A36 gram sample contains 28 grams of fe and 8 grams of oxygen. determine the percent composition for each of the elements.

The sample contains both Fe and oxygen

The mass of the sample is 36 g

28 g are Fe and 8 g are O

So to find the percent composition we can calculate using the following formula

Percent composition of the element = mass of the element / mass of the sample x 100%

Percent composition of Fe = 28 g / 36 g x 100 % = 77.8%

Percent composition of O = 8 g / 36 g x 100 % = 22.2%

The percentage composition for each of the elements is

Fe =77.8 % oxygen= 22.2%

calculation

% composition = mass of the element/total mass x100

total mass = 36g

The % composition of Fe = 28/36 x100 = 77.8%

The % composition of oxygen = 8/36 x100 = 22.2%

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.