Ask question

Ask question

All categories

3 years ago

14

What can be said about an endothermic reaction with a negative entropy change?

1 answer:

zvonat [6]3 years ago

6 0

The statement is false because endothermic reactions have a positive enthalpy change, because heat is being added to the system because it requires more energy to react

You might be interested in

The solubility of oxygen in lakes high in the Rocky Mountains is affected by the altitude. If the solubility of O2 from the air

IceJOKER [234]

Answer:

$1.75\cdot 10^{-4} M$

Explanation:

Henry's law states that the solubility of a gas is directly proportional to its partial pressure. The equation may be written as:

$S = k_H p^o$

Where $k_H$ is Henry's law constant.

Our strategy will be to identify the Henry's law constant for oxygen given the initial conditions and then use it to find the solubility at different conditions.

Given initially:

$S_1 = 2.67\cdot 10^{-4} M$

Also, at sea level, we have an atmospheric pressure of:

$p = 1.00 atm$

Given mole fraction:

$\chi_{O_2} = 0.209$

According to Dalton's law of partial pressures, the partial pressure of oxygen is equal to the product of its mole fraction and the total pressure:

$p^o = \chi_{O_2} p$

Then the equation becomes:

$S_1 = k_H \chi_{O_2} p$

Solve for $k_H$ :

$k_H = \frac{S_1}{\chi_{O_2} p} = \frac{2.67\cdot 10^{-4} M}{0.209\cdot 1.00 atm} = 0.001278 M/atm$

Now we're given that at an altitude of 12,000 ft, the atmospheric pressure is now:

$p = 0.657 atm$

Apply Henry's law using the constant we found:

$S_2 = k_H \chi_{O_2} p = 0.001278 M/atm\cdot 0.209\cdot 0.657 atm = 1.75\cdot 10^{-4} M$

8 0

3 years ago

Which is a physical property of milk?

inna [77]

C) Milk boils at about 212°F (100°C).

6 0

3 years ago

A student uses 5g of carbon to extract copper metal from its ore:

Umnica [9.8K]

Answer:

drt4gxhknwo

Explanation:

4 0

2 years ago

A woman is experiencing false labor if the contractions...

Allisa [31]

Answer:

Before "true" labor begins, you might have "false" labor pains, also known as Braxton Hicks contractions.

Explanation:

8 0

3 years ago

Read 2 more answers

How many atoms are in four molecules of oxygen gas

Dmitrij [34]

Answer:

8 oxygen atoms

Explanation:

One molecule of oxygen gas has two oxygen atoms (O2). If there are four molecules, then we multiply two by four to get 8 atoms.

8 0

3 years ago