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3 years ago

Identify the solute and solvent in a solution made from 15 mL of oxygen and 5 mL of helium.

Chemistry

1 answer:

Marina CMI [18]3 years ago

6 0

Answer:

Oxygen is solvent and Helium is solute.

Explanation:

Helium is a complety inert gas which do not react with other compounds whereas, oxygen can take part in chemical reaction with many compounds.

if we mix 15 mL of oxygen and 5mL of helium then the oxygen is the solvent and helium is solute.
In a mixture the compound with the greater volume is solvent and the compound with lwss volume is solute.
in this case, oxygen has greater volume than that of helium so oxygen is solute and helium is solvent here.

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When the mass of the boron atom is calculated, the mass of the electrons is ignored. Why is the mass of the electrons ignored?

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Because electron mass is so insignificant compared to proton and neutron mass that it can be ignored.

Explanation:

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3 years ago

A student is given 1.525 g of pure CuO. To recover the Cu present in the compound, the dark powdery solid was dissolved in 15.0

ikadub [295]

Answer:

The amount of Mg was enough

Explanation:

In this case, we have to start with the reaction between $Mg$ and $CuO$ , so:

$CuO~+~Mg~->~MgO~+~Cu$

If we check the reaction is already balanced. Now, we can do some stoichiometry to calculate the amount of Mg. The first step is the number of moles of $CuO$ . To this we have to calculate the molar mass of $CuO$ first, so:

Cu: 63.55 g/mol and O: 16 g/mol. So, (63.55+16)= 79.55 g/mol.

Now, we can calculate the moles:

$1.525~g~CuO\frac{1~mol~CuO}{79.55~g~CuO}=0.0192~mol~CuO$

The molar ratio between $Mg$ and $CuO$ is 1:1, so:

$0.0192~mol~CuO=0.0192~mol~Mg$ .

Now we can calculate the mass of Mg if we know the atomic mass of Mg (24.305 g/mol). So:

$0.0192~mol~Mg\frac{24.305~g~Mg}{1~mol~Mg}=0.466~g~Mg$

With this in mind, the student added enough Mg to recover all the Cu.

Note: The HCl doesn't take a role in the reaction. The function of HCl is to dissolve the $CuO$ .

I hope it helps!

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2 years ago

What factor can limit the buffering capacity of a molecule?

Bad White [126]

Answer:

The concentration and pKa of an acid and its conjugate base can limit the buffering capacity of a molecule.

Explanation:

A buffer is an acid and its conjugate base and the quality of it depends on its buffer capacity. This buffer capacity is the resistance to change the pH of the solution when strong acids or bases are added. The buffer capacity is related to the buffer concentration, the concentration of the acid end its conjugate base. Also, every acid has a pKa and the buffer capacity is at its maximum at the pKa value and can buffer the solution between ± 1 the pKa value.

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