What is the mass in grams of 1l of helium gas as stp find


What is the mass in grams of 1L of helium gas as STP? (Find moles and then convert moles to grams; atomic mass =4.0grams/mol) What is the mass in grams of 1 L of air at STP? (Air is 80% N2 and 20% O2, so the apparent molecular weight of air is 0.8 x 28 + 0.2 x 32=28.8g/mol) Why do helium balloons float? please show work

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Physics: What is the mass in grams of 1l of helium gas as stp find
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