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
cupoosta [38]
3 years ago
13

Calculate the value of q (kj) in this exothermic reaction when 5.40 g of hydrogen peroxide decomposes at constant pressure?

Chemistry
1 answer:
Gelneren [198K]3 years ago
6 0
Hydrogen peroxide decomposes to yield water and oxygen gas 
That is; H2O2 (l) = H2O (l) + O2(g)
The standard heat of formation; H2O2 (l) = -187.6 kJ/mol; H2O(l) = -285.8 kJ/mol
1 mole of hydrogen peroxide contains 34 g
Thus, 5.4 g contains 5.4/34 = 0.1588 moles 
The moles of water produced will also be equivalent to 0.1588 moles 
Heat = heat of formation of product - reactant
Therefore; Heat = (0.1588 moles × -285,8 )- (0.1588× -187.6)
                           =  -15.594 kJ
You might be interested in
Balancing equations <br><br> H2SO4 +<br> NaOH<br> Na2SO4 +<br> H20
notsponge [240]

Explanation:

<h3>H2SO4 + 2 NaOH = Na2SO4 + 2H20, </h3>

<h3>2 in sodium hydroxide </h3><h3>And 2 in water </h3>
6 0
3 years ago
Multiple Choice Question
valina [46]

Answer:

Explanation:

i would say not d im not fully sure but id say c

6 0
3 years ago
What is any single living thing that can carry out life processes on its own?
ad-work [718]
Any single thing that can carry out life processes on its own is a dolphin.
 <span />
6 0
4 years ago
How did Thomson show that cathode<br> rays are different from light?
Flura [38]

Answer:

They had a negative charge

Explanation:

5 0
3 years ago
Fill in the blanks to complete each statement about weathering
Allushta [10]

Answer:

Explanation:

Weathering is the breakdown of rocks into smaller particles called:

                  sediments

Weathering is the physical disintegration and chemical decay of rocks into smaller fragments to produce sediments. The product of rock weathering is basically sediments. Some of the sediments can be transformed to form soils when they combine with organic matter, water and air.

Physical weathering is when rocks are physically broken into smaller pieces, but the minerals in  the rock remain the same.

              Physical weathering

Physical weathering is the disintegration of rocks into smaller bits without altering the chemical make up of the minerals. The goal of physical weathering is to expose rock surface to action of chemical weathering.

When a rock is broken down in a way that changes the mineral composition, it is called  chemical weathering

           chemical weathering

Chemical weathering is the decay of rocks by altering the minerals in a rock.

4 0
4 years ago
Read 2 more answers
Other questions:
  • Write a balanced, net ionic equation for the precipitation reaction of CaCl₂ and Cs₃PO₄ in an aqueous solution. Remember to incl
    11·1 answer
  • Help asap!! Will mark brainliest
    11·1 answer
  • The unique odors and flavors of many fruits are primarily due to small quantities of a certain class of organic compounds. The e
    8·1 answer
  • An Arrhenius base yields which ion as the only negative ion in an aqueous solution?
    14·1 answer
  • What do you know about a substance it you know its temperature? A.How heavy the substance is B.How large or small the particles
    8·2 answers
  • 5. How many grams are in 0.719 moles of NaOH? ​
    5·1 answer
  • Calculate heat energy
    6·1 answer
  • What are the names of those?
    13·1 answer
  • Select the correct answer from each drop-down menu.
    14·1 answer
  • What is the molarity of a solution made by dissolving .75mol of NaCl in 3.0L of solution?
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!