Consider an enclosed space with a volume of 12 m X 12 m x 4m that has 30 persons smoking two cigarettes every hour. One of the gases coming out of the cigarettes is formaldehyde, and each cigarette may be assumed to emit 1.35 mg formaldehyde. Conversion of formaldehyde to carbon dioxide can be assumed to be first order, and the rate of the reaction is 0.40 per hour. Outside (fresh) air enters the enclosed space at the rate of 800 m^3 per hour. Assume the smoke becomes completely mixed with air and this smoke-mixed air leaves the enclosed space at the same rate that the fresh air enters. What is the concentration of formaldehyde, in mg/m^3, in the room air at steady state

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.