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jmm0415 · May 22, 2009, 12:58 PM

There are 2.60 1015 short tons of oxygen in the atmosphere (1 short ton = 2000 lb). How many metric tons of oxygen are present (1 metric ton = 1000 kg)?

Perito · May 22, 2009, 02:06 PM

This is just a simple conversion.

$2.60\times\10^{15}\,short \,tons \, \times \, \frac {x\,metric\,tons}{y\,short\,tons}=2.60\times\10^{1 5}\,\times\,\frac xy\,metric\,tons$

So, where do you get the conversion factor? Let me google that for you.

PM0241891 · Jun 3, 2009, 09:05 AM

If I have 1g/ 30ml of a solution and I take out 5ml of that what is the concentration of the 5mL?

Perito · Jun 3, 2009, 11:15 AM

Originally Posted by PM0241891

If I have 1g/ 30ml of a solution and I take out 5ml of that what is the concentration of the 5mL?

Please post new questions in new threads.

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The concentration is a property of the solution as a whole. If the concentration is 1g/30 ml,

$\frac {1\,g}{30\,mL}=0.033333\,\frac {g}{mL}$

regardless of how much you took.

If the question what is the mass of material that was taken, then

$5\,mL\,\times\,\frac {1\,g}{30\,mL}=5\,mL\,\times\,0.033333\,\frac {g}{mL}= 0.166667\,g$