Posted by **Shelby** on Sunday, September 23, 2012 at 12:37pm.

The density of dry air measured at 25 degrees Celsius is 1.19x10 to the negative 3rd power. What is the volume of 50.0g of air?

- Chemistry -
**DrBob222**, Sunday, September 23, 2012 at 12:42pm
mass = volume x density.

Substitute for mass and density; solve for volume. Make sure the units of density (you don't list that) agrees with the unit you want in the answer.

- Chemistry -
**Shelby**, Sunday, September 23, 2012 at 12:49pm
can u explain that a little more because i still dont understand

- Chemistry -
**DrBob222**, Sunday, September 23, 2012 at 1:29pm
There isn't anything to explain.

mass = volume x density. That's the formula. That's it. End of story. You read the problem, substitute the numbers, solve the equation.

mass in the problem = 50g

density in the problem = 1.19E-3. You don't list the units. I will assume for purposes of showing you that this is 1.18E-3 g/mL. If it is some other unit you will need to adjust that.

Substitute.

mass = volume x density

50 = volume(in mL) x 1.19E-3 g/mL

volume = 50/1.19E-3 = about 42000 mL.

If you will explain what trouble you are having perhaps I can focus on a better answer.

- Chemistry -
**hi**, Tuesday, March 31, 2015 at 1:29pm
50/.00119=42016.8067227mL>>then you have to round to 2 significant digits b/c 50 has 2 sig figs which is the least # of sig figs

- Chemistry -
**hi**, Tuesday, March 31, 2015 at 1:30pm
50/.00119=42016.8067227mL>>then you have to round to 2 significant digits b/c 50 has 2 sig figs which is the least # of sig figs, so its 42,000mL

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