Question

If mass of an empty 8.4 mL pycnometer is 9.4 and the mass of the same pycnometer with an unknown liquid is 18.4. Determine the density of the unknown liquid to the correct number of significant figures in g/mL. ROUND TO TWO DECIMAL PLACES.

Answer 1

The density of any material is caculted by the nex formula:

`\text{density}=(mass)/(volume)`

the volume according to the text is 8.4 ml. The mas we have calculate by difference, the difference of the empty picnometer and the picnometro full with the selected liquid:

mass of the liquid = mass of full picnometer- mass empty picnometer =18.4g-9.4=9g (I asume the mass unit here are in grams since ther is not that info in the text)

then we can calculate the density:

`\text{density}=(mass)/(volume)=(9g)/(8.4ml)=1.07(g)/(ml)`