The reaction of sodium peroxide and water produces sodium hydroxide and oxygen gas. The following balanced chemical equation represents the reaction. 2 Na^2O^2(s) + 2 H^2O(l) → 4 NaOH(s) + O2(g)

How many moles of sodium hydroxide are produced when 17.2 mol sodium peroxide reacts with water?


Answer 1


34.4 mol.


  • From the balanced equation:

2 Na₂O₂(s) + 2 H₂O(l) → 4 NaOH(s) + O₂(g),

It is clear that 2 moles of Na₂O₂ react with 2 moles of H₂O to produce 4 moles of NaOH and 1 mole of O₂.

Using cross multiplication:

2 moles of Na₂O₂ produce → 4 mole of NaOH.

17.2 moles of Na₂O₂ produce → ??? mole of NaOH.

∴ The no. of moles of NaOH produced = (4 mole)(17.2 mole)/(2 mole) =  34.4 mol.

Related Questions


Calculate [H3O+] given [OH−] in each aqueous solution. 1. [OH−] = 2.1×10^−11 M
Express your answer using two significant figures.
2. [OH−] = 6.5×10^−9 M
Express your answer using two significant figures.
3. [OH−] = 4.1×10−4 M
Express your answer using two significant figures.
4. [OH−] = 5.5×10−2 M
Express your answer using two significant figures.


1.  [H₃O⁺] = 0.47 ×  10⁻³ M

2. [H₃O⁺] = 0.15 × 10⁻⁵ M

3. [H₃O⁺] = 0.24 ×  10⁻¹⁰ M

4. [H₃O⁺] = 0.18 ×  10⁻¹² M


We know that:

[H₃O⁺] × [OH⁻] = 10⁻¹⁴

[H₃O⁺] = 10⁻¹⁴ / [OH⁻]

1. [H₃O⁺] = 10⁻¹⁴ / (2.1 × 10⁻¹¹)

[H₃O⁺] = 0.47 ×  10⁻³ M

2. [H₃O⁺] = 10⁻¹⁴ / (6.5 × 10⁻⁹)

[H₃O⁺] = 0.15 × 10⁻⁵ M

3. [H₃O⁺] = 10⁻¹⁴ / (4.1 × 10⁻⁴)

[H₃O⁺] = 0.24 ×  10⁻¹⁰ M

4. [H₃O⁺] = 10⁻¹⁴ / (5.5 × 10⁻²)

[H₃O⁺] = 0.18 ×  10⁻¹² M

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Which of the following shows three elements in order of decreasing conductivity? A. Zn,Ag,Pd,
B. Pd,Ag,Zn
C. Ag,Pd,Zn,
D. Zn,Pd,Ag


Answer: Ag, Zn, Pd. (Ag is has the highest conductivity and Pd has the lowest conductivity).


The correct answer is not among the options given.

You must look up the electrical conductivity of these metals in a table of metal properties.

The values that you can find are:

  • Ag: 62.1 × 10⁶ Siemmens / m
  • Zn: 16.6 × 10⁶ Siemmens / m
  • Pd: 9.5 × 10⁶ Siemmens / m

So in order of decreasing conductivity the list is Ag > Zn > Pd.


The decreasing order of the electrical conductivity between elements Zn, AG and Pd is the following order:

Ag (silver), Zn(Zinc), Pd(Lead)

The correct option is not mentioned here.

  • Conductivity of an element means property to pass energy in this material.
  • Some elements have high conductivity than other elements.
  • There are different types of conductivity like electrical conductivity, thermal conductivity etc.
  • Silver has highest conductivity in elements.
  • After that in given list zinc is highly conductive and lead is at third position.


What is required for a chemical reaction to occur?



  • In order to a chemical reaction to occur it is necessary that the reactants collide with enough energy and with the right orientation.


The conditions for a chemical reaction to occur are explained by the collision theory.

The collision must provide enough energy to overcome the energy barrier called activation energy.

If the energy of the collision is less than the activation energy then the bonds of the reactants will not be broken and the reactants will not be transformed into other substances (products).

Also, to brake the  bonds of the reactants and form the new ones of the transition state (intermediate compound known as activated complex), it is needed that the atoms of one molecule hit the right atoms of the other molecule, this is the collision must have the appropriate orientation to yield the products.


Liquid helium boils at –268.93 °C. What is the boiling point of helium on the Kelvin temperature scale?


In order to change celcius to kelvin always add 73 to it leaving you with -195.93



Explanation: When solving for Kelvin you want to add 273 which is the constant to get your answer which should be 4.07K.

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