Chemistry Mass Percent of a solution..NEED HELP DUE in 2 Hours

Sbljml

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12 years ago

Chemistry Mass Percent of a solution..NEED HELP DUE in 2 Hours

A water sample from the botton of Lake Nyos contains 8.5% of carbon dioxide by mass. Determine how much carbon dioxide in grams is contained in 28.6 L of the water solution.

I know I have 8.5% of CO2 by Mass, 28.6 L of solution, and need to find the g of CO2.

The sample shows that the density= 1.03 g/ml.

How did they get the denisty?

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jteague44

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12 years ago

Since gases are mostly empty space, the densities of gases are reported in g/L, not g/mL as found for solids and liquids. As you’re probably aware, density is equal to mass per unit of volume. To calculate the density of a gas at standard temperature and pressure, you take the molecular formula weight of the gas (grams per mole—from the periodic table) and divide that by the standard molar volume for a gas, which is 22.4 L per mole:

where the formula weight (FW) is in g/mol, and the standard molar volume is 22.4 L/mol.

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khushi

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12 years ago

you need to use the density formula to solve this problem. D=M/V (M = Mass and V = Volume) Since you are given percentage of CO2 you need to multiple by the molecular weight of CO2 which is 44 by 8.5%. This would be your mass of CO2. Then simply divide this number by volume given. This would give you the answer.

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Sbljml Author

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12 years ago

The sample problem tells me that the density is 1.03 g/mL and I have no idea how to get to that.

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