Given dry operating mass 5210 zero fuel mass

The formula of hydrated calcium chloride is CaCl₂.XH₂O.

Calculate X if the mass of dry salt is 11.1g and the mass of water in the compound is 3.6g.

First get the mole ratios of CaCl₂ and H₂O

Then divide the ratios by the smallest member to get single integer

11.1/110 :  3.6/18

0.1 : 0.2   or 1 : 2

CaCl₂ . 2H₂O

A 10ml sample of alcohol is pipetted into a flask with stopper. The mass is found by difference to be 7.899g. Calculate the density of the liquid.

Density D =  = 7.899/10 = 0.8g/ml.

One digit.

The mass of an unknown rectangular block is 139.43g. If the block measures 5.00cm by 2.55cm by 1.25cm, what is its density?

Density D =  =  = 8.75g/cm³

What is the meaning of the word sublimation.

Solid changing directly into gas without changing to liquid first.