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Seawater at 15°C contains 9.4 mg/L of molecular oxygen. What molarity is this?

Question

Seawater at 15°C contains 9.4 mg/L of molecular oxygen. What molarity is this?

check_circleAnswer
Step 1

The number of moles of a given chemical species is defined as the ratio of mass to the molar mass of the substance. The mathematical formula is as shown below:

Mass
Number of moles=
Molar mass
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Mass Number of moles= Molar mass

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Step 2

The term molarity or concentration for a given solution is defined as the ratio of number of moles to the volume of the solution (in liters). Its SI units are moles/liter.

Step 3

From the mole concept, it is well known that 1 mole of oxygen contains 32 g of oxygen.

This means that 32 ...

1
-x9.4 x10 moles of oxygen
32
9.4 x10 g of oxygen ->
X
0.00029375 moles of oxygen
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1 -x9.4 x10 moles of oxygen 32 9.4 x10 g of oxygen -> X 0.00029375 moles of oxygen

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