An empty water bottle is full of air at 15°c and standard pressure. the volume of the bottle is 0.500 liter. how many moles of air are in the bottle?

.0211

Explanation:

0.0211 moles of air are present inside the bottle

Explanation:

Volume of the bottle  = 0.500 L

Standard Pressure exerted by the air = 1 atm

Temperature of bottle in which air is present = 15 °C= 288 K(0 °C = 273 K)

Assuming air inside the bottle is behaving ideally:

PV=nRT

n = 0.0211 moles

0.0211 moles of air are present inside the bottle

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.