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
aleksley [76]
3 years ago
15

Please help me with questions 43, 44, and 45

Chemistry
1 answer:
ohaa [14]3 years ago
6 0
Im que se puede encontrar un segundo lugar en a las que se puede hacer un trabajo en la it was correct but i said that he would not answer the answer
You might be interested in
If 125g of KClO3 is heated, what is the total mass of the products?​
Andrej [43]

Given parameters:

Mass of KClO₃  = 125g

Unknown:

Total mass of the products = ?

When  KClO₃ is heated, it thermally decomposes to KCl and O₂ according to the chemical equation below;

               2KClO₃  →  2KCl + 3O₂

All chemical equations obeys the law of conservation of matter and with this regard, we know that the amount of reactants used is the same as that of the product.

The total mass of the products must give us 125g according to this law of conservation of matter.

Now to find the masses of each product,

  1. Find the number of moles of the given reactant:

     Number of moles  = \frac{mass}{molar mass}

  molar mass of  KClO₃  = 39 + 35.5 + 3(16)  = 122.5g/mol

    So number of moles of KClO₃ = \frac{125}{122.5}  = 1.02moles

    2. Now, using this number of moles, find the number of moles of the products using this value;

   2 moles of KClO₃ produced 2 moles of KCl

  1.02 moles of KClO₃ will also produce 1.02moles of KCl

   2 moles of KClO₃ produced 3 moles of O₂

   1.02 moles of KClO₃ will produce   \frac{1.02 x 3} {2} mole = 1.53 moles of O₂

   3. Now find the masses of each product;

Mass  = number of moles x molar mass

  molar mass of KCl  = 39 + 35.5 = 74.5g/mol

  molar mass of O₂  = 16 x 2  = 32g/mol

  Mass of KCl  = 74.5 x 1.02  = 75.99g

  Mass of O₂  = 32 x 1.53 = 48.96g

Total mass of products = mass of KCl + Mass of O₂ = 75.99g + 48.96g

                                        = 124.95g

This value is approximately the same as that of mass of  KClO₃

 

7 0
3 years ago
Who
Mariulka [41]
2) generating power by using fossil fuels is harvesting a non-renewable resource. The more you harvest = the less you have
8 0
3 years ago
Help mark brainliest !! Both dehydration and water addition to alkenes use h2so4 as a catalyst.Which is the difference between t
sasho [114]
Can u take a picture of it
7 0
3 years ago
A 16.0 mL sample of a 1.04 M potassium sulfate solution is mixed with 14.3 mL of a 0.880 M barium nitrate solution and this prec
stiks02 [169]
Number of moles in the K2SO4 sample
= (16/1000)*1.04= 0.01664 mol

Number of moles in the Ba(NO3)2 sample
= (14.3/1000*0.880)= 0.01258 mol

Since the reaction is a 1:1 ratio between the two reactants, the limiting reagent is the one containing a smaller number of moles, namely Ba(NO3)2.

The molecular mass of BaSO4 is 137.3+(32.06+4*16.00)=233.4
Therefore the theoretical yield of Barium Sulphate is
233.4*0.01258=2.937 g
Actual yield = 2.60 g (given)
Therefore the percentage yield = 2.60/2.937=88.54%

Answer: 
1. the limiting reagent is Barium Nitrate (Ba(NO3)2)
2. the theoretical yield is 2.94 g
3. the percentage yield is 88.5%

I apologize for the mistake previous to this update.

5 0
3 years ago
What happens when the atoms of a substance are regrouped?
galina1969 [7]
The one that happens when the atoms of a substance are regrouped is : a new substance is formed.
After atoms being regrouped the molecules of the original substance will be different and the substance will have different properties from those of the reactans
5 0
2 years ago
Other questions:
  • Light of a certain energy shines on a metal and causes electrons to be emitted.
    8·2 answers
  • Why aren't alkali metals found in pure form?
    10·1 answer
  • Find the mass in 6.2 miles of lithium bromide, show work
    5·1 answer
  • Another name for light is ________.
    13·1 answer
  • 1) The PPF: Draw a Production Possibilities Frontier (PPF) for the production of two goods, machine tools (a capital good) and d
    13·1 answer
  • What do all volcanos emit?
    15·1 answer
  • What is the enthalpy change from h2o liquid to h2o gas
    14·1 answer
  • If the pH is 9, what is the concentration of hydroxide ion?
    9·1 answer
  • PLEASE HELP ASAP!!!!!
    9·1 answer
  • Hikers noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!