Which of the following statements is true about the nucleus?
a) only neutrons hold the nucleus together
b) only the strong nuclear force holds the nucleus together
c) the presence of neutrons , the strong nuclear force , and the residual strong force hold the nucleus together.
d) the strong nuclear force and the residual strong force hold the nucleus together

B) Only the strong nuclear force holds the nucleus together

Explanation:

Nuclei are held together by the Strong nuclear force, this is a force that binds together the protons to the neutrons in the nucleus, the strong nuclear force has a field force the size of the nucleus and then it works as a repulsive force towards the electrons.

"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"

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