Question

please help me fast

i will mark brainlist​

Answer 1

Answer:

let me in

Explanation:

Answer 2

Explanation:

Biogas is an emerging renewable energy source which is obtained through degradation of organic matter by bacteria under anaerobic conditions. Raw biogas contains about 55–65% methane (CH4), 30–45% carbon dioxide (CO2), traces of hydrogen sulphide (H,S), and fractions of water vapour (Stern et al., 1998). Pure methane has a calorific value of 9100 kcal/m3 at 15.5 °C and 1 atm. The calorific value of biogas varies from 4800 to 6900 kcal/m3.