CHEMISTRY HIGH SCHOOL

The molar mass of KCl is 74.55 g/mol. If 8.45 g KCl are dissolved in 0.750 L of solution, what is the molarity of the solution?0.113 M
0.151 M
6.62 M
11.3 M

Answers

Answer 1

Answer:

Molarity = 0.1516 mol.L⁻¹

Solution:

Molarity is the amount of solute dissolved per unit volume of solution. It is expressed as,

Molarity = Moles / Volume of Solution ----- (1)

Data Given;

Mass = 8.45 g

Volume = 0.750 L

Step 1: Calculate Moles for given mass as,

Moles = Mass / M.mass

Moles = 8.45 g / 74.55 g.mol⁻¹

Moles = 0.1133 mol

Step 2: Calculating Molarity:

Now, putting value of Moles and Volume in eq. 1,

Molarity = 0.1133 mol ÷ 0.750 L

Molarity = 0.1516 mol.L⁻¹

Answer 2

Answer:

Molar concentration or molarity is defined as the ratio of moles of a solute dissolved in the given volume of the solvent.

How do you calculate the molarity using the formula?

Given:

Molar mass of Potassium Chloride = 74.55 g/mol
Given the mass of Potassium Chloride = 8.45 g
The volume of the solution = 0.750 L

Now, to calculate the number of moles, we get:

$\rm Moles &=(Mass)/(Molar Mass)\n\n\nMoles &= (8.45)/(74.55)\n$

Moles = 0.113 mol

Then, the molarity of the solution will be:

$\rm Molarity &= (number \; of \; moles)/(Volume\;of \; Solution)\n\n\n\rm Molarity &= (0.113)/(0.151)$

Molarity = 0.1516 mol/L

Thus, the molarity of the given solution is 0.1516 mol/L. The correct answer is Option B.

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Perform the followingmathematical operation, andreport the answer to theappropriate number ofsignificant figures.1204.2 +4.79613 = [ ? ]
In clinical brachytherapy, the supervision of radio elements and dose interpretation are performed by the therapeutic ____________________ (two words).
In general, if the temperature of a chemical reaction is increased, the reaction ratea. increases. b. decreases. c. remains the same. d. cannot be predicted.
Which of the following is a physical or chemical characteristic of a mineral?

Cl(g) + H2----> HCl(g) +H
Do interaction can occur at room temperature

Answers

This is not the proper equation, the equation should be:
Cl2 + H2 ----> 2HCl
This does not happen at room temperature and needs a source of activation energy such a spark.

which of the following is a strong electrolyte. sugar, sodium chloride, honey vinager, carbon tetrachloride?

Answers

Electrolyte is a substance, once dissolved in water, produces an electically conducting solution or current. Electrolytes are classified as weak electrolytes or strong electrolytes.

Sugar is a nonelectrolyte. It does dissolve in water but it dissolves as molecules not ions.

Sodium chloride is a strong electrolyte. It dissolves as 100% ions in solutions.

Honey vinegar. some acid found in vinegar are considered weak electrolytes.

Carbon tetrachoride is not an electrolyte. It doesn't break down into ions because its bond is very strong and doesn't break under normal conditions of a solution.

Final answer:

Sodium chloride is the strong electrolyte among the options provided. Strong electrolytes are substances that completely dissociate into ions when dissolved in water. Other examples of strong electrolytes include strong acids like hydrochloric acid and strong bases such as sodium hydroxide.

Explanation:

Among the options provided, sodium chloride is a strongelectrolyte. Electrolytes are substances that yield ions when dissolved in water. Specifically, strong electrolytes dissociate completely into ions when dissolved, leading to high conductive capacity, which is characteristic of strong electrolytes such as sodium chloride. Other substances like sugar, vinegar, or carbon tetrachloride, do not dissociate into ions when dissolved, making them non-electrolytes rather than strong electrolytes.

Examples of other strong electrolytes include strong acids like hydrochloric acid (HCl), which fully dissociates into hydrogen and chloride ions. Strong bases like sodium hydroxide (NaOH) are also strong electrolytes as they readily donate OH¯ when dissolved in water. On the other hand, weak acids and bases, such as the acids in tomato juice or vinegar, do not completely dissociate and are considered weak electrolytes.

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A solution of NaOH is titrated with H2SO4. It is found that 20.05 mL of 0.3564 M H2SO4 solution is equivalent to 43.42 mL of NaOH solution. What is the concentration of NaOH?

Answers

Answer : The concentration of NaOH is, 0.336 M

Explanation:

To calculate the concentration of base, we use the equation given by neutralization reaction:

$n_1M_1V_1=n_2M_2V_2$

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is $H_2SO_4$

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=2\nM_1=0.3564M\nV_1=20.05mL\nn_2=1\nM_2=?\nV_2=43.42mL$

Putting values in above equation, we get:

$2* 0.3564M* 20.05mL=1* M_2* 43.42mL$

$M_2=0.336M$

Thus, the concentration of NaOH is, 0.336 M

Scientists use the Celsius scale as the si unit of temperature. True or False

Answers

false, it's Kelvin. Kelvin is another form of metric units used in the si system.

false they use kelvin scale cause kelvin is the SI unit of temperature

The hormone thyroxine is secreted by the thyroid gland and has the formula: C15H17NO4I4. How many milligrams of Iodine can be extracted from 15.0 grams of thryoxine?

Answers

Answer : The mass of iodine extracted can be 9796.7 mg

Explanation : Given,

Mass of thryoxine = 15.0 g

Molar mass of thryoxine = 776.86 g/mole

The molecular formula of thryoxine is, $C_(15)H_(11)NO_4I_4$

In $C_(15)H_(11)NO_4I_4$ compound, there are 15 moles of carbon, 11 moles of hydrogen, 1 mole of nitrogen, 4 moles of oxygen and 4 moles of iodine.

First we have to determine the moles of thryoxine.

$\text{Moles of thryoxine}=\frac{\text{Mass of thryoxine}}{\text{Molar mass of thryoxine}}=(15.0g)/(776.86g/mole)=0.0193moles$

Now we have to determine the moles of iodine.

As, 1 mole of thryoxine has 4 moles of iodine

So, 0.0193 mole of thryoxine has $4* 0.0193=0.0772$ moles of iodine

Now we have to determine the mass of iodine.

$\text{Mass of iodine}=\text{Moles of iodine}* \text{Molar mass of iodine}$

$\text{Mass of iodine}=(0.0772mole)* (126.9g/mole)=9.7967g=9796.7mg$

conversion used : (1 g = 1000 mg)

Therefore, the mass of iodine extracted can be 9796.7 mg

I'm pretty sure it's 9726 milligrams of iodine. Hope this helps.

Which step would help a student find the molecular formula of a compound from the empirical formula?

Answers

First, you need to be given the gram formula mass of this molecular or related conditions that can calculate this. Then you need the empirical formula and calculate the gram formula mass of empirical formula. Then use them to get the ratio. Finally you can get the molecular formula.

Final answer:

To find the molecular formula from the empirical formula, first calculate the empirical formula mass. Then, divide the molecular or molar mass by the empirical formula mass to find the number of empirical formula units per molecule. Finally, multiply the subscript of each element in the empirical formula by this number to get the molecular formula.

Explanation:

The process of finding the molecular formula from the empirical formula involves a few steps. First, you need to determine the empirical formula of a compound, which is the simplest positive integer ratio of atoms present in a compound. After you have the empirical formula, you can calculate the empirical formula mass by summing up the average atomic masses of all the atoms in the empirical formula.

Next, compare the compound's molecular or molar mass (which you should know or have been given) to the empirical formula mass. This comparison is done by dividing the molecular or molar mass by the empirical formula mass. This will give you the number of empirical formula units, denoted as n, per molecule of the compound.

The final step is to take the empirical formula and multiply the subscript of each element in it by n. This will give you the molecular formula of the compound.