When you exhale into a cold window pane, water vapor in your breath condenses on the glass. where does the water vapor come from?

Inside the lungs, condition is warm and wet. The warm air inside the lungs holds more moisture than cold air. Thus, exhaled air is warm and contains more moisture. Therefore, on breathing out on cold window pane, humid air loses heat get condensed on the cold window pane and the water vapor converted into water droplets.

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

-love shrooms