CHEMISTRY HIGH SCHOOL

Calculate the number of oxygen atoms in 2.00 moles of Mn2O7

Answers

Answer 1
Answer: first you should know that there is seven oxygen atoms in one Mn2O7
So 
2.00 moles of Mn2O7 contain 14.00 moles of oxygen...
Then you multiply this no. with Avagadro no....
from formula
Number of moles= no. of particles/avagadro's no..
14.00×6.02×10²³=84.28 atoms of oxygen... 

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What subatomic particle(s) is/are located in the nucleus of the atom? Protons only

Electrons only

Protons and neutrons

Protons and electrons

Answers

Protons and neutrons!

Balance the following oxidation-reduction reaction: Fe(s)+Na+(aq)→Fe2+(aq)+Na(s) Express the coefficients as integers separated by commas (e.g., 4,1,3,2, where 1 indicates the absence of a coefficient).

Answers

Answer:

The answer to your question is: 1, 2, 1, 2

Explanation:

                       1 Fe(s)  + 2 Na⁺(aq)  → 1 Fe²⁺(aq)  + 2 Na(s)

                             Fe⁰   -   2e⁻       ⇒           Fe⁺²        Oxidases

                             Na⁺   +  1 e⁻       ⇒           Na⁰         Reduces

                      1 x ( 1 Fe⁰      ⇒         1 Fe⁺²)      Interchange number of

                      2 x ( 2Na⁺       ⇒       2 Na⁰ )      electrons

Final answer:

To balance the oxidation-reduction reaction Fe(s) + Na+(aq) → Fe2+(aq) + Na(s), follow these steps: balance atoms other than hydrogen and oxygen, balance hydrogen atoms, balance oxygen atoms, verify charges

Explanation:

To balance the oxidation-reduction reaction Fe(s) + Na+(aq) → Fe2+(aq) + Na(s), we need to balance the number of atoms for each element and the total charge on both sides of the reaction. Here's the step-by-step process:

  1. First, balance the atoms other than hydrogen and oxygen. There is only one atom of Fe on each side, so this is already balanced.
  2. Next, balance the hydrogen atoms. We have no hydrogen on the left side and one hydrogen on the right side, so we need to add a coefficient of 2 in front of Na(s): 2Na(s).
  3. Now, balance the oxygen atoms. We have no oxygen on the left side and one oxygen in Fe2+(aq), so we need to add a coefficient of 2 in front of Fe2+(aq): 2Fe2+(aq).
  4. Finally, verify that the charges are balanced. The charge on the left side is 1+ (from Na+) and the charge on the right side is 0 (from Na). To balance the charges, we need to add a coefficient of 2 in front of Na+: 2Na+(aq).

So, the balanced oxidation-reduction reaction is: Fe(s) + 2Na+(aq) → 2Fe2+(aq) + Na(s).

Learn more about Balancing oxidation-reduction reactions here:

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Which solution has the same boiling point as 0.25 mol CaCl2 dissolved in 1000 g water?Help Please, Thanks!

0.75 mol sucrose dissolved in 1000 g water
1.0 mol ethylene glycol dissolved in 1000 g water
0.50 mol CaCl2 dissolved in 1000 g water
0.25 mol NaCl dissolved in 1000 g water

Answers

The boiling point of water at 1 atm is 100 degrees celsius. However, when water is added with another substance the boiling point of it rises than when it is still a pure solvent. This called boiling point elevation, a colligative property. The equation for the boiling point elevation is expressed as the product of the ebullioscopic constant (0.52 degrees celsius / m) for water), the vant hoff factor and the concentration of solute (in terms of molality). 

 ΔT(CaCl2) = i x K x m = 3 x 0.52 x 0.25 = 0.39 °C
 ΔT(Sucrose) = 1 x 0.52 x 0.75 = 0.39 °C
 ΔT(Ethylene glycol) = 1 x 0.52 x 1 = 0.52 °C
 ΔT(CaCl2) = 3 x 0.52 x 0.50 = 0.78 °C
 ΔT(NaCl) = 2 x 0.52 x 0.25 = 0.26 °C

Thus, from the calculated values, we see that 0.75 mol sucrose dissolved on 1 kg water has the same boiling point with 0.25 mol CaCl2 dissolved in 1 kg water.

A balloon is a sphere with a radius of 5.0 m. The force of air against the walls of the balloon is 45 N. What is the air pressure inside the balloon? (surface area = 12.56 x radius^2; 1 Pa = 1 N/m^2)A. 1.4 x 10^3 Pa

B. 3.6 x 10^2 Pa

C. 1.4 x 10^-1 Pa

D. 3.6 x 10^-2 Pa

***Idk how to solve this... pls explain?? thx :)

Answers

Pressure is the force exerted on an object per unit area. The equation is expressed as:

P = F / A

From the given above, we substitute the values to the equation.

P = F/A
P= F / (12.56r²)
P = 45 N / (12.56 x 5²
P = 0.143 N/m²

Therefore, the correct answer is option C, 1.4 x 10^-1 Pa.

Which of the following best expresses the definition of an open system? (2 points)Answer

Energy can enter or leave the system but matter cannot.

Heat and matter are both able to enter or leave the system.

Matter can enter or leave the system but energy cannot.

Heat and matter can enter the system but cannot leave the system.

Answers

The correct answer is the second option. An open system is a system where both matter and heat are able to enter and leave the system. Simply, a system that is very prone to changes. The opposite is called a closed system.

Answer: Option (b) is the correct answer.

Explanation:

An open system is defined as the one where there will occur exchanges of matter as well as heat energy between the system and surrounding.

For example, when a boil water then its heat energy will move into the surrounding and also matter is moving to the surrounding in the form of water vapor or steam.

On the other hand, a system in which there will occur no exchange of matter but exchange of heat will occur from the system to the surrounding is known as a closed system.

For example, coffee placed in a cup covered with lid is a closed system.

Thus, we can conclude that the statement heat and matter are both able to enter or leave the system best expresses the definition of an open system.

Half equation reaction for 2KI+Cl2-I2+2KCl

Answers

Answer:

Explanation:

2kc
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