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3 years ago

What is the purpose of the solvent in chromatography?

Chemistry

1 answer:

prisoha [69]3 years ago

5 0

Solid substances cannot raise to the top of the ‘card’. They need to be in liquid form.

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What is the mass of 16.3 l of helium gas?

erma4kov [3.2K]

4.003 is the mass of helium gas

5 0

3 years ago

in the laboratory a student dilute 13.3 ml of a 10.8 m hcl solution to a total of 300.0 ml what is the concentration of the dilu

krek1111 [17]

<u>Answer:</u> The concentration of the diluted solution is 0.4788M

<u>Explanation:</u>

To calculate the concentration of the diluted solution, we use the following equation:

$M_1V_1=M_2V_2$

where,

$M_1\text{ and }V_1$ are the molarity and volume of HCl solution

$M_2\text{ and }V_2$ are the molarity and volume of the diluted HCl solution.

We are given:

$M_1=10.8M\\V_1=13.3mL\\M_2=?M\\V_2=300mL$

Putting values in above equation, we get:

$10.8\times 13.3=M_2\times 300\\\\M_1=0.4788M$

Hence, the concentration of the diluted solution is 0.4788M

6 0

3 years ago

The only metal that exists as a liquid at room temperature is

babymother [125]

Answer:

Mercury

Explanation:

This is the only metal that exists as a liquid at room temperature

5 0

3 years ago

Compare 1 mole of H2, 1 mole of O2 and 1 mole of F2

likoan [24]

Explanation:

(a) As per the mole concept, one mole of any atom contains $6.022 \times 10^{23}$ atoms or molecules, that is, Avogadro's number of atoms.

Therefore, 1 mole of $H_{2}$ = $2 \times 6.022 \times 10^{23}$ molecules

= $1.2044 \times 10^{23}$ molecules

1 mole of $O_{2}$ = $2 \times 6.022 \times 10^{23}$ molecules

= $1.2044 \times 10^{23}$ molecules

1 mole of $F_{2}$ = $2 \times 6.022 \times 10^{23}$ molecules

= $1.2044 \times 10^{23}$ molecules

Hence, there are equal number of molecules present in the given atoms.

(b) Mass of each given atom will be calculated as follows.

Mass = no. of moles × molar mass

As one molecule of $H_{2}$ contains 2 atoms of hydrogen.

So, mass of 1 mole of $H_{2}$ = $2 mol \times 1.008 g/mol$

= 2.016 g

mass of 1 mole of $O_{2}$ = $2 mol \times 15.999 g/mol$

= 31.996 g

mass of 1 mole of $F_{2}$ = $2 mol \times 18.998 g/mol$

= 37.996 g

Thus, we can conclude that $F_{2}$ has the greatest mass.

8 0

4 years ago

Explain why fossil fuels are exhaustible natural resources

zloy xaker [14]

Answer:

Fossil Fuels are exhaustible natural resources, because they can't be renewed. Once these fuels are used up, there are NONE left! We can change that by reducing the amount we use. It takes millions of years for it to be remade, and we will soon die out before that happens. Thats why fossil fuels are exhaustible. :)

Explanation:

Hope this helps! :)

7 0

3 years ago