The density of air is 0.0013 g/cm^3 . What is the mass of 200cm^3 of air ?
( I dont know that's mean find Mass or find Volume ?
Show work please .

Question

The density of air is 0.0013 g/cm^3 . What is the mass of 200cm^3 of air ? 
( I dont know that's mean find Mass or find Volume ?
Show work please .

anonymous · Answer

Let's just rewrite this slightly.  Air costs 0.0013 dollars/cm^3.  What would it cost to buy 200 cm^3 of air?  Can you do that problem?

anonymous · Answer

0.0013 x 200 ?

anonymous · Answer

Why the question mark?  Are you not sure?

anonymous · Answer

i'm little bit confused about my problem :))

anonymous · Answer

Pretend it's a game show.  For ONE MILLION DOLLARS, lin.  The supermarket is selling air at 13 cents per cubic centimeter.  What will it cost to buy 200 cubic cenimeters of air????

tick tock tick tock tick tock...

anonymous · Answer

2600 dollars

anonymous · Answer

Yay!!!! 

The audience goes wild....!

anonymous · Answer

kay, go back to my problem ...plz

anonymous · Answer

So, here's the nifty thing: you KNOW how to do this problem, don't you?  It's just the words that are confusing.  Instead of "price" you've got this thing called "density."  The trick is just to mentally translate, every time you see "density" to "price," because you understand price intuitively.

That's all density is, a price.  Granted, what you're "buying" is measured in cm^3, instead of pounds or quarters or liters.  And the "total cost" is measured in grams, instead of dollars.  But otherwise the idea and how you calculate things are just the same.

anonymous · Answer

0.26 is correct?

anonymous · Answer

Again, why the question mark?  Aren't you sure of your reasoning?  You didn't hesitate with the game show...

anonymous · Answer

i did wrong in my test , i did it equal 0.26 , and get wronggg

anonymous · Answer

Ah so.  Well, who's right?  It's certainly possible for your instructor to make a mistake, although it's less likely than you doing so.  You KNOW how to do this problem.  If a checkout clerk at the supermarket charged you something other than $0.26 for 200 pounds of bananas at $0.0013/lb, would you just go home?  Or would you demand to see the manager, explain in forceful detail why you're right?

The thing you should be careful about, however, is that you were marked wrong for the numerical part of your answer -- for the 0.26. Maybe you made some other mistake!  Maybe you forgot the unit, or wrote it wrong. Maybe you did something unpermitted with the significant digits.  Maybe you scribbled and your ".26" looks like "26".  Are you certain you were marked wrong for your 0.26?

anonymous · Answer

And what if both you and I are wrong, now?  That's possible, too.  Can you prove to me that the right answer is 0.26 g?