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Mademuasel [1]
3 years ago
15

In the example above, imagine that the sunlight, solar cell, and fan form a closed system and no heat is generated. In this situ

ation, after 1,000 kilojoules of light energy enter the system, kilojoules of electric energy are transformed into kilojoules of kinetic energy.
Chemistry
2 answers:
Sergio [31]3 years ago
7 0

1000 kilojoules of electrical energy gets transformed into 1000 kilojoules of kinetic energy.


velikii [3]3 years ago
5 0

Answer:

both drop downs are 1000

Explanation:

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If there are 160 Calories in 28 g in 1 serving of Flamin' Hot Cheetos, how many gram(s) of Cheetos must you burn to raise the te
vagabundo [1.1K]

Answer:

3.5 g

Explanation:

The density of water is 1 g/mL. The mass (m) corresponding to 20.0 mL is 20.0 g.

We can calculate the heat (Q) required to raise the temperature of 20.0 mL of water 1 °C (ΔT).

Q = c × m × ΔT = 1 cal/g.°C × 20.0 g × 1 °C = 20 cal

where,

c is the specific heat capacity of water

There are 160 calories in 28 g of Cheetos. The mass that releases 20 cal is:

20 cal × (28 g/160 cal) = 3.5 g

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3 years ago
Before the use of technetium-99m, patients with high risk coronary artery disease were evaluated using thallium-201 which has a
agasfer [191]

Answer: 243 hours

Explanation:

Expression for rate law for first order kinetics is given by:

t=\frac{2.303}{k}\log\frac{a}{a-x}

where,

k = rate constant

t = age of sample

a = initial amount of the reactant = 5.000\mu g

a - x = amount left after decay process =  \frac{10}{100}\times 5.000\mu g=0.5\mu g

a) for completion of half life:

Half life is the amount of time taken by a radioactive material to decay to half of its original value.

t_{\frac{1}{2}}=\frac{0.693}{k}

k=\frac{0.693}{73.00hours}=9.49\times 10^{-3}hours^{-1}

b) for reducing the mass to 10.00 % of its original mass

t=\frac{2.303}{k}\log\frac{a}{a-x}

t=\frac{2.303}{9.49\times 10^{-3}}\log\frac{5.000}{0.5}

t=243hours

The time taken to reach 10.00 % of its original mass is 243 hours

3 0
3 years ago
COPERNICUS WHO WAS IT
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4 0
3 years ago
Which of the following is an inorganic compound?
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6 0
3 years ago
fills a 500.mL flask with 3.6atm of carbon monoxide gas and 1.2atm of water vapor. When the mixture has come to equilibrium she
enot [183]

Answer:

The answer to the question is

The pressure of carbon dioxide after equilibrium is reached the second time is 0.27 atm rounded to 2 significant digits

Explanation:

To solve the question, we note that the mole ratio of the constituent is proportional to their partial pressure

At the first trial the mixture contains

3.6 atm CO

1.2 atm H₂O (g)

Total pressure = 3.6+1.2= 4.8 atm

which gives

3.36 atm CO

0.96 atm H₂O (g)

0.24 atm H₂ (g)

That is

CO+H₂O→CO(g)+H₂ (g)

therefore the mixture contained

0.24 atm CO₂ and the total pressure =

3.36+0.96+0.24+0.24 = 4.8 atm

when an extra 1.8 atm of CO is added we get Increase in the mole fraction of CO we have one mole of CO produces one mole of H₂

At equilibrium we have 0.24*0.24/(3.36*0.96) = 0.017857

adding 1.8 atm CO gives 4.46 atm hence we have

 (0.24+x)(0.24+x)/(4.46-x)(0.96-x) = 0.017857

which gives x = 0.031 atm or x = -0.6183 atm

Dealing with only the positive values we have the pressure of carbon dioxide = 0.24+0.03 = 0.27 atm

7 0
3 years ago
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