The mole fraction of neon in the air is about 2.6 x 10–5. If the average molar mass of air is 28.96 g/mol what is the concentration of neon in air in ppm?

The concentration of neon in air is 18.14 ppm

Explanation:

We are given:

Mole fraction of neon =

This means that moles of neon are present

To calculate the number of moles, we use the equation:

Molar mass of neon = 20.2 g/mol

Moles of neon = moles

Putting values in above equation, we get:

ppm is the amount of solute (in milligrams) present in kilogram of a solvent. It is also known as parts-per million.

To calculate the ppm of oxygen in sea water, we use the equation:

Both the masses are in grams.

We are given:

Mass of neon  =

Mass of solution (air) = 28.96 g

Putting values in above equation, we get:

Hence, the concentration of neon in air is 18.14 ppm

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

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