2.5 g of a mixture of calcium carbonate and calcium chloride when mixed with excess dilute hydrochloric acid produced 280 cm of carbon (IV) oxide measured at s. l.p. What is the percentage mass of calcium chloride in the mixture?​

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.