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
ANEK [815]
3 years ago
13

Calcium carbide can be made by heating calcium oxide with carbon. How many kj of heat are absorbed in the reaction?

Chemistry
1 answer:
QveST [7]3 years ago
6 0

Answer:

179Kj/mol

Explanation:

The equation for the reaction is:

CaO + 3C     ⇒   CaC₂ + CO ₂

The formula for calculating the heat absorbed is:

      ∆Hf (Products) - ∆Hf (Reactants)

Using the heat of formation (∆Hf) for each component in the reaction

∆Hf Cao = -635kj/mol

∆Hf C = 0kj/mol

∆Hf CaC2 = -63kj/mol

∆Hf CO2 = -393.5

The heat absorbed = ( -63 + -393.5) – (-635)

                                  = -  456 + 635

                                  = 179kj/mol

You might be interested in
How many moles of the product fecl3 do you make, when 8moles of fe react with excess cl2
tatuchka [14]

To figure out questions related to reacting moles/masses, the first step is always to write a complete balanced equation.

2Fe (s) + 3Cl2 (g) → 2FeCl3 (s)

Since Cl2 is the excess reactant, and Fe is the limiting reactant, we can simply find the number of moles of the product by comparing the mole ratio of the limiting reactant to the mole ratio of the product from the equation.

From the equation, mole ratio of Fe:FeCl3 = 2:2 = 1:1, the number of moles of product is exactly the same as the number of moles of the limiting reactant, which makes it 8 moles.

Note that if the mole ratio is not 1:1, you have to do some calculations to make sure the no. of moles is balanced at the end. Which means, if the mole ratio happened to be 1:2, the no. of moles of the product would be 8x2=16 instead.

So, your answer is 8 moles.

7 0
3 years ago
Read 2 more answers
Gasoline has a density of 0.749 g/ml. how many pounds does 19.2 gallons of gasoline weigh?
Svetradugi [14.3K]
A good first step is writing the amount in terms of ml. 

19.2 gallons = 72.68 L = 72680 ml

that would mean it weighs 0.749*720680g = 54437.32ml = 54.437 L

hope that helps :)
6 0
3 years ago
Read 2 more answers
Why does a solid have a definite shape and volume?
erica [24]

Answer:

B

Explanation:

The particles are bound to each other and they vibrate at an almost undetectable rate.

8 0
3 years ago
Which statement describes the bonds in iron sulfate, FeSO4?
Feliz [49]

___

Regarding the bonds in FesO₄, Fe and S have an ionic bond, while S and O have covalent bonds.

Elements form bonds to increase their stability. The main types of bonds are:

  • Metallic bonds: they are formed between metals and the electrons are in a delocalized cloud.
  • Ionic bonds: they are formed between metals (lose electrons) and nonmetals (gain electrons)
  • Covalent bonds: they are formed between nonmetals, which share electrons.

Regarding the bonds in FesO₄:

  • Fe is a metal and S a nonmetal, thus they will form ionic bonds.
  • S and O are both nonmetals, thus they will form covalent bonds.

Regarding the bonds in FesO₄, Fe and S have an ionic bond, while S and O have covalent bonds.

Learn more: brainly.com/question/23882847

5 0
2 years ago
Which resource produces the cleanest energy?<br><br> coal<br> gasoline<br> oil<br> wind
stealth61 [152]

Answer:

wind

Explanation:

wind is a natural and renewable resource

4 0
3 years ago
Read 2 more answers
Other questions:
  • What occurs during mitosis? Choose the correct answer.
    14·2 answers
  • The same or similar results in successive measurements is a feature of which measure
    12·1 answer
  • Where are angora goats found​
    15·2 answers
  • Which is the main reason cells are replaced in the body?
    11·1 answer
  • In the following neutralization reaction, which substance is the acid?
    5·1 answer
  • I have to re ask this but pls help me I don't have a lot of time
    15·2 answers
  • The density of an object is 7 g/mL and has a volume of 2mL, what is the mass of the object?
    12·1 answer
  • Can someone please help me answer that question
    13·1 answer
  • Which taxonomic level includes the broadest characteristics?
    13·1 answer
  • Ecologists use food web diagrams, like the one shown, as tools in their studies of different populations of organisms within an
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!