CHEMISTRY HIGH SCHOOL

A laboratory requires 2.0 L of a 1.5 M solution of hydrochloric acid (HCl), but the only available HCl is a 12.0 M stock solution. How could you prepare the solution needed for the lab experiment? show all work to find your answer

Answers

Answer 1

Answer:

Answer: The volume of stock HCl solution required to make laboratory solution will be 0.25L

Explanation:

To calculate the volume of stock solution required to make the laboratory solution, we use the equation:

$M_1V_1=M_2V_2$

where,

$M_1\text{ and }V_1$ are the molarity and volume of stock solution.

$M_2\text{ and }V_2$ are the molarity and volume of laboratory solution.

We are given:

$M_1=12M\nV_1=?L\nM_2=1.5M\nV_2=2L$

Putting values in above equation, we get:

$12* V_1=1.5* 2\n\nV_1=0.25L$

Hence, the volume of stock HCl solution required to make laboratory solution will be 0.25L

Answer 2

Answer: The amount of the solute is constant during dilution. So the mole number of HCl is 2*1.5=3 mole. The volume of HCl stock is 3/12=0.25 L. So using 0.25 L stock solution and dilute to 2.0 L.

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What is the concentration of a solution that has a volume of 2.5L and contains exactly 2.125 moles of calcium phosphate

Answers

Answer:

0.85 mol/L.

Explanation:

Molarity is defined as the no. of moles of solute dissolved in a liter of the solution.

M = (no. of moles of solute)/(Volume of the solution (L))

no. of moles of calcium phosphate = 2.125 mol.

Volume of the solution = 2.5 L.

∴ M of calcium phosphate = (2.125 mol)/(2.5 L) = 0.85 mol/L.

A salt is best described as a compound that is formed from the reaction between

Answers

mical Compound

In chemistry, a salt is an ionic compound that results from the neutralization reaction of an acid and a base. Salts are composed of related numbers of cations and anions so that the product is electrically neutral.

Answer:

An acid and a base

Explanation:

A change of phase never accompanies a. a change in volume b. a change in pressure
c. a change in temperature
d. a change in density
e. a change in structure

Answers

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Electrical motors work based on the fact that a wire carrying current can produce a ______________ field, which can lead to production of mechanical energy through rotation. A gravitational B parallel C magnetic D alternating

Answers

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Calculate the percentage of yield when 20 grams of sodium chloride solution reacts with an excess amount of silver nitrate solution knowing that 45 grams of silver chloride precipitated

Answers

Percentage % yield = 91.8%

Given:

20 g NaCl

45 g AgCl

To find:

% yield=?

The balanced chemical equation will be:

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

First, we need to calculate moles of NaCl.

$\text{Number of Moles}=\frac{\text{Given Mass}}{\text{Molar Mass}} \n\n\text{Number of Moles}=(20)/(58.44) \n\n\text{Number of Moles}= 0.342 moles$

Then, calculate moles of AgCl from equation:

$\text{mol of AgCl}= 1/1 * \text{ mol NaCl}\n\n\text{mol of AgCl}= 1/1 * 0.342\n\n\text{mol of AgCl}= 0.342$

Mass AgCl(theoretical) :

$\text{Mass of AgCl}= mol * MW\n\n\text{Mass of AgCl}= 0.342 x 143,32 g/mol\n\n\text{Mass of AgCl}= 49.02 g$

Now, calculate for percentage yield.

$\%yield =(actual)/(theoretical) * 100\%\n\n\%yield = (45/49.02) * 100\%\n\n\%yield = 91.8\%$

The percentage yield will be 91.8%.

Learn more:

brainly.com/question/21091465

%yield = 91.8

Further explanation

Given

20 g NaCl

45 g AgCl

Required

%yield

Solution

Reaction

NaCl + AgNO₃ ⇒ AgCl + NaNO₃

mol NaCl :

= mass : MW

= 20 g : 58,44 g/mol

= 0.342

mol AgCl from equation :

= 1/1 x mol NaCl

= 1/1 x 0.342

= 0.342

Mass AgCl(theoretical) :

= mol x MW

= 0.342 x 143,32 g/mol

= 49.02 g

%yield = (actual/theoretical) x 100%

%yield = (45/49.02) x 100%

%yield = 91.8

The combustion of fossil fuels releases ____ into the atmosphere. oxygen

gasoline

carbon

glucose

Answers

Answer: The correct answer is carbon.

Explanation:

Combustion reaction is defined as the reaction in which a hydrocarbon burns in oxygen or reacts with oxygen gas to produce carbon dioxide and water molecule.

Fossil fuels are defined as the hydrocarbons which mainly contains coal, fuel oil, natural gas etc..

When fossil fuels are burned in air, it mainly releases carbon dioxide, sulfur dioxide, methane, nitrous oxide etc..

The major component released during the combustion of fossil fuels is carbon.

Hence, the correct answer is carbon.

CARBON because fossil fuells

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