Read the list of elements given below. f, cl, br, i. which of the following about the elements is true? a) all of them are highly reactive metals b) all of them are highly reactive non-metals c) f and ci are reactive nonmetals and br and i are highly reactive metals d) f and ci are reactive metals and br and i are highly reactive non metals

The answer is A. All of them are highly reacted metals.

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"

1. they vary with a higher number because boiling is way hotter than melting