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TEA [102]
3 years ago
15

There are two beakers that contain the same liquid substance at the same temperature. The larger beaker is 1,000ml and the small

er beaker is 100ml. How does the thermal energy of the liquid in the larger beaker compare to the thermal energy of the liquid in the smaller beaker?
A. The liquid in the larger beaker has the same amount of thermal energy as the liquid in thesmaller beaker.
B. The exact volume of liquid in each beaker must be known to compare the thermal energyof the liquids.
C. The liquid in the larger beaker has less thermal energy than the liquid in the smaller beaker.
D. The liquid in the larger beaker has more thermal energy than the liquid in the smaller beaker.
Chemistry
1 answer:
azamat3 years ago
6 0

Answer:

Answer choice B

Explanation:

Since you do not know the volume of the liquid in each beaker, the one in the smaller beaker could have more substance and therefore more thermal energy. If they had the same amount of substance, then the more voluminous one would radiate faster. However, since you do not know this, there is no way to tell. PM me if you have more questions. Hope this helps!

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3 years ago
If you run this reaction with 15 g of CuCl2 and 20 g NaNO3, what is the theoretical yield of NaCl?
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The theoretical yield of a substance is the amount of the mass that is calculated from stoichiometry. The mass of sodium chloride produced is 13.03 gms.

<h3>What is mass?</h3>

Mass of the substance is a multiplication of the molar mass and moles.

The balanced reaction is given as:

CuCl₂ + 2NaNO₃ ⇒ 2NaCl + Cu(NO₃)₂

Moles of copper chloride are calculated as: 15 ÷ 134.45 = 0.115 moles

Moles of sodium nitrate are calculated as: 20 ÷ 84.99 = 0.2353 moles

From the reaction, 1 mole of copper chloride gives 2 moles of sodium chloride so, 0.115 moles of copper chloride will produce 0.223 moles.

Similarly, 2 moles of sodium nitrate produce 2 moles of sodium chloride so, 0.2353 moles produce 0.4706 moles.

From this, it can be concluded that copper chloride is a limiting reagent and will be used to calculate the mass of NaCl.

Mass of NaCl is calculated as: Mass = 0.223 moles × 58.44 = 13.03 gms.

Therefore, 13.03 gms is the theoretical yield of sodium chloride.

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