A simple Chemistry Question that I cannot get?

kerry

New member
Talc is a mineral that has low conductivity for heat and electricity and that is not attacked by acid. It is used as talcum powder and face powder. A sample of talc weighs 35.97 g in air and 13.65 g in mineral oil (d = 1.75 g/cm3). What is the density of talc?

Answer: 2.82g/cm^3

It seems to be a very simple question but I cannot find that answer (It is confirmed to be correct)
 
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