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15. Which sample of argon gas has the same number of atoms as a 100.-milliliter sample of helium gas at 1.0 atm and 300. K? A) 50. mL at 1.0 atm and 300. K (B) 50. mL at 0.5 atm and 300. K C) 100. mL at 0.5 atm and 300. K D) 100. mL at 1.0 atm and 300. K