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andreev551 [17]
3 years ago
6

The diagram below represents the organizational levels of living things.

Chemistry
2 answers:
nataly862011 [7]3 years ago
4 0

Answer: It’s blood

Explanation:

I did the quiz

Tasya [4]3 years ago
3 0

Answer: its vein

Explanation:

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Calculate the pH of a buffer that is 0.13 M in lactic acid and 0.11 M in sodium lactate
Gelneren [198K]
Acidity of lactic acid = pKa = 3.85
Ca = 0.13M
Cs = 0.11M
<span>Henderson-Hasselbalch equation:</span>
pH = pKa + log(Cs/Ca)
pH = 3.85 + log(0.11M/0.13M) = 3.85 + log0,846 = 3.85 - 0.073 = <u>3.777</u>
5 0
3 years ago
15.0 mL of 0.200 M barium chloride solution is mixed with a silver nitrate solution. What mass of silver chloride will be formed
Flauer [41]
15ml+28l=43ml hope this helps
4 0
3 years ago
Xenon tetrafluoride gas is placed in a 3 liter container at 80 degrees Celsius. The pressure of the gas is found to be 0.117 atm
cupoosta [38]
PV = nRT
n = PV/RT
n = (.117)(3)/(.0821)(273+80)
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3 0
3 years ago
How many milliliters of water are needed to prepare a 3.5M solution of NaOH if you have .5mol of the solute
Mamont248 [21]

Answer:

1335.12 mL of H2O

Explanation:

To calculate the mililiters of water that the solution needs, it is necessary to know that the volume of the solution is equal to the volume of the solute (NaOH) plus the volume of the solvent (H2O).

From the molarity formula we can first calculate the volume of the solution:

M=\frac{solute moles}{solution volume}

Solutionvolume=\frac{solute moles}{M} =\frac{5mol}{3.5\frac{mol}{L} } =1.429L

The volume of the solution as we said previously is:

Solution volume = solute volume + solvent volume

To determine the volume of the solute we first obtain the grams of NaOH through the molecular weight formula:

MW=\frac{mass}{mol}

Mass=MW*mol=39.997\frac{g}{mol} *5mol=199.985g

Now with the density of NaOH the milliliters of solute can be determined:

d=\frac{mass}{volume}

Volume=\frac{mass}{d} =\frac{199.985g}{2.13\frac{g}{mL} } =93.88mL of NaOH

Having the volume of the solution and the volume of the solute, the volume of the solvent H2O can be calculated:

Solvent volume = solution volume - solute volume

Solvent volume = 1429 mL -  93.88 mL = 1335.12 mL of H2O

7 0
4 years ago
Give formula for iron (III) oxide​
Paraphin [41]

Answer:

Fe2O3

Explanation:

6 0
3 years ago
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