Positions W and X have different surfaces. W has sharp edges, while X has smooth edges. Which experiment will show how limestone can gain different surfaces? A Cover one piece of limestone with soil, and expose another piece to wind and chemicals.
B Use chemical agents on one piece of limestone, and use physical agents on another piece.
C Compress one piece of limestone, and stretch another piece.
D Melt and cool one piece of limestone, and break up and cement another piece.

"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"

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;

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