A 0.9621 g sample, whose mass percent of hydrogen peroxide is 1.17% requires 11.07 mL of 0.0200 M KMnO₄ to react completely.
Let's consider the balanced equation for the reaction between H₂O₂ and KMnO₄.
2 KMnO₄ + 3 H₂O₂ → 3 O₂ + 2 MnO₂ + 2 KOH + 2 H₂O
11.07 mL of 0.0200 M KMnO₄ react. We can calculate the reacting mass of H₂O₂ considering that:
- The molar ratio of KMnO₄ to H₂O₂ is 2:3.
- The molar mass of H₂O₂ is 34.01 g/mol.
0.0113 g of H₂O₂ are in 0.9621 g of the sample. The mass percent of H₂O₂ in the sample is:
A 0.9621 g sample, whose mass percent of hydrogen peroxide is 1.17% requires 11.07 mL of 0.0200 M KMnO₄ to react completely.
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In a liquid, for example water (H2O), the molecules are in constant motion. When water loses energy, its molecular motion decreases. As a result water molecules get pulled closer and experience a stronger force of attraction (cohesive forces). If sufficient energy is lost, the physical state of water can change from liquid to solid. Hence the correct choices are:
the liquid may become a solid particle
the liquid may become a slower moving liquid particle
Answer: the minimum amount of energy required to break bonds and start a chemical reaction
Explanation: got a 100% on the quick check
<span>23.8 g/mol
Since the definition of molar mass is mass per mole, just divide the mass of the sample by the number of moles you have. So
0.250 g / 1.05x10^-2 mol = 23.8095 g/mol
Since our input data only has 3 significant figures, you need to round the result to 3 significant figures.
23.8095 g/mol rounds to 23.8 g/mol</span>
There are 300 light particles in an airtight container. The adjustment that would increase the speed of the particle is keeping the pressure constant and increasing the temperature. Option B is correct.
The speed of a particle is the distance traveled by one molecule of a substance. Particles travel as a result of the kinetic energy they possess.
The kinetic energy attributed to each particle rises as the temperature rises.
As a result, in 300 light particles, the particles will travel more quickly when the temperature is increased while the pressure of the particle remains constant.
Therefore, we can conclude that the adjustment that would increase the speed of the particles is keeping the pressure constant and increasing the temperature.
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