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4 years ago

Show me an atomic chart for isotope Ni-54

Chemistry

1 answer:

12345 [234]4 years ago

8 0

The atomic symbol for Ni-54 is $_{28} ^{26} Ni$ .

Ni has atomic number 28, so the atomic symbol is $_{28} ^{26} Ni$ .

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Why do atoms form molecules and compounds?

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It is more energetically stable to do that. Nature prefers to have a low energy state. If you go somewhere in nature you will usually find a low energy state object or material.

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3 years ago

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What do hydrologists primarily study? O A. Stars O B. Rocks O c. Water O D. Weather

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Hydrologists primarily study water, i think

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3 years ago

A 0.2436-g sample of an unknown substance was dissolved in 20.0 ml of cyclohexane. The density of cyclohexane is 0.779 g/ml. The

Viktor [21]

The depression in freezing point is related to molality of solution as follows:

$\Delta T_{f}=k_{f}m$

Here, $k_{f}$ is freezing point depression constant, for cyclohexane it is equal to 20°C kg/mol.

The value of freezing-point depression is 2.5 °C, molality can be calculated as follows:

$m=\frac{\Delta T_{f}}{k_{f}}=\frac{2.5 ^{o}C}{20 ^{o}C kg/mol}=0.125 mol/kg$

Molality is defined as number of moles of solute in 1 kg of solvent.

Here, solvent is cyclohexane, its volume is given 20.0 mL and density is 0.779 g/mol thus, mass of cyclohexane can be calculated as follows:

$m=d\times V=0.779 g/mL\times 20 mL=15.58 g$

Converting this into kg,

$1 g=10^{-3} kg$

Thus, 15.58 g will be 0.01558 kg.

Now, number of moles of unknown solute is related to its mass and molar mass as follows:

$n=\frac{m}{M}$

Putting the values of mass of solute which is 0.2436 or 0.0002436 kg

$n=\frac{ 0.0002436 kg}{M}$

Now, expression for molality of solution is:

$m=\frac{n_{solute}}{m_{solvent}}$

Putting all the values,

$0.125 mol/kg=\frac{0.0002436 kg}{M\times 0.01558 kg}$

Or,

$0.125 mol/kg=\frac{0.015635}{M}$

On rearranging,

$M=\frac{0.015635}{0.125 mol/kg}=0.1250 kg/mol$

Or,

$M=0.125 kg/mol(\frac{1000 g}{1 kg})=125 g/mol$

Therefore, molar mass of unknown sample is 125 g/mol

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4 years ago

Which element would you expect to be more reactive: phosphorus (P) or fluorine (F)

Studentka2010 [4]

Answer:

Fluorine

Explanation:

Fluorine is the most electronegative element because it has 5 electrons in it's 2P shell.

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3 years ago

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How many mL of 0.25 M NaOH would have 0.18 moles of NaOH?

8_murik_8 [283]

Answer:

720 mL

Explanation:

To answer this problem we'll use the definition of molarity:

Molarity = moles / liters

With that in mind we can calculate the volume in liters:

0.25 M = 0.18 moles / liters

liters = 0.72 L

Finally we convert liters to mL:

0.72 L * 1000 = 720 mL

Thus 720 mL of 0.25 M NaOH would have 0.18 moles of NaOH.

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3 years ago