Arock weighing 75.0g placed in a graduated cylinder displacing the volume from 31.4 ml to 36.5 ml what is density of the rock in grams/cubic centimeters?

the answer to your question is

ρ≅13.0⋅g⋅mL−1 = 13.0⋅g⋅cm−3Explanation:Density=Mass Per unit Volume = 75.0⋅g(36.5−31.4)⋅mL =??g⋅mL−1Note that 1⋅mL = 1⋅cm−3; these are equivalent units of volume; i.e. 1⋅cm3 = 1×(10−2⋅m)3=1×10−6⋅m3=10−3⋅L=1⋅mL.

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.