-20.16 KJ of heat are released by the reaction of 25.0 g of Na2O2.
Explanation:
Given:
mass of Na2O2 = 25 grams
atomic mass of Na2O2 = 78 gram/mole
number of mole = ![\frac{mass}{atomic mass of 1 mole}](https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Batomic%20mass%20of%201%20mole%7D)
= ![\frac{25}{78}](https://tex.z-dn.net/?f=%5Cfrac%7B25%7D%7B78%7D)
=0. 32 moles
The balanced equation for the reaction:
2 Na2O2(s) + 2 H2O(l) → 4 NaOH(aq) + O2(g) ∆Hο = −126 kJ
It can be seen that 126 KJ of energy is released when 2 moles of Na2O2 undergoes reaction.
similarly 0.3 moles of Na2O2 on reaction would give:
= ![\frac{x}{0.32}](https://tex.z-dn.net/?f=%5Cfrac%7Bx%7D%7B0.32%7D)
x = ![\frac{126 x 0.32}{2}](https://tex.z-dn.net/?f=%5Cfrac%7B126%20x%200.32%7D%7B2%7D)
= -20.16 KJ
Thus, - 20.16 KJ of energy will be released.
Answer:
Decrease
Explanation:
Since the speed in which the gas molecules are faster as they are heated, they fly around in the container and logically, it is harder to insert a moving object into water than something more stationary or slower.
The number of mole sulphuric acid in each mL of solution is 0.0183 mol/mL.
<h3>What is concentration?</h3>
- Concentration in chemistry is calculated by dividing a constituent's abundance by the mixture's total volume.
- Mass concentration, molar concentration, number concentration, and volume concentration are four different categories of mathematical description.
- Any type of chemical mixture can be referred to by the term "concentration," however solutes and solvents in solutions are most usually mentioned.
- There are different types of molar (quantity) concentration, including normal concentration and osmotic concentration.
<h3>How is concentration determined?</h3>
- Subtract the solute's mass from the total volume of the solution. Using m as the solute's mass and V as the total volume of the solution, write out the equation C = m/V.
- To get the concentration of your solution, divide the mass and volume figures you discovered and plug them in.
Learn more about concentration here:
brainly.com/question/13872928
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Answer:
a chart
Explanation:
a chart a chart is the answer