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3 years ago

Which structure of the respiratory system connects the pharynx to the trachea?

Chemistry

2 answers:

Citrus2011 [14]3 years ago

8 0

Answer:

Larynx

Explanation:

It is a cartilaginous structure inferior to the laryngopharynx that connects the pharynx to the trachea and helps regulate the volume of air that enters and leaves the lungs.

muminat3 years ago

6 0

Larynx connects the pharynx to the trachea and is also part of the respiratory system

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Find the Molarity of a solution containing 2.5 moles of solute in 15000 milliliters.

garri49 [273]

Molarity is defined by the number of moles of a substance dissolved in a number of liters in solution. 15,000 milliliters is equal to 15 liters, so

2.5/15 = 0.1666... M

The molarity of this solution would be 0.167.

6 0

3 years ago

30.00 ml of a h2so4 solution with an unknown concentration was titrated to a phenolphthalein endpoint with 44.45 ml of a 0.1489

kodGreya [7K]

The concentration of the H2SO4 solution should be 0.1101 M.

Calculation of the concentration:

Since

Volume of H2SO4 = 30.00 mL = 0.030 L

Volume of NaOH= 44.45 mL = 0.04445 L

Concentration of NaOH= 0.1489 M

Now

The balanced equation is

H2SO4 + 2NaOH → Na2SO4 + 2H2O

Now the concentration of the H2SO4 solution is

b*Ca*Va = a*Cb*Vb

here, b = the coefficient of NaOH = 2

Ca = ?

Va = the volume of H2SO4= 30.0 mL = 0.030 L

a = the coefficient of H2SO4 = 1

Cb = the concentration of NaOH = 0.1489 M

Vb = the volume of NaOH = 44.45 mL = 0.04445 L

Now

2*Ca*0.030 = 1* 0.1489* 0.04445

0.060 * Ca = 0.00661

Ca = 0.1101 M

Hence, The concentration of the H2SO4 solution is 0.1101 M.

Learn more about concentration here:

brainly.com/question/14106631

#SPJ4

7 0

1 year ago

The alcohol functional group contains the elements of (a)______ and (b)______

sdas [7]

Answer:

oxygen and hydrogen

Explanation:

the alcohol group is known as the -OH group, which has oxygen bonded to a hydrogen

7 0

3 years ago

Selma made an error while creating a chart to describe the technological design process for a new vacuum. Which best describes h

andre [41]

Answer:

Explanation:

just did the test

3 0

4 years ago

In a closed container, the vapor pressure of 10 mL of ethanol at 20 degrees C is 5.85 kPa. What is the vapor pressure of 20 mL o

natulia [17]

Answer:

${P_2}=2.925\ kPa$

Explanation:

At same temperature and same number of moles, Using Boyle's law

${P_1}\times {V_1}={P_2}\times {V_2}$

Given ,

V₁ = 10 mL

V₂ = 20 mL

P₁ = 5.85 kPa

P₂ = ?

Using above equation as:

${P_1}\times {V_1}={P_2}\times {V_2}$

${5.85\ kPa}\times {10\ mL}={P_2}\times {20\ mL}$

${P_2}=\frac{{5.85}\times {10}}{20}\ kPa$

${P_2}=2.925\ kPa$

6 0

3 years ago