1. How does a star's life begin?

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Explanation:

A star begins it's life cycle as a nebula, or rather, a cloud of dust and gas! Turbulence deep within these clouds of gas, causes knots to form. The gas and dust begin to collapse under its own gravitational attraction. As the cloud collapses, the material at the centers begins to heat up, forming a protostar!

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ur answer would be b hope i let me know if it is right

"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"