[gotme?]

i need some help
im takin ch 101 (general chem)
this is the problem:
During the summertime in Atlanta, the jet stream moves north towards Canada, and the atmosphere often stagnates. Weather forecasters give daily ozone warnings to the elderly and to people with asthma because ozone build-up in the air is harmful. Typically, an adult will in hale 2.1 liters of air per breath. What mass of ozone in micrograms is taken into the lungs per breath by an adult breathing air containing 3.64 x 10 to the negative 4 micrograms of ozone per cubic centimeter of air?

i got .7644 micrograms
my teacher said im missing a step

can anyone help?

[macman104]

Can you walk us through your calculations, it makes it much easier for people to help see what might be the problem.

[Borek]

Problem is, I can't see a problem :/

[gotme?]

2.1 L *1000  = 2100 cm^3
3.64*2100 = 7644 *10^-4
my teacher said something about think about when i inhale

[Borek]

Significant digits perhaps?