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
Margarita [4]
2 years ago
7

!DUE SOON PLEASE HELP!

Chemistry
1 answer:
nalin [4]2 years ago
6 0

Answer:

balanced;

unbalanced;

unbalanced;

balanced;

Explanation:

CaO + 3C → CaC2 + CO  //all elements are balanced

Na + H2O → 2NaOH + H2  //Na is not balanced on the left

4Fe + O2 → 2Fe2O3  //O is not balanced on the left

2Mg + O2 → 2MgO //left is equal to right, balanced

You might be interested in
How many electrons are present in 4He2+?
Charra [1.4K]
4 and 2 electrons are present.
4 0
3 years ago
has a standard free‑energy change of − 3.59 kJ / mol at 25 °C. What are the concentrations of A , B , and C at equilibrium if, a
Mamont248 [21]

Answer: The concentrations of A , B , and C at equilibrium are 0.1583 M, 0.2583 M, and 0.1417 M.

Explanation:

The reaction equation is as follows.

               A + B \rightarrow C

Initial :     0.3   0.4          0

Change:  -x       -x           x

Equilbm: (0.3 - x)  (0.4 - x)  x  

We know that, relation between standard free energy and equilibrium constant is as follows.

      \Delta G = -RT ln K

Putting the given values into the above formula as follows.

      \Delta G = -RT ln K

      -3.59 kJ/mol = -8.314 \times 10^{-3} kJ/mol K ln (\frac{x}{(0.3 - x)(0.4 - x)})

                x = 0.1417

Hence, at equilibrium

  •  [A] = 0.3 - 0.1417

       = 0.1583 M

  •  [B] = 0.4 - 0.1417

       = 0.2583 M

  •  [C] = 0.1417 M
5 0
2 years ago
What is the mass of 25 Liters of nitrogen dioxide gas?
ValentinkaMS [17]

Answer:

cacfat lebron

Explanation:

mruno bars is the wae

eat my co-ck

coileach

coileach

coileach

coileach

coileach

coileach

coileach

coileach

coileach

coileach

coileach

7 0
3 years ago
0.250 moles of NaCl is dissolved in 0.850 L of solution. What is the molar concentration?
Nuetrik [128]

Considering the definition of molarity, the molar concentration is 0.294 \frac{moles}{liter}.

Molarity reflects the concentration of a solution indicating the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of the solute by the volume of the solution:

molarity=\frac{amount of moles of solute}{volume}

Molarity is expressed in units \frac{moles}{liter}.

In this case, you know:

  • amount of moles of solute= 0.250 moles
  • volume= 0.850 L

Replacing in the definition of molarity:

molarity=\frac{0.250 moles}{0.850 L}

Solving:

molarity= 0.294 \frac{moles}{liter}

Finally, the molar concentration is 0.294 \frac{moles}{liter}.

Learn more about molarity with this example: brainly.com/question/15406534?referrer=searchResults

6 0
2 years ago
One of the reasons that stars are so large is because _____.
ValentinkaMS [17]

Answer:

They are composed of hydrogen and helium

4 0
3 years ago
Read 2 more answers
Other questions:
  • Is a strong acid<br> a. NaC₂H₃O₂ <br> b. HC₂H₃O₂<br> c. KCl <br> d. NH₃<br> e. HCl
    9·1 answer
  • generally speaking electrons are found in shells which we also call principal energy levels located at increasing distances from
    15·1 answer
  • A carbohydrate with an aldehyde functional group is called:
    7·1 answer
  • A sample of water in a sealed flask at 298 k is in equilibrium with its vapor. this is an example of
    6·1 answer
  • What is water? pls tell fast
    8·2 answers
  • What is the best way to determine if an aqueous solution of sodium nitrate is unsaturated
    6·1 answer
  • Why do some metals lose their shine over time but not gold ?
    9·2 answers
  • What are the main reasons that organic chemistry is a primarily target for "green chemistry"? I. Organic solvents are often flam
    7·1 answer
  • What is the pressure of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheri pressure is 767 m
    8·1 answer
  • What substitute for fossil fuel depletion has been heralded as the solution to the nation’s energy problems??
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!