Question

Talc is a mineral with low conductivity for heat and electricity which is not attacked by acid. it is used in talcum powder and face powder. suppose a sample of talc weighs 13.65 g with a density of 1.75 g/cm3 in mineral oil. if this same sample of talc in air weighs 35.97 g, assuming no volume change, what is the density of the talc sample in air?

Answer 1

Answer is: density of the talc sample in air is 4,61 g/cm³.
m(talc) = 13,65 g.
d(talc) = 1,75 g/cm³.
V(talc) = m(talc) ÷ d(talc).
V(talc) = 13,65 g ÷ 1,75 g/cm³.
V(talc) = 7,8 cm³.
d(talc in air) = m(talc in air) ÷ V(talc).
d(talc in air) = 35,97 g ÷ 7,8 cm³.
d(talc in air) = 4,61 g/cm³.