The mass of helium gas in a balloon is . the weight of the gas minus the balloon
the amount of matter inside the balloon
the amount of matter including the balloon
the mass of helium minus the mass of the balloon

The amount of matter inside the balloon.

Explanation:

4.00 g/mol

Helium, which has a mass of 4.00 g/mol, has a density of 0.164 g/l. Thus, a one-liter balloon of helium can lift a mass of (1.18-0.164) = 1.02 g.

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explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.