All categories

3 years ago

The main function of the respiratory system is to –

Chemistry

2 answers:

inn [45]3 years ago

6 0

The answer is D. Exchange gases, mostly carbon dioxide and oxygen, between the body and atmosphere!

34kurt3 years ago

3 0

The answer is d I believe

You might be interested in

The average lung capacity of a human is 6.0L.

Darya [45]

Answer:

(a) 0.25 mol

(b) 0.11 mol

Explanation:

(a)

We use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the gas = 1.00 atm

V = Volume of the gas = 6.0 L

T = Temperature of the gas = 298 K

R = Gas constant = $0.0821\text{ L.atm }mol^{-1}K^{-1}$

n = number of moles = ?

Putting values in above equation, we get:

$1.00 atm\times 6.0L=n\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 298K\\\\n=\frac{1.00\times 6.0}{0.0821\times 298}=0.25mol$

(b)

We use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the gas = 0.296 atm

V = Volume of the gas = 6.0 L

T = Temperature of the gas = 200 K

R = Gas constant = $0.0821\text{ L.atm }mol^{-1}K^{-1}$

n = number of moles = ?

Putting values in above equation, we get:

$0.296 atm\times 6.0L=n\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 200K\\\\n=\frac{0.296\times 6.0}{0.0821\times 200}=0.11mol$

(c)

We use the equation given by ideal gas which follows:

$PV=nRT$

where,

P = pressure of the gas = 30 atm

V = Volume of the gas = 6.0 L

T = Temperature of the gas = 250 K

R = Gas constant = $0.0821\text{ L.atm }mol^{-1}K^{-1}$

n = number of moles = ?

Putting values in above equation, we get:

$30 atm\times 6.0L=n\times 0.0821\text{ L.atm }mol^{-1}K^{-1}\times 250K\\\\n=\frac{30\times 6.0}{0.0821\times 250}=8.77mol$

8 0

4 years ago

Which statement is true about a neutral solution?

Sonbull [250]

Answer:

Explanation:

3 0

3 years ago

How do the properties of elements change as you move across a period

denpristay [2]

The number of shells increase, the energy level their outer shell have decreases as we go down wards,

3 0

3 years ago

Balanced equation: 2C6H8O6 + O2 = 2C6H6O6 + 2H2O

Viefleur [7K]

It might be .011355439 moles oxygen using the dimensional analysis formula i divided by the molar mass of the ascorbic acid then multiplied by the molar mass of the O2

5 0

3 years ago

Is Cu^2+ + 2Br^- --> Cu + Br2 a spontaneous or non-spontaneous redox reaction?

lawyer [7]

The reaction above is a spontaneous reaction

Cu^2+ + 2Br^- --> Cu + Br2

<h3>What is spontaneous redox reaction?</h3>

A spontaneous redox reaction is a special type of redox reaction which involves the release of energy where the electrons are transferred from from an anode to the cathode

General spontaneous redox reactions is found mostly in electrochemical cells

So therefore, the reaction above is a spontaneous reaction.

Cu^2+ + 2Br^- --> Cu + Br2

Learn more about spontaneous redox reactions:

brainly.com/question/4428247

#SPJ1

3 0

2 years ago