Bromine, a liquid at room temperature, has a boiling point of 58°c and a melting point of –7.2°c. bromine can be classified as a

Explanation:

A pure substance is defined as the substance that contains same type of atoms or atoms of one type of molecule.

A pure substance will always have a fixed melting and boiling point.

For example, at room temperature bromine is a liquid and its boiling point of and a melting point of .

Hence, bromine is a pure substance.

Whereas when two or more different substances are mixed together irrespective of their ratio by mass then they are known as mixtures. And, mixtures always show a range of temperature for their melting and boiling point.

Hence, bromine is not a mixture.

"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"

answerspecific gravity;