[Davros]

Gee, this takes me back many a year :
OK, so you need to make 750 mls of 0.5 molar solution

Molarity = no of moles per litre, so your new solution needs 0.5M * .75 litres = 0.375 moles (often referred to as gram moles)

You have 16M nitric - ie 16 moles per litre

What volume of that solution will contain 0.375 moles ======>

16M = 0.375 moles / V litres of solution - rearrange to get V = 0.375 / 16 = 0.0234 litres = 23.4 mls - your answer.

You can do everything on a gram basis instead of a number of moles basis, but that just means additional steps of multiplying and dividing by molecular weight (not needed).

OK, does this mean that I can place you as non-American (what with the metric values) - although I am wondering if molarity actually means the same thing in all countries, and can I also deduce that you, Nanobyte are doing Grade 8 or 9 chemistry?