Up to a point, the elongation of a spring is directly proportional to the force applied to it. once you extend the spring more than 10.0 centimeters, however, it no longer follows that simple linear rule. what force will result in stretching the spring 10.0 centimeters?
a.1.2 newton
b.2.2 newton
c2.5 newton
d.3.5 newton

yes 2.5 is correct for plato!

"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"