The element gold has a consistent melting point and color regardless of the physical
changes that it goes through. This identifies gold as what type of substance?

A. A mixture
B. A compound
C. A pure substance
D. A physical property

4.25g sample of solid ammonium nitrate dissolves in 60.0g of water in a coffee-cup calorimeter, the temperature drops from 22.0 c to 16.9 c. assume that the specific heat of the solution is the same as that of pure water. calculate delta(h) (in kj/mol nh4no3) for the solution proces.