Holooly Plus Logo
Holooly Plus Logo

Question 1.1.1: Calculate the weight and volume of air required for the comb......

Calculate the weight and volume of air required for the combustion of 3 kg of carbon.

Step-by-Step
The 'Blue Check Mark' means that this solution was answered by an expert.
Learn more on how do we answer questions.
Report Answer

Combustion reaction

C \quad + \quad O_2 \rightarrow CO_2 \\12  kg \quad 32  kg

Weight of oxygen required to burn 12 kg C = 32 kg

Weight of oxygen required to burn 3 kg     C =\frac{32}{12} × 3 = 8 ~kg

As, air contains 23% oxygen by weight

Therefore, weight of air required = 8 × \frac{100}{23}= 34.783 ~kg = 34783 ~g

Volume of air required

as, 1 mole of any gas at STP occupies 22.4 L

Therefore, volume occupied by 1 mole air = 28.94 g air = 22.4 L

(molecular weight of air = 28.94 g)

\begin{aligned}\text{Volume occupied by 34783 g of air}=  & \frac{22.4}{28.94}  × 34783\\ \\=  & 26.92 × 10^3 ~L = 26.92  m^3\\  &  (\text{Since}  1 ~L = 10^3 ~m^3)\end{aligned}

Related Answered Questions

Question: 1.2.4

A gaseous fuel has the following composition by volume – CH4 = 4.0%; CO = 26%; CO2 = 10%; H2 = 10%; N2= 50%. If 20% excess air is supplied calculate the volume of air supplied and the % composition of dry flue gases. ...

Verified Answer:

Minimum volume of air required = 0.260 × \f...
Question: 1.2.3

A gaseous fuel has the following composition by volume – CH4 = 20%; CO = 10%; CO2 = 5%; O2 = 2%; C2H4 = 5%; C3H8 = 8%, rest N2.Calculate the volume of air supplied per m³ of fuel and the % composition of dry flue gases. ...

Verified Answer:

Volume of air required for the combustion of 1 m³ ...
Question: 1.2.2

A given sample of petrol contains H = 15.4% and C = 84.6%. Calculate the minimum volume of O2 required for the combustion of this sample. ...

Verified Answer:

\begin{aligned}\text{Weight of}  O_2  \text...
Question: 1.2.1

A gas used in internal combustion engine had the following composition by volume : H2 = 45%; CH4 = 36%; CO = 15%; N2 = 4%. Find the volume of air required for the combustion of 1 m³ of the gas. ...

Verified Answer:

\begin{aligned}\text{Therefore volume of ai...
Question: 1.1.4

A fuel is found to contain C = 90%; H = 6.0%; S = 2.5%; O = 1.0% and ash = 0.5%. Calculate the amount of air required for complete combustion of 1 kg of fuel. If 25% excess air is used for combustion, calculate the percentage composition of the dry products of combustion. ...

Verified Answer:

\begin{aligned} O_2  \text{required from ai...
Question: 1.1.3

A sample of coal was found to have the following composition by weight C = 75%; H = 5.2%; O = 12.1%; N = 3.2% and ash = 4.5% Calculate (i) minimum amount of O2 and air necessary for complete combustion of 1 kg of coal; (ii) weight of air required if 40% excess air is supplied. ...

Verified Answer:

\begin{aligned}O_2  \text{required from air...
Question: 1.1.2

Calculate the mass of air needed for the complete combustion of 5 kg of coal containing C = 80%; H = 15%, O = rest ...

Verified Answer:

\begin{aligned} \text{Oxygen required from ...
Question: 1.7.2.4

1.56 g of a coal sample was Kjehldahlised and NH3 gas thus evolved was absorbed in 50 mL of 0.1 N H2SO4. After absorption, the excess (residual) acid required 6.25 mL of 0.1 N NaOH for exact neutralisation. Calculate the percentage of nitrogen in the coal sample. ...

Verified Answer:

Weight of coal sample taken = 1.56 g Since 6.25 mL...
Question: 1.7.2.3

0.3 g of coal sample on Kjehldahl’s analysis gave ammonia to just neutralise 30 mL of 0.1 N H2SO4. Calculate the percentage of nitrogen in the coal sample. ...

Verified Answer:

Weight of coal sample = 0.3 g Volume of H_{...
Question: 1.7.2.2

1.0 g of a coal sample was used in a bomb calorimeter for the determination of calorific value. Calorific value of coal was found to be 8800 cal/g. The ash formed in the bomb calorimeter was extracted with acid and the acid extract was heated with BaCl2 solution and a precipitate of BaSO4 was ...

Verified Answer:

Percentage of sulphur = \frac{ weight  of  ...