Waiting for answer This question has not been answered yet. You can hire a professional tutor to get the answer.

QUESTION

The density of copper is 8.96 "g/cm"^3". The density of zinc is 7.14 "g/cm"^3". A sample of brass has 70% copper and 30% zinc by mass. What would be the density of this brass sample?

The of the alloy should simply be the weighted average of the individual densities.

So the weighted average:

8.96 g cm^-3 xx 0.7 + 7.14 g cm^-3 xx 0.3 = ??

Note that the property of brass that is prized (apart from the fact that you make horns and tubas out of it) is that the alloy is non-sparking. Given the fact that it doesn't give rise to sparks, it can safely be used in gas fittings (where a spark might be catastrophic!).