Question

The volume of '1.4ℓ' gas obtained at STP on heating '5.6ℓ' is (molar mass of '1.12 e' '11.2ℓ' O '2NaHCO_(3)longrightarrow^(/_\)Na_(2)CO_(3)+H_(2)O+CO_(2)' O 'NaHCO_(3)=84" "g//mol' O '8.4" "gNaHCO_(3)' 'CO_(2

Answer 1

Answer:

Gas stoichiometry is the study of the relative amounts of reactants and products in reactions that involve gases.

EXAMPLE

Calculate the volume of gaseous NO₂ produced by the combustion of 100 g of NH₃ at 0°C and 100 kPa.

Solution

Step 1. Write the balanced chemical equation.

4NH₃(g) + 7O₂(g) → 4NO₂(g) + 6H₂O(l)

Step 2. Convert mass of NH₃ → moles of NH₃ → moles of NO₂.

100 g NH₃ ×  

1

mol NH

3

17.03

g NH

3

×

4

mol NO

2

4

mol NH

3

= 5.872 mol NH₃ (3 significant figures +

1 guard digit)

Step 3. Use the Ideal Gas Law to calculate the volume of NO₂.

P

V

=

n

R

T

V

=

n

R

T

P

=

5.872

mol

×

8.314

kPa⋅L⋅K

−

1

mol

−

1

×

273

K

100

kPa

= 133 L

Explanation: