volume and density problem

[svtec]

Here is the problem:

An auditorium measures 40.0m X 20.0m X 12.0m. the density of the air is 1.20kg/m^3.

a) what is the volume in cubic ft?

b) the weight of the air in the room in pounds.

for a) i have some big answer. 339020 ft^3. using V=l*w*h and then using basic dimensional analysis to convert from cubic meters to cubic ft. (my answer in metric was 9600m^3.

for b) i have no clue how to convert a density to a weight.[:((]

any pointers or suggestions would be great.

TIA...

-andrew

[himanshu121]

Multiply Density with Volume to get the weight in Kg , and do the conversion into pounds.

[svtec]

thanks for the help.

that was a total rookie mistake that i made.

<------ is done with calculus, but cannot manipulate a simple equation.[:D]