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**He STP Gas Calculations 1 mol 3.78 L He = 0.169 mol He 22.4 L**

One-step problems: A balloon is filled with 3.78 L of He gas at STP. How many moles of helium atoms are inside? He Solution: 1 mol 3.78 L He = mol He 22.4 L

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**CH4 STP Gas Calculations 22.4 L 5.99 mol CH4 = 134 L CH4 1 mol**

One-step problems: A balloon is filled with 5.99 moles of CH4 gas at STP. What is the volume of the balloon in liters? CH4 Solution: 22.4 L 5.99 mol CH4 = 134 L CH4 1 mol

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**Cl2 STP Gas Calculations 1 mol 36.2 L Cl2 = 1.62 mol Cl2 22.4 L**

One-step problems: A balloon is filled with 36.2 liters of Cl2 gas at STP. How many moles of chlorine gas are inside? Cl2 Solution: 1 mol 36.2 L Cl2 = 1.62 mol Cl2 22.4 L

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**Xe STP Gas Calculations 22.4 L 0.333 mol Xe = 7.46 L Xe 1 mol**

One-step problems: A balloon is filled with mol of Xe gas at STP. What is the liter volume of xenon in the balloon? Xe Solution: 22.4 L 0.333 mol Xe = 7.46 L Xe 1 mol

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**Ar STP Gas Calculations 39.948 g Ar 1 mol = 1.78 g/L Ar 1 mol 22.4 L**

One-step problems: A balloon is filled with argon gas at STP. What is the density of the gas in the balloon? Ar Solution: g Ar 1 mol = 1.78 g/L Ar 1 mol 22.4 L

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**? STP Gas Calculations 2.35 g gas 22.4 L = 52.6 g/mol 1 L 1 mol**

One-step problems: ? A balloon is filled with an unidentified gas at STP. If its density is 2.35 g/L, what is the molar mass of this gas? Solution: 2.35 g gas 22.4 L = 52.6 g/mol 1 L 1 mol

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**C2H2 STP Gas Calculations 26.038 g C2H2 1 mol = 1.16 g/L C2H2 1 mol**

One-step problems: A balloon is filled with acetylene gas at STP. What is the density of the gas in the balloon? C2H2 Solution: g C2H2 1 mol = 1.16 g/L C2H2 1 mol 22.4 L

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**What is the identity of this diatomic gas?**

STP Gas Calculations One-step problems: ? A balloon is filled with a diatomic gas at STP. If its density is g/L, what is the molar mass of this gas? What is the identity of this diatomic gas? Solution: Hydrogen H2 g gas 22.4 L = 2.02 g/mol 1 L 1 mol

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**He STP Gas Calculations Solution: Two-step problems:**

A balloon is filled with 300. liters of helium gas at STP. What is the mass in grams of this gas? Gas Vol mole Mass (g) Solution: 1 mol g He 300. L He = 53.6 g He 22.4 L 1 mol

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**N2 STP Gas Calculations Solution: Two-step problems:**

A balloon is filled with 122 grams of nitrogen gas at STP. What is the volume in liters of this balloon? Mass (g) mole Gas Vol Solution: 1 mol 22.4 L 122 g N2 = 97.6 L N2 g N2 1 mol

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**H2 STP Gas Calculations Solution: Two-step problems:**

A balloon is filled with 487 liters of hydrogen gas at STP. What is the mass in grams of this gas? H2 Gas Vol mole Mass (g) Solution: 1 mol g H2 487 L H2 = 43.8 g H2 22.4 L 1 mol

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**Ne STP Gas Calculations Solution: Two-step problems:**

A balloon is filled with 349 grams of neon gas at STP. What is the volume in liters of this balloon? Ne Mass (g) mole Gas Vol Solution: 1 mol 22.4 L 349 g Ne = 387 L Ne g Ne 1 mol

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**STP Gas Calculations Solution: Two-step problems: 1 mol 8250 L He**

Several balloons are filled with 8250 total liters of helium gas at STP. How many total atoms of helium are contained in all of the balloons? Gas Vol mole Atoms Solution: 1 mol 6.02x1023 atoms 8250 L He = 2.22x1026 atoms 22.4 L 1 mol

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**STP Gas Calculations Solution: Two-step problems: 1 mol 22.4 L**

A balloon in the shape of Darth Vader’s head is filled with 8.0x1028 molecules of nitrogen gas at STP. What is the volume in liters of this balloon? Solution: Molecules mole Gas Vol 1 mol 22.4 L 8.0x1028 molec. = 3.0x106 L N2 6.02x1023 molec. 1 mol

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**STP Gas Calculations Solution: Two-step problems: 1 mol 2.75 L CO2**

A sleeping balloon is filled with 2.75 liters of carbon dioxide gas at STP. How many molecules are contained the balloon? Gas Vol mole Molecules Solution: 1 mol 6.02x1023 molecules 2.75 L CO2 = 7.39x1022 molecules 22.4 L 1 mol

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**STP Gas Calculations Solution: Two-step problems:**

A large yellow ducky balloon is filled with 2.5x106 liters of air at STP. What is the mass in grams of the air if the average molar mass is 29 g/mol? Gas Vol mole Mass (g) Solution: 1 mol 29 g air 2.5x106 L air = 3.24x106 g air 22.4 L 1 mol

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**STP Gas Calculations Solution: Two-step problems:**

The Goodyear Blimp is filled with 5.74x106 liters of He at STP. What is the mass in grams of this much He? Gas Vol mole Mass (g) Solution: 1 mol g He 5.74x106 L He = 1.03x106 g He 22.4 L 1 mol

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**This sort of gives new meaning to the term “air head” doesn’t it?**

STP Gas Calculations Two-step problems: If the balloon at the left were filled with 4.5x1028 molecules of methane gas at STP instead of air, what would be the volume in liters? Solution: Molecules mole Gas Vol This sort of gives new meaning to the term “air head” doesn’t it? 1 mol 22.4 L 4.5x1028 molec. = 1.7x106 L CH4 6.02x1023 molec. 1 mol

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**STP Gas Calculations 64.064 g SO2 1 mol = 2.86 g/L SO2 1 mol 22.4 L**

One-step problems: If this flying cow balloon was filled with sulfur dioxide gas at STP instead of hot air, what would it’s density be? Solution: g SO2 1 mol = 2.86 g/L SO2 1 mol 22.4 L

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**STP Gas Calculations 1.85 g gas 22.4 L = 41.4 g/mol 1 L 1 mol**

One-step problems: If these balloons are filled with gas at STP and their density is 1.85 g/L, what is the molar mass of this gas? Solution: 1.85 g gas 22.4 L = 41.4 g/mol 1 L 1 mol

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**STP Gas Calculations Solution: Two-step problems: 1 mol 1.25 L CO2**

If this girl inhales all of the helium from this balloon that has a volume of 1.25 liters at STP, how many atoms does she inhale? Gas Vol mole Molecules Solution: 1 mol 6.02x1023 molecules 1.25 L CO2 = 3.36x1022 atoms of He 22.4 L 1 mol

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**STP Gas Calculations Solution: Two-step problems:**

If this girl’s balloon is filled with 4.0 liters of CO2 gas at STP and someone popped it with a pin, what mass in grams would be released? Gas Vol mole Mass (g) Solution: 1 mol g CO2 4.0 L CO2 = 7.86 g CO2 22.4 L 1 mol

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