Answer:
When two substances having different temperatures are introduced or kept together, heat energy, Q, flows from a substance at higher temperature to a substance at lower temperature. Also, heat continues to be transferred until their temperatures are equalized, at which point the substances are in thermal equilibrium. In a closed system, the amount of energy lost is equal to but opposite the amount of energy gained.
Explanation:
<span>If there are 38 g of CFC, then there will be 120.9135 g of CFCl2 per mol. You will multiply this times the number of moles of Cl (2) for every mole of CFCl2, and then by the number of grams of Cl per mole, which is 35.4532: (38.0 g CF2Cl2) / (120.9135 g CF2Cl2/mol) x (2 mol Cl / 1 mol CF2Cl2) x (35.4532 g Cl/mol) =
22.3 g Cl in CF2Cl2
Next, if there are 38 g of CFC, there will be 137.3861 g of CFCl3 per mole. You will multiply this times the number of moles of Cl (3 this time) for every mole of CFCl3. You will then multiply this by 35.4532 again:
(38.0 g CFCl3) / (137.3681 g CFCl3/mol) x (3 mol Cl / 1 mol CFCl3) x (35.4532 g Cl/mol) =
29.4 g Cl in CFCl3
Continue following these steps until you are able to multiply 1 mole of Cl per 1 mol CF3Cl by 35.4532:
(38.0 g C2F3Cl3) / (187.3756 g C2F3Cl3/mol) x (3 mol Cl / 1 mol C2F3Cl3) x (35.4532 g Cl/mol) =
21.6 g Cl in C2F3Cl3
(38.0 g CF3Cl) / (104.4589 g CF3Cl/mol) x (1 mol Cl / 1 mol CF3Cl) x (35.4532 g Cl/mol) =
12.9 g Cl in CF3Cl</span>
The reaction is
2Cu + S → Cu2S
So as per balanced given reaction we need one mole of sulphur over two moles of copper
Or
To react with one mole of sulphur we need two moles of copper
Thus we can say that the mole ration required for complete reaction will be
Cu : S = 2 : 1
As per the given problem the moles of each Cu and S are 3 moles
Thus for each three moles of given sulphur we need six moles of Cu to give three moles of Cu2S
However we have only three moles of copper available
So the limiting reagent is copper
It is going to decide the actual yield of reaction
The three moles of Copper will get completely utilized and only 1.5 moles of S will be used in the reaction making S an excess reagent
The moles of S left will be = 1.5 moles
moles of Cu2S formed = 1.5 moles
A low pressure system has lower pressure at its center than the areas around it. Winds blow towards the low pressure, and the air rises in the atmosphere where they meet. As the air rises, the water vapor within it condenses, forming clouds and often precipitation.
<u>Explanation</u>:
- Wind flow towards the low pressure and the air rises in the atmosphere. As the air increases, the water vapor within it solidifies, forming clouds and undergo precipitation. Low pressure formed in the center areas.
- The atmospheric circulations of air up and down in a low-pressure area remove a small amount of atmosphere. This usually happens between warm and cold air masses by flowing air which tries to reduce the contrast of temperature.
Answer:
Because it helps the filament from decaying
