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3 years ago

I don't unerstand what I'm supposed to do for these

2 answers:

8 0

You just need to multiply the terms and transform to kj by dividing by 1000
1) 10.4kj
2) 14.5 kj
3) 44.8 kj
4) 1.04 kj

and there you go.

Anon25 [30]3 years ago

3 0

Explanation:

1000 J= 1 kJ

1. Heat = mass × c × Temperature change

= $175 g\times 0.79 J/g^oC\times 75^oC=10,368.75 J=10.36878 kJ\approx 10.4 kJ$

2.Heat = mass × c × Temperature change

= $352 g\times 1.65 J/g^oC\times 25^oC=14,520 J=14.520 kJ\approx 14.5 kJ$

3.Heat = mass × c × Temperature change

= $268 g\times 4.18 J/g^oC\times 40^oC=44,809.6 J=44.8096 kJ\approx 44.8 kJ$

4.Heat = mass × c × Temperature change

= $74 g\times 0.21 J/g^oC\times 67 ^oC=1,041.18 J=1.04118 kJ\approx 1.04 kJ$

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Answer:

The final temperature at 1050 mmHg is 134.57 $^{\circ}C$ or 407.57 Kelvin.

Explanation:

Initial temperature = T = 55 $^{\circ}C$ = 328 K

Initial pressure = P = 845 mmHg

Assuming final to be temperature to be T' Kelvin

Final Pressure = P' = 1050 mmHg

The final temperature is obtained by following relation at constant volume

$\displaystyle \frac{P}{P'}=\displaystyle \frac{T}{T'} \\ \displaystyle \frac{845 \textrm{ mmHg}}{1050 \textrm{ mmHg}} = \displaystyle \frac{328 \textrm{ K}}{T'} \\T' = 407.57 \textrm{ Kelvin}$

The final temperature is 407.57 K

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2 years ago

The partial pressure of N2 in the air is 593 mm Hg at 1 atm. What is the partial pressure of N2 in a bubble of air a scuba diver

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Answer: Partial pressure of $N_{2}$ at a depth of 132 ft below sea level is 2964 mm Hg.

Explanation:

It is known that 1 atm = 760 mm Hg.

Also, $P_{N_{2}} = x_{N_{2}}P$

where, $P_{N_{2}}$ = partial pressure of $N_{2}$

P = atmospheric pressure

$x_{N_{2}}$ = mole fraction of $N_{2}$

Putting the given values into the above formula as follows.

$P_{N_{2}} = x_{N_{2}}P$

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Now, at a depth of 132 ft below the surface of the water where pressure is 5.0 atm. So, partial pressure of $N_{2}$ is as follows.

$P_{N_{2}} = x_{N_{2}}P$

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2 years ago

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<h3>What is the Probability of spending at least half an hour on exactly one subject </h3>

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