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3 years ago

What are the common units for expressing solution concentration?

2 answers:

6 0

It would be mol/dm^3 Formula of concentration: (no. of moles/volume of solution in dm^3) 1 cm^3 = 0.001dm^3 Hope this helped. :)

tamaranim1 [39]3 years ago

3 0

Molarity and molality is widely used as units for expressing concentration. Concentrations can also be show through mass per univ volume. Another example is by parts such as parts per million and parts per billion. Lastly, it can also be expressed through percent by mass or volume.

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Two samples of the same compound are compared. what does the data represent? sample 1: 24.22 g carbon and 32.00 g oxygen sample

goblinko [34]

According to law of definite proportion:

In a compound, elements are always arranged in fixed ratio by mass.

Here, sample 1 has 23.22 g Carbon and 32.00 g Oxygen.

Converting mass into number of moles:

Molar mass of carbon is 12 g/mol and that of oxygen is 16 g/mol thus,

$n_{C}=\frac{m_{C}}{M_{C}}=\frac{24.22 g}{12 g/mol}\approx 2 mol$

Similarly, number of moles of oxygen will be:

$n_{O}=\frac{m_{O}}{M_{O}}=\frac{32 g}{16 g/mol}=2 mol$

The ratio of number of moles of carbon and oxygen will be:

$C:O=n_{C}:n_{O}=2:2=1:1$

Therefore, formula of compound will be CO.

Sample 2:

It has 36.22 g Carbon and 48.00 g Oxygen.

Converting mass into number of moles:

Molar mass of carbon is 12 g/mol and that of oxygen is 16 g/mol thus,

$n_{C}=\frac{m_{C}}{M_{C}}=\frac{36.22 g}{12 g/mol}\approx 3 mol$

Similarly, number of moles of oxygen will be:

$n_{O}=\frac{m_{O}}{M_{O}}=\frac{48 g}{16 g/mol}=3 mol$

The ratio of number of moles of carbon and oxygen will be:

$C:O=n_{C}:n_{O}=3:3=1:1$

The formula of compound will be CO.

Therefore, it is proved that carbon and oxygen are present in fixed ratios in both the samples.

4 0

3 years ago

A sample of propane, C3H8, contains 14.6 moles of carbon atoms. How many total moles of atoms does the sample contain

seraphim [82]

Answer:

161 atoms

Explanation:

A sample of propane, C3H8, contains 14.6 moles of carbon atoms. How many total moles of atoms does the sample contain

every molecule of propane contains 3+8=11 atoms

14.6 moles contain 14.6 X 11 = 161 atoms

4 0

3 years ago

What is the density if<br> a sample of rock has a mass of 69<br> g and a volume of<br> 23<br> ml?

kiruha [24]

Density = mass / volume

= 69g / 23 ml

= 3 g / ml.

Thus, the density of the sample is 3 grams per ml or 3g/ ml

4 0

4 years ago

Read 2 more answers

Na+l2 Nal balance chemical equation

Nesterboy [21]

Answer:

2Na + L2 = 2NaL

Explanation:

4 0

3 years ago

Read 2 more answers

What are the 3 things that should be remembered while writing a chemical reaction?

stich3 [128]

Answer:

They are as follows:

Complete information about reactants and products, e.g. number of molecules, mass, etc.
Physical states of substances.
Necessary conditions for chemical equation, e.g temperature, pressure, catalyst, etc.
Equation also shows if the reaction is exothermic or endothermic.

Explanation:

I hope it'll help you...

4 0

3 years ago