How do you write a combustion reaction? Why is the oxygen on the reactant side never balance to the number of oxygens on the product side in a combustion equation?

Directions: Balance first the chemical equation below by multiplying the coeffícient to the number of atoms of each element. Then, multíply it by the atomic mass or weight. Please refer to the periodic table of elements in recording for the atomic mass or weight of the elements Involved. Besure that the total mass of the reactant is equal to the mass of the product. This is the balance equation: 2H2 02 2H20 H=4 H=4 O=2 O=2 H=4x1=D4 g/mol O=2x16=32 g/mol H=4x1=D4 g/mol O=2x16-32 g/mol 36 g/mol 36 g/mol

ABS plastic is a polymer consisting of three monomer units: acrylonitrile (C₃H₃N), butadiene (C₄H₆), and styrene (C₈H₈). A sample of ABS plastic contains 11.9% N by mass. It took 1.56 g of Br₂ to react completely with a 2.00 g sample of ABS plastic. Bromine reacts 1:1 (by moles) with the butadiene units in the polymer and nothing else, so bromination is a method for determining the quantity of butadiene in the polymer. What is the percent by mass of styrene in the polymer?

Write a balanced chemical equation based on the following description: aqueous iron(III) chloride reacts with aqueous ammonium sulfide to make aqueous ammonium chloride and solid iron(III) sulfide