What is the volume in liters of 7500 g of helium atoms. assume stp conditions.

At STP (Standard Temperature and Pressure) there are 22.4 Liters in 1 mole.
Also there is 4g per every mole of Helium. You will use dimensional analysis to find the answer. You first start with grams, convert to moles, then convert moles to liters like so.

He = Helium

7500g He = 1 mole He = 1875 mole He
—————
4g He

1875 moles He = 22.4 L He = 42,000L He
—————
1 mole He

Answer should be 42,000 L of He

(Are you sure the question is 7,500 grams? Or does it say 75.00 grams?)

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