Practice cinis 38. A balloon contains 2.0 L of helium gas at STP. How many moles
helium are present?
39. How many moles of gas are present in 11.2 L at STP? How man
molecules?
10. What is the volume, at STP, of 3.45 mol of argon gas?
1. At STP, a container holds 14.01 g of nitrogen gas, 16.00 g of oxy
gas, 66.00 g of carbon dioxide gas, and 17.04 g of ammonia gas
is the volume of the container?
2. (a) What volume do 2.50 mol of oxygen occupy at STP?
(b) How many molecules are present in this volume of oxygen
Icl How many nxygen atoms are present in this volume of oxy​