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How many moles are equivalent to 55.5g of nano3

Acylinder is filled with 2.00 moles of nitrogen, 3.00 moles of argon and 5.00 moles of helium. if the gas mixture is at stp, what is the partial pressure of the argon

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form