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klasskru [66]
2 years ago
6

In order to dilute 40.0 mL of 0.600 M HCl to 0.200 M, the volume of water that would need to be added would be 200 mL. 80.0 mL.

O 160 mL. 120 mL. 100 mL.​
Chemistry
1 answer:
aalyn [17]2 years ago
6 0

Answer:

80 ml

Explanation:

Moles to start =  .04 L * .6 M/L = .024 moles

   this is how much must be in the final dilution

         .2 moles / liter * x liter  = .024 moles

                x = .024 / .2 = .12   liter final volume

           start with   . 040    then add .080   to get .12 liter

  .080 liter = 80 ml

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The concentration of a biomolecule insdie a rod-shaped prokaryotic cell is 0.0051 M. Calculate the number of molecule inside the
Ann [662]

<u>Answer:</u> The number of molecules inside the cell are 2.2\times 10^6

<u>Explanation:</u>

We are given a prokaryotic cell, which is in the shape of rod or cylinder.

The equation used to calculate the volume of cylinder is:

V=\pi r^2h

where,

V = volume of cell = ?

r = radius of the celle = \frac{d}{2}=\frac{1.7\mu m}{2}=0.85\mu m=8.5\times 10^{-7}m     (Conversion factor: 1m=10^6\mu m )

h = length of the cell = 3.1\mu m=3.1\times 10^{-6}m

Putting values in above equation, we get:

V=(3.14)\times (8.5\times 10^{-7})^2\times 3.1\times 10^{-6}\\\\V=7.033\times 10^{-18}m^3

To calculate the number of moles for given molarity of solution, we use the equation:

\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}

Molarity of biomolecule = 0.0051 M

Volume of solution =  7.033\times 10^{-18}m^3=7.033\times 10^{-15}L     (Conversion factor:  1m^3=1000L )

Putting values in above equation, we get:

0.0051M=\frac{\text{Moles of biomoleculel}}{7.033\times 10^{-15}L}\\\\\text{Moles of biomolecule}=(0.0051mol/L\times 7.033\times 10^{-15}L)=3.59\times 10^{-17}mol

According to mole concept:

1 mole of a compound contains 6.022\times 10^{23} number of molecules

So, 3.59\times 10^{-17} moles of a biomolecule will contain = (3.59\times 10^{-17}\times 6.022\times 10^{23}=2.2\times 10^6 number of molecules

Hence, the number of molecules inside the cell are 2.2\times 10^6

5 0
3 years ago
A mixture of methane and carbon dioxide gases contains methane at a partial pressure of 431 mm Hg and carbon dioxide at a
KatRina [158]

Answer:

XCH₄ = 0.461

XCO₂ = 0.539

Explanation:

Step 1: Given data

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  • Partial pressure of carbon dioxide (pCO₂): 504 mmHg

Step 2: Calculate the total pressure in the container

We will sum both partial pressures.

P = pCH₄ + pCO₂

P = 431 mmHg + 504 mmHg = 935 mmHg

Step 3: Calculate the mole fraction of each gas

We will use the following expression.

Xi = pi / P

XCH₄ = pCH₄/P = 431 mmHg/935 mmHg = 0.461

XCO₂ = pCO₂/P = 504 mmHg/935 mmHg = 0.539

3 0
3 years ago
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Answer:

ph=150.0ml

Explanation:

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