CHEMISTRY HIGH SCHOOL

47.0ml of a HBr solution were titrated with 37.5ml of a 0.215M LiOH solution to reach the equivalence point. what is the molarity of the HBr solution

Answers

Answer 1

Answer:

Hello!

The molarity of the HBr solution is 0,172 M.

Why?

The neutralization reaction between LiOH and HBr is the following:

HBr(aq) + LiOH(aq) → LiBr(aq) + H₂O(l)

To solve this exercise, we are going to apply the common titration equation:

$M1*V1=M2*V2$

$M1=(M2*V2)/(V1)= (0,215 M * 37,5 mL)/(47 mL)=0,172 M$

Have a nice day!

Answer 2

Answer:

Answer:

0.172

Explanation:

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He accepted value for the density of liquid mercury is 13.5336 g/mL. Four scientists measure the density of liquid mercury in their individual laboratories. The most accurate measurement is made by

Answers

Answer;

-The most accurate measurement is made by;

C. Dr. Smith, who measures 13.54 g/mL.

Explanation;

-The absolute density (how much a given volume of the substance weighs) of mercury is 13593 kilograms per cubic meter. It can also be stated as 13.56 g/cm^3. Accuracy measures the nearness of a calculation to the true value.

-In this case; the measurement by Dr. Smith is near the true value 13.56 g/cm^3, as compared to the measurements by other scientists.That is Dr. Chopra, who measures 13.487 g/mL. Dr. Thompson, who measures 13.5 g/mL. and Dr. Tyler, who measures 13.9336 g/mL.

The most accurate measurement is made by Dr. Smith. He measures this as 13.54 g/ml.

Besides oxygen and hydrogen, which element is most abundant within the human body? iodine (I) boron b. nitrogen (N) carbon
c.

Answers

its carbon dioxide we exhale carbon along with oxygen

One mole of an ideal gas is held at standard conditions. At what Kelvin temperature would the pressure be doubled?

Answers

The pressure of the gas will become double when its Kelvin temperature becomes $\boxed{{\text{twice}}}$ its initial value.

Further Explanation:

Ideal gas equation:

Ideal gas is just a theoretical concept and practically no gas can act as ideal. It can be considered as group of random moving particles having perfectly elastic collisions between them.

Ideal gas equation for one mole of gas is mentioned below.

PV = RT …… (1)

Here,

P is the gas pressure.

V is the gas volume.

T is the absolute temperature of gas.

R is the universal gas constant.

Standard conditions refer to state when pressure of gas is 1 atm and its temperature is 273 K.

Consider P’ and T’ to be new pressure and temperature respectively while all other terms in ideal gas equation remains constant. Equation (1) then modifies as follows:

P’V = RT’ …… (2)

Since new pressure is doubled, P’ becomes 2P. Equation (2) becomes,

(2P)V = RT’ …… (3)

Dividing equation (3) by equation (1), we get:

$\frac{{\left( {{\text{2P}}} \right){\text{V}}}}{{{\text{PV}}}} = \frac{{{\text{RT'}}}}{{{\text{RT}}}}$ …… (4)

Solving for T’,

${\text{T'}} = {\text{2T}}$

Therefore pressure is doubled when temperature becomes twice its initial value.

Learn more:

Which statement is true for Boyle’s law? brainly.com/question/1158880
Calculation of volume of gas: brainly.com/question/3636135

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Ideal gas equation

Keywords: ideal gas equation, R, T, P, V, 2P, 2T, pressure, volume, universal gas constant, P’, T’, standard conditions.

The volume should be kept in constant condition.
Then we go $PV=nRT P/T = constant P1/T2 =P2/T1 T2=P1 T1 /P2$
and if P2 is equal to 2P1, we have $T2=P1T1/2P1=1/2 T1$
which means that needed temperature is half of the initial temperature

With #27. if you can do at least two and explain how

THANK YOU

Answers

KOH - Potassium hydroxide (The compound for potassium is K, hence the first part, and OH is for hydroxide so when you put them together it makes potassium hydroxide.. pretty self explanatory)
Ca(NO3)2 - Calcium nitrate (The symbol for calcium is Ca, next is NO which is nitrate and the 3 means that there are 3 Nitrate compounds..I am not 100% sure what the 2 means at the end, but I am guessing it means that there are 2 calcium nitrate compounds in all.)
MgCO3 - Magnesium carbonate
Na3PO4 -Trisodium phosphate
LiNO3 - Lithium Nitrate
Mg(C2H3O2)2 - Magnesium acetate

Alright, so to do this, you need to know the name of the elements and compounds, since all of these are ionic compounds which have different naming rules than covalent compounds, all you need is a periodic table and an ion chart. I'll do the first column.

A. Calcium Nitrate

B. Potassium Hydroxide

C. Magnesium Carbonate.

I also am including a picture of an ion chart that include almost all of the ions to help you with the rest of them.

1. A tuning fork has a frequency of 280 hertz, and the wavelength of the sound produced is 1.5 meters. Calculate the velocity of the wave. - Answer:
2. A wave is moving toward shore with a velocity of 5.0 m/s. If its frequency is 2.5 hertz, what is the wavelength?
- Answer:
3. A jump rope is shaken producing a wave with a wavelength of 0.5 m. with the crest of the wave passing a certain point 7 times per second. What is the velocity of the wave?
- Answer:
4. The lowest pitch that the average human can hear has a frequency of 20.0 Hz. If sound with this frequency travels through air with a speed of 331 m/s, what is its wavelength?
- Answer:
5. A microwave has a frequency of 4,255 Hz. and a wavelength of 0.05 m. What is the microwave’s velocity?
- Answer:
6. A sound wave travels with a velocity of 460 m/s and has a frequency of 820 Hz. What is its wavelength?
- Answer:
7. A wave at sea travels with a velocity of 32 m/s. If it has a wavelength of 8 m. what is its frequency?
- Answer:
8. What is the frequency of a wave that has a velocity of 21.3 m/s and a wavelength of 7.8 m?
- Answer:

Answers

Based on the calculation, the velocity of this wave is equal to 420 m/s.

Given the following data:

Frequency of turning fork = 280 hertz.

Wavelength of sound produced = 1.5 meters.

How to calculate the velocity of a wave?

Mathematically, the velocity of a wave is calculated by using this formula:

V = λF

Where:

F is the frequency of a wave.

V is the velocity of a wave.

λ is the wavelength of a wave.

Substituting the given parameters into the formula, we have;

V = 1.5 × 280

V = 420 m/s.

Note: You should use the above formula to solve the other questions.

Read more on frequency here: brainly.com/question/19250621

#SPJ2

velocity = frequency x wavelength. 1) v = 280 x 1.5 = 420m/s 2) w = v / f = 5 / 2.5 = 2m

Describe the events that occur as water molecules start in hot bath water and end up on the surface of the bathroom mirror.

Answers

This happens because of evaporation and condensation. The warm water speeds up the evaporation process. This means that water molecule escapes from the liquid phase to the vapor phase. The mirror is in a relatively cooler temperature compared to the hot bath enough to condense the vapor. When the vapor is in contact with the mirror, condensation happens and turns the vapor molecules into droplets of liquid on the mirror surface.

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