During a titration, the pH of an analyte solution containing HA(aq) is 3.92 and the ratio of [A–]/[HA] is 0.41. What is the Ka of HA?

Answer:

48.8%

Explanation:

The reaction has a 1:1 mole ratio so;

Number of moles of benzoic acid reacted = mass/molar mass = 3.8 g/122.12 g/mol = 0.03 moles

So;

0.03 moles of methyl benzoate is formed in the reaction

Mass of methyl benzoate formed = 0.03 moles * 136.15 g/mol = 4.1 g

percent yield = actual yield/theoretical yield * 100/1

percent yield = 2.0 g/4.1 g * 100 = 48.8%

Answer: 0.133 mol/l

Explanation: molality = concentration = 0.400 mol/3.0 l

Answer:

the pig's average speed is 7 m/s

The average speed of a moving body is the ratio of the distance travelled to the time of travel. Here, the speed of the pig running 46 meters in 6 seconds is 7.6 m/s.

The speed of an object is a physical quantity that measures the distance travelled by the object per unit time. Hence, it is the ratio of distance travelled to the  time taken for the travel. The rate of speed is called velocity. Bot are having the standard unit of m/s.

Given that,

distance covered by the pig = 46 meters

time taken = 6 seconds

speed  = distance/time.

Average speed of the pig = 46 meters/ 6 seconds = 7.6 m/s.

Therefore, if the small pig runs 46 meters in 6 seconds, it is having an average speed of 7.6 m/s.

Find more on average speed :

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Answer:

I guess it WATER

Explanation:

Stop cheating and use your brains kiddos

Answer:

The concentration of the original hydrochloric acid solution is - 0.1856 M

Explanation:

Lets calculate-:

Neutralization reaction follows dilute principle

   [tex](N_1)(V_1)=(N_2)(V_2)[/tex] For titration between NaOH and HCl

  [tex](M_1)(V_1)_H_C_l=(M_2)(V_2)_N_a_O_H[/tex]

Putting the given values ,

    [tex]M_1\times 20.06ml=0.149M\times25.0ml[/tex]

       [tex]M_1_H_C_l=\frac{0.149\times25.0}{20.06}[/tex]

            = 0.1856 M

Hence , the concentration of hydrochloric acid solution is 0.1856 M.

Cars rust because when metal comes into contact with water or some sort of water form, it will make the surface wet. If the metal is wet for too long, it will start to soak up the water, therefore making it rusty. The salt will also rust a car. It does this because the mix of carbon dioxide and oxygen in the salt will eat away at the car, making it rust faster. Hope this helps!

Answer:

See explanation

Explanation:

Ne is a noble gas. It already has an octet of electrons hence, the electron affinity of neon is negative.

Br is a halogen, halogens need one electron to complete their octet. The electron affinity for bromine is negative.

Sodium is a metal that has only one electron in its outermost shell. The electron affinity of sodium is positive.

Magnesium is a metal having two electrons in its outermost shell. The electron affinity of magnesium is positive.

Chlorine is another halogen, energy is released when an electron is added to chlorine hence the electron affinity of chlorine is negative.

Answer:

Abiotic does not mean dead. It means never alive.

Examples of abiotic factors are rocks. weather

Explanation:

because

Explanation:

(formula)

Answer:

its A screw :))) your welcome

Answer:

25.155 gram

Explanation:

HCl(aq.) + NaOH(aq.) ⇒ NaCl + H2O

According the above equation equal number of moles of reactant are producing same number of moles of products.

Now, no. mole of HCl = 15.7/(1+35.5) = 0.43 moles

no. of moles of NaOH = 27/(23+16+1) = 0.675 moles

Since  the  amount  of  sodium  hydroxide  exceeds  the  amount  of  hydrochloric  acid,  the maximum amount of each substance participating in the reaction is HClν ν  0.43 moles .Therefore, the maximum amount of NaCl  that can be produced is as follow

= (23+35.5)×0.43 = 25.155 gram

by using pro.gram..

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Answer: The correct answer is 5.00 moles

Explanation:

Answer:

interstitial is correct my child

Explanation:

Answer:

oxygen is the correct answer

Explanation:

you need oxygen in order to breath, eat, drink, and many other stuf! hope i helped!

Answer:

chemistry wow

Explanation:

Answer:

Explanation

Answer:

It changes into ice.

Explanation:

solid form of water. When water vapor in the atmosphere cools down, it will condense and change back into liquid water, forming clouds

Answer:

It changes into ice,

Explanation:

Because if it's hot it would melt or evaporate, but if it's LOSING heat it would mean the opposite, and the only one that supports this is that "it changes into ice". Hope this helped, sorry i wasn't on for some time

Answer:

21.6 grams

Explanation:

First we convert 10 g of N₂ into moles, using its molar mass:

Then we convert 0.36 moles of N₂ into moles of NO, using the stoichiometric coefficients of the balanced reaction:

Finally we convert 0.72 NO moles into grams, using its molar mass:

Answer:

I'm going to go with conduction

Explanation:

At first I thought it was combustion but I read the problem incorrectly. It seems like the liquid boils after you put them on the hot plate.

It's most likely conduction because heat and energy is being transferred into the liquid from the hot plate

Answer:

1. Rubidium metal reacts very rapidly with water to form a colorless basic solution of rubidium hydroxide (RbOH) and hydrogen gas (H2).

2. Rubidium sinks because it is less dense than water. It reacts violently and immediately, with everything leaving the container. Rubidium hydroxide solution and hydrogen are formed.

Answer:

B

Explanation:

I took the assessment

Answer:

Using my searching skills, the answer is motor neurons.

Explanation:

Motor neurons carry impulses from the brain and spinal cord to muscles or glands.