[klee256]

Let's say that you have an aqueous solution of HCl, and its density is 1.0745 kg/L.
Is it wrong to say that since the density of water is 1 kg/L, the density of the HCl in the solution should be .0745 kg/L?

[AWK]

Wrong.
You can tell about concnetrations in different units (%, molar, molal, mole fraction)

24.0 % ammonia  - density 0.910 kg/L - what is your interpretation in this case?

[docnet]

The density of HCL would be calculated by dividing the mass of the HCl by the volume it occupies.

Under those circumstances you could only make a qualitative deduction that HCl is more dense than water. You would need to be given more information such as volume of HCl when asked figure out the density of the HCl.

Density of the solution, density of HCl, and density of Water are three different things. HCl and water are miscible so I don't know how it would retain the same density when combined with water.



 

[Borek]

HCl and water are miscible

Liquid HCl boils at -85°C, at this temperature water is a solid. How are you going to mix them?

My bet is that you are mistaking HCl solution with the HCl itself.

[docnet]

Right...! I forgot that HCl exists in room temperature in the gas state. 

[Enthalpy]

[...]since the density of water is 1 kg/L [...]

There can be less than 1kg water in this litre of solution.
Also - though this wasn't in the question - don't try to add volumes. Especially for H₂O and HCl, it must be very wrong.