why are assumptions made for calculating densities of all aqueous solutions and thier specific heats?

Question

how much of an impact the above assumption had on the final experimental value? thanks...

Answer 1

It makes calculations ever so much easier to assume that all solutions have a density of 1.0 g/cm3 and also a specific heat capacity of 4.2J/g/C.

The simple truth is that we are too lazy to find out what the densities and sp heat capacities actually are!