An advertiser needs 5000 helium-filled balloons for a special promotion. If each balloon has a volume of 7.5 L on a day when
- An advertiser needs 5000 helium-filled balloons for a special promotion. If each balloon has a volume of 7.5 L on a day when the temperature is 18"C and the atmospheric pressure is 102.7 kPa, calculate the mass of helium required.(M. = 4.0 g/mol )
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