Question

Help please! i understand the basics just need to confirm i’m right!

Answer 1

Last option --> V = 9.96 L

Step-by-step explanation

Given

A balanced chemical equation

`6NO\text{ + 4NH}_3\rightarrow\text{ 5N}_2+6H_2O`

Mass of NO = 20.0 g

at STP: Pressure = 1 atm, temperature = 273 K

Required: Volume of NH3 gas

Solution

Step 1: Find the moles of NO

n = m/M where n is the moles, m is the mass and M is the molar mass

n = 20.0 g/30,01 g/mol

n = 0.666 mol

Step 2: Use stoichiometry to calculate the moles of NH3

The molar ratio between NO and NH3 is 6:4

Therefore the moles of NH3 = 0.666 x (4/6) = 0.444 mol

Step 3: Calculate the volume of NH3

PV = nRT

Re-arrange to solve for V

V = nRT/P

V = (0.444 mol x 0.0821 L.atm/K.mol x 273 K)/1 atm

V = 9.96 L