalent character because of zero electronegativity difference.

7 0
3 years ago
Other questions:
  • Maple syrup, which comes from the sap of maple trees, contains water and natural sugars. It's a clear, brown liquid and the suga
    10·1 answer
  • The density of copper is 8.92 g/cm3. What is the volume in L of a 230.14 mg sample of copper?
    10·1 answer
  • How does a large body of water, such as the ocean, influence climate?
    14·2 answers
  • which atomic particle determines the chemical behavior of an atom the nucleus, neutron, electron, proton or none of these
    9·1 answer
  • The train traveled 100 miles in 4 hours how fast was the train traveling
    10·2 answers
  • Which example is a body fossil?
    11·1 answer
  • helppppp. which of the following statements regarding physical and chemical changes is true? a. both physical and chemical chang
    7·2 answers
  • What is the concentration of a Kl solution of 20.68 g of solute was dissolved in enough water to form 100. ml of solution?
    8·1 answer
  • Cellulose and starch are examples of:
    6·2 answers
  • In addition to DNA, what else is
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!