Oxygen has a density of 1.43 g/l at stp. what is the density of oxygen at 1.30 atm?

Explanation:

It is given that pressure is 1.30 atm.

So, at STP temperature will be 273.15 K. And, according to the ideal gas equation:

                         PV = nRT ........ (1)

And,    Density =

or,               Volume = ....... (2)

Putting equation (2) is equation (1) we get the following.

                                 PV = nRT

Molar mass of oxygen is 32 g/mol. Now, putting the given values into the above equation to calculate density as follows.

                    Density =   g/L

                                  = 1.855 g/L

Thus, we can conclude that density of oxygen at 1.30 atm is 1.855 g/L.

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.