would you think they were speaking scientifically or quot;new agequot;?
You didn't finish the question, but let's assume that there is a 5.00g rock containing quartz and gold and its density is 3.00 g/cm?. Density of gold = 19.3 g/cm? Density of quartz = 2.65 g/cm? Density of rock = 3.00 g/cm? We can assume that the volumes are additive. The volume of the gold plus the volume of the quartz must equal the volume of the rock. D = m/V. Therefore, V = m/D. 5g / 3.00 g/cm? = x g / 19.3 g/cm? + (5-x) / 2.65 g/cm? x = 0.676 The mass of gold in the rock is 0.676 grams.
