Methane is a colorless gas, and diamond is a hard solid. A methane molecule is made of one carbon atom surrounded by four hydrogen atoms. Diamond is an extended structure made of carbon atoms connected in a repeating pattern. Draw a model of a few methane molecules and a model of the extended structure in diamond. Use your model to explain whether methane and carbon are pure substances, such as compounds or elements, or are mixtures.

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"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"

fe 55.85 g/mol and h2o 18.02 g/mol.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.