To find the enthalpy of a reaction in the lab, you measured the of the reactants

Mass and temperature 

By calculating the mass and the reactant as the specific heat and temperature changes.

Explanation:

The entropy is one of the thermodynamic properties of the system where the internal and is added to the product and the refers to the capacity to non-mechanical work and capacity to the release of the heat. And is expressed as the H → E + PV. and is the change of the internal energy and the plus the product of the constant.

Ctrust me i know its c

Sonar is an application of the doppler effect used by submarines.  this test was on k12.