The density (mass/volume) of aluminum is 2.70x10^3 103 kilograms per cubic meter (kg/m3).
what is the mass of an aluminum cylinder that has a volume of 1.50 m3?

The definition of density is the mass per volume of the substance. This is an intrinsic property therefore the size (or any external feature) does not change this property.

For aluminum, it is given that it has a density of 2.70 x 10^3 kg/m^3.

The problem states that there is an aluminum substance having a volume of 1.50 m^3

Mass of aluminum = (1.50 m^3)( 2.70 x 10^3 kg/m^3) = 4050 kg 

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.