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3 years ago

When 500 g of water is cooled from 80.0°C to 10.0°C, how much heat energy is lost?

Chemistry

2 answers:

vampirchik [111]3 years ago

6 0

I don’t know

Explanation:

Rashid [163]3 years ago

4 0

This is a solved problem that is close I cannot tell u the direct answer but I hope this STEP BY STEP layout will help

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The combustion of toluene has a δerxn of −3.91 × 103kj/mol. when 1.55 g of toluene (c7h8) undergoes combustion in a bomb calorim

maw [93]

Answer: The heat capacity of the bomb calorimeter is $2.84 kJ/g^oC$ .

Explanation:

$\Delta H_{reaction}=-3.91\times 10^3 kJ/mol=-3.91\times 10^6 J/mol(1kJ=1000J)$

Given mass of toluene = 1.55 g

Number of moles of Toluene:

$=\frac{\text{Given mass of toluene}}{\text{Molecular mass of toluene}}=\frac{1.55}{92.14 g/mol}=0.0168 moles$

Energy required by 0.0168 moles of toluene= $\Delta H_{reaction}\times 0.0168 moles=-3.91\times 10^6 J/mol\times 0.0168 mol=-0.065688\times 10^6 J$

Since heat released on combustion of 0.0168 moles toluene, this heat will get absorbed by the bomb calorimeter ,then (Q) will be:

$Q=0.065688\times 10^6 J$

$\Delta T= 37.92^oC-23.02^oC=14.9^oC$

$Q=mc\Delta T=0.065688\times 10^6 J=1.55 g\times c \times (14.9^oC)$

$c=2.84\times 10^3 J/g^oC=2.84 kJ/g^oC$

The heat capacity of the bomb calorimeter is $2.84 kJ/g^oC$ .

8 0

3 years ago

Summarize the characteristics of each type of element below

aniked [119]

What are the elements?

7 0

3 years ago

The forms a food substance into small balls and then pushes them into the_____.

KatRina [158]

During the digestion process, the first step would be mastication, lubrication with the saliva, and later on is being formed into a bolus. Bolus is the term used for food substance that is turned into small balls. When the bolus is formed, this is then pushed or moved to the stomach.

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2 years ago

Which statement best describes the relationship between photosynthesis and cellular respiration?

Elena L [17]

Answer:

Photosynthesis removes carbon from the atmosphere, and cellular respiration releases carbon back into the atmosphere.

Explanation:

The first option clearly expresses the relationship between photosynthesis and cellular respiration.

Cellular respiration releases carbon back into the atmosphere whereas photosynthesis removes the carbon from the atmosphere.

Photosynthesis is the process whereby green plants manufacture their food using carbon dioxide and water.

In cellular respiration, the product of the photosynthesis is used by organisms to produce energy.

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3 years ago

You pimp air into your volleyball the ball mass is?

Mumz [18]

Answer: When it comes to maintaining your volleyball ball, there are some things you should get accustomed to doing. One of the most important is knowing how to inflate it. The professionals keep the psi of a ball at 0.3 to 0.325 for indoor balls and at 0.175 to 0.225 for beach, or outdoor, balls.

Explanation:

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4 0

3 years ago