Gases at STP

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium with excfess water according to the following reaction?
1Mg + 2H₂O --> Mg(OH)₂ + H₂

• 62L
• 65L
• 31L
• 124L

How many liters are in a mole?

• 6.022x10^23
• 1
• Molar Mass
• 22.4

What is standard temperature?

• 0K
• 0^oC
• 173 K
• 173.15 K

What is the molar volume of an ideal gas at STP?

• 1 mol = 22.4 L
• 1 mol = 0.0821 L
• 1 mol = 1 L
• 1 mol = 273 L

What is the volume of 2 moles of gas at STP?

• 22.4 L
• 44.8 L
• 11.2 L
• 2 L

2Al + 6HCl --> 2AlCl₃ + 3H₂

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

• 13

• 8.8

• 0.99

• 1.0

At STP, 2.5 moles of helium gas will have what volume?

• 9 L

• 56 L

• 27 L

• 72 L

An average breath contains 500 mL of gas. Assuming the air is an ideal gas at STP, how many moles of air are pushed out with each breath?

• 0.022 moles

• 22 moles

• 0.22 moles

• 2.2 moles

What is the molar mass of Mg(NO₃)₂

• 148.313g/mol
• 134.306g/mol
• 54.311g/mol

Which of the following is a value for standard pressure?

• 1000 kPa

• 765 mm Hg

• 1 atm

• 5 torr