Why is PCL3 called phosphorus chloride
1 answer:
You might be interested in
Taking into account the reaction stoichiometry and ideal gas law, 0.48144 grams of KClO₃ was decomposed.
<h3>Reaction stoichiometry</h3>In first place, the balanced reaction is:
2 KClO₃ → 2 KCl + 3 O₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
- KClO₃: 2 moles
- KCl: 2 moles
- O₂: 3 moles
The molar mass of the compounds is:
- KClO₃: 122.45 g/mole
- KCl: 74.45 g/mole
- O₂: 32 g/mole
Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
- KClO₃: 2 moles ×122.45 g/mole= 244.8 grams
- KCl: 2 moles ×74.45 g/mole= 148.9 grams
- O₂: 3 moles ×32 g/mole= 96 grams
The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:
P×V = n×R×T
where:
- P is the gas pressure.
- V is the volume that the gas occupies.
- T is the temperature of the gas.
- R is the ideal gas constant. The universal constant of ideal gases R has the same value for all gaseous substances.
- n is the number of moles of the gas.
165 mL of oxygen is produced at 30.0 °C and 90.0 kPa. This is, you know:
- P= 90 kPa= 0.888231 atm (being 101.325 kPa= 1 atm)
- V= 165 mL= 0.165 L (being 1000 mL= 1 L)
- n= ?
- R= 0.082
- T= 30 C= 303 K (being 0 C= 273 K)
Replacing in the ideal gas law:
0.888231 atm× 0.165 L = n× 0.082 × 303 K
Solving:
n= (0.888231 atm× 0.165 L)÷ (0.082 × 303 K)
<u><em>n= 0.0059 moles</em></u>
Finally, 0.0059 moles of oxygen is produced at 30 °C and 90 kPa.
<h3>Mass of KClO₃ required</h3>The following rule of three can be applied: If by stoichiometry of the reaction 3 moles of O₂ are produced by 244.8 grams of KClO₃, 0.0059 moles of O₂ are produced by how much mass of KClO₃?
<u><em>mass of KClO₃= 0.48144 grams</em></u>
Finally, 0.48144 grams of KClO₃ was decomposed.
Learn more about
the reaction stoichiometry:
<u>brainly.com/question/24741074</u>
<u>brainly.com/question/24653699</u>
ideal gas law:
The thermometer must be <u>in contact with the ice/water only</u>
Explanation:
In this experiment in the lab, the aim is to measure the specific latent heat of fusion of water.
The specific latent heat of fusion of a substance is the amount of heat energy required to completely melt a certain amount of the substance, mathematically:
where
Q is the heat supplied to the substance
m is the mass of the substance
In this experiment, the aim is to measure the specific latent heat of fusion of water. In order to do that, a mix of ice/water is heated with a certain amount of heat Q, and then it is evaluated the amount of mass m that undergoes melting.
An important precaution that must be taken in this experiment is that the temperature of the water/ice mixture remains constant and equal to the melting point of ice (otherwise, part of the heat supplied to the mixture is used to increase the temperature of the water, resulting in an inaccurate measure of Q). Therefore, a thermometer must be used to check constantly the temperature, and this thermometer must be placed inside the ice/water mixture only (It should not touch the saucepan, whose temperature can be higher).
So, the correct answer is
in contact with the ice/water only
Learn more about specific heat:
#LearnwithBrainly