2 C4H10 + 13 O2 + 8 CO2 + 10 H2O
Molecules

This reaction is combustion reaction

Explanation:

2 C4H10 + 13 O2 > 8 CO2 + 10 H2O

This reaction is combustion reaction which includes butane reaction with oxygen forming the carbon dioxide and water.

This is balanced stoichiometry reaction.

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.