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3 years ago

How do you know if the reaction is exothermic

1 answer:

5 0

Hey there!
Exothermic reactions release heat, causing its temperature to fall. If the reaction is lessening the temperature of the object while releasing all the heat, then you know that the reaction is indeed exothermic. Hope this helps!

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Atmospheric pressure at sea level is equal to a column of 760 mm Hg. Oxygen makes up 21 percent of the atmosphere by volume. The

Neporo4naja [7]

Answer: The partial pressure of oxygen is 160 mmHg

Explanation:

We are given:

Percent of oxygen in air = 21 %

Mole fraction of oxygen in air = $\frac{21}{100}=0.21$

To calculate the partial pressure of oxygen, we use the equation given by Raoult's law, which is:

$p_{O_2}=p_T\times \chi_{O_2}$

where,

$p_{O_2}$ = partial pressure of oxygen = ?

$p_T$ = total pressure of air = 760 mmHg

$\chi_{O_2}$ = mole fraction of oxygen = 0.21

Putting values in above equation, we get:

$p_{O_2}=760mmHg\times 0.21\\\\p_{O_2}=160mmHg$

Hence, the partial pressure of oxygen is 160 mmHg

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3 years ago

Saturated hydrocarbon molecules may be bonded in which type of structure?

poizon [28]

all of the above can be saturated molecules

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Describe the importance of the water cycle in the terms of;

nikitadnepr [17]

Answer:

ii.

Explanation:

Regulating weather patterns

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2 years ago

A gas has

Vaselesa [24]

Gases take the shape of their container and have no definite volume because they can diffuse indefinitely. Answer C.

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If log x = -0.761. What does x equal

kvasek [131]

The logarithm from my understanding can never be negative. You can check this on a calculator. You may have a negative if it is shown as -(log x).

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3 years ago