The characteristics of a certain gas are listed in the table.
Characteristics of a Gas
Characteristic Description
Compound
Oxygen gas
Condition
STP
Mass
4.8 grams
What is the expected density of the above sample of gas?
O 1.90 g/L
O 1.82 g/L
O 1.56 g/L
O 1.43 g/L

1.56 g/L sample of gas in grams

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.

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