Question

Find the volume of 85 g of NH3 at STP.

• A. 112L
• B. 224L
• C. 22.4L
• D. 11.2L

Answer 1

Answer:

A. 112L

• Molar mass of ammonia ($\text{NH}_3$)=14+3 X1 =17g/mol

• Number of moles in 85 g of NH₃=Mass/molar mass=85g/17g/mol=5 moles

• Since 1 mole of any ideal gas occupies 22.4 L at STP, the total volume is:5moles x 22.4 L/mol=112L