Answer:
Refluxing allows thermally unstable reactants to react faster without decomposition.
Explanation:
Reflux is an experimental laboratory technique, used to produce heating reactions that take place at temperatures higher than room temperature and where it is better to maintain a constant volume in the reaction. By means of this mechanism, it is possible to avoid losing solvent in the course of the process, and therefore, without releasing it into the atmosphere. This is used to heat mixtures for a long time at a certain temperature. As the temperature increases, the reactant particles collide more times and, because they have more energy, there are more particles that exceed the activation energy, which leads to more effective collisions and a higher reaction speed.
Answer:
18.52g
Explanation:
(relative atomic masses: H = 1.01, O = 16.00, Ca = 40.08)
Equation (balanced):
Ca + 2H2O -> Ca(OH)2 +H2
First, calculate the number of moles of 10g calcium
No. of moles of Ca = 10/40.08 = 0.25 mol
Then, calculate the number of moles of 20g water
No of moles of H2O = 1.11 mol
According to the balanced equation, 1 mole of calcium reacts with 2 moles of H2O completely. Therefore, H2O is in excess.
So, 1 mole of calcium reacts with water to form 1 mole of Ca(OH)2 (according to the mole ratio shown in the balanced equation)
Therefore, 0.25 mol of Ca(OH)2 is produced.
Mass of Ca(OH)2 produced = no. of moles x molar mass = 0.25 x (40.08 + 16 + 16 + 1.01 + 1.01) = 18.52g
Good luck!
All chemical equations show that the total mass of the reaction stays the same.
The mass of carbon dioxide that is produced will be 31,671 grams or 31.671 kg
<h3>Stoichiometric calculations</h3>
First, the equation of the reaction:
The mole ratio of propane burned to carbon dioxide produced is 1:3.
The density of propane gas is 0.621 g/mL, thus, 17.0 L of propane will weigh:
Density = mass/volume, mass = 0.621 g/mL x 17000 = 10,557 g
Mole of 10,557 g of propane = 10557/44.1 = 239.39 moles
Equivalent mole of carbon dioxide produced = 239.39 x 3 = 718.16 moles
Mass of 718.16 moles carbon dioxide = 718.16 x 44.1 = 31,671 grams or 31.671 kg
More on stoichiometric calculations can be found here: brainly.com/question/13384700
#SPJ1