Gas Law Stoichiometry

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

How do I move from grams to moles

• multiply by molar mass
• divide by molar mass
• multiply by Avo number
• divided by Avo number

How do I change from moles to liters?

• divide by 22.4
• multiple by Avo number
• multiply by 22.4
• multiply by molar mass

How many atoms are in a mole?

• 6.022x10^23
• 1
• Molar Mass
• 22.4

How many liters are in a mole?

• 6.022x10^23
• 1
• Molar Mass
• 22.4

How many grams are in a mole?

• 6.022x10^23
• 1
• Molar Mass
• 22.4

Mg₃N_2(s) + 3H₂O_(l) ––> 3 MgO + 2NH_3(g)
If 10.3 g of magnesium nitride is used, what volume of ammonia gas would be collected at 20˚C and 0.989 atm?

• 27.1 L H₂
• 4.96 L H₂
• 0.204 L H₂
• 10.3 L H₂

Tags

NGSS.HS-PS1-7

In the ideal gas law, _____ represents moles of a gas.

• T
• V
• R
• n

What is the molar mass of Mg(NO₃)₂

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

What is standard temperature?

• 0K
• 0^oC
• 173 K
• 173.15 K

Tags

NGSS.HS-PS3-4