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antiseptic1488 [7]
3 years ago
11

How many ml of 50 percent acid should be added to pure acid to make 70ml of 65 percent acid?

Chemistry
2 answers:
Oxana [17]3 years ago
8 0

Answer

Explanation:

thank u next thats the answer

alexandr1967 [171]3 years ago
6 0

Answer:

91 mL

Explanation:

In chemistry, to solve this kind of exercises, dilutions, and concentrations is common to use the following equation

                                              C1*V1=C2*V2

In which V1 refers to volume 1, in this case, is 70mL because is the quantity I have, the solution I can use to obtain another solution. C1 refers to the concentration of the solution I also have, in this case, 65%.

C2 and V2 refer to the volume and concentration of the solution I am looking for. So, if want to know V2, which is the volume I need to add, the only thing to do is find V2 in the equation:

                                               V2=C1*V1/C2

                                                V2= 65%*70mL/50%

                                                V2= 91mL

                                 

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PV=nRT

STP is 100kPa and 273.15K

PV/RT=n

n=17.3moles

Explanation:

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Calculate how many grams would be required to prepare 600. 0 ml of 0. 150 m of naf? molar mass of naf is 41. 9 g/mo
marta [7]

Considering the definition of molarity and molar mass, the mass of NaF required is 3.771 grams.

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

molarity=\frac{number of moles}{volume}

Molarity is expressed in units \frac{moles}{liters}.

<h3>Definition of molar mass</h3>

The molar mass of substance is a property defined as its mass per unit quantity of substance, in other words, molar mass is the amount of mass that a substance contains in one mole.

<h3 /><h3>Mass of NaF required</h3>

In this case, you know:

  • molarity= 0.15 M= 0.15 \frac{moles}{L}
  • number of moles= ?
  • volume= 600 mL= 0.6 L

Replacing in the definition of molarity:

0.15\frac{moles}{L} =\frac{number of moles}{0.6 L}

Solving:

0.15 \frac{moles}{L} × 0.6 L= number of moles

<u><em>0.09 moles= number of moles</em></u>

The molar mass of NaF is 41. 9 g/mol. So, you can apply the following rule of three: If by definition of molar mass 1 mole of the compound contains 41.9 grams, 0.09 moles of the compound contains how much mass?

mass=\frac{0.09 molesx41.9 grams}{1 mole}

<u><em>mass= 3.771 grams</em></u>

Finally, the mass of NaF required is 3.771 grams.

Learn more about

molar mass:

brainly.com/question/5216907

brainly.com/question/11209783

brainly.com/question/7132033

brainly.com/question/17249726

molarity:

brainly.com/question/9324116

brainly.com/question/10608366

brainly.com/question/7429224

#SPJ12

4 0
1 year ago
A chemical equation that does not indicate relative amounts of reactants and products is called
Zielflug [23.3K]

Answer:

The correct answer is skeleton equation.

Explanation:

In chemistry, the skeletal formula of a compound is an abbreviated representation of its molecular structure. Skeleton formulas are used because they clearly show complicated structures, they are fast and simple to draw.

All atoms that are not carbon or hydrogen are represented by their chemical symbol. The relative amounts of reagents and products are not indicated.

Have a nice day!

6 0
3 years ago
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